{"id":641,"date":"2023-01-12T08:56:08","date_gmt":"2023-01-12T08:56:08","guid":{"rendered":"http:\/\/www.gislxz.com\/?p=641"},"modified":"2023-01-12T08:56:09","modified_gmt":"2023-01-12T08:56:09","slug":"java%e5%9f%ba%e7%a1%80%ef%bc%883","status":"publish","type":"post","link":"https:\/\/www.gislxz.com\/index.php\/2023\/01\/12\/java%e5%9f%ba%e7%a1%80%ef%bc%883\/","title":{"rendered":"Java\u57fa\u7840\uff083)"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">\u4e0d\u53ef\u53d8\u96c6\u5408<\/h2>\n\n\n\n<p>\u4ec0\u4e48\u662f\u4e0d\u53ef\u53d8\u96c6\u5408\uff1f<br>\u4e0d\u53ef\u53d8\u96c6\u5408\uff0c\u5c31\u662f\u4e0d\u53ef\u88ab\u4fee\u6539\u7684\u96c6\u5408\u3002<br>\u96c6\u5408\u7684\u6570\u636e\u9879\u5728\u521b\u5efa\u7684\u65f6\u5019\u63d0\u4f9b\uff0c\u5e76\u4e14\u5728\u6574\u4e2a\u751f\u547d\u5468\u671f\u4e2d\u90fd\u4e0d\u53ef\u6539\u53d8\u3002\u5426\u5219\u62a5\u9519\u3002<br>\u4e3a\u4ec0\u4e48\u8981\u521b\u5efa\u4e0d\u53ef\u53d8\u96c6\u5408\uff1f<br>\u5982\u679c\u67d0\u4e2a\u6570\u636e\u4e0d\u80fd\u88ab\u4fee\u6539\uff0c\u628a\u5b83\u9632\u5fa1\u6027\u5730\u62f7\u8d1d\u5230\u4e0d\u53ef\u53d8\u96c6\u5408\u4e2d\u662f\u4e2a\u5f88\u597d\u7684\u5b9e\u8df5<br>\u6216\u8005\u5f53\u96c6\u5408\u5bf9\u8c61\u88ab\u4e0d\u53ef\u4fe1\u7684\u5e93\u8c03\u7528\u65f6\uff0c\u4e0d\u53ef\u53d8\u5f62\u5f0f\u662f\u5b89\u5168\u7684<br>\u5982\u4f55\u521b\u5efa\u4e0d\u53ef\u53d8\u96c6\u5408\uff1f<br>\u5728List\u3001Set\u3001Map\u63a5\u53e3\u4e2d\uff0c\u90fd\u5b58\u5728of\u65b9\u6cd5\uff0c\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u4e0d\u53ef\u53d8\u7684\u96c6\u5408<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><tbody><tr><td>\u65b9\u6cd5\u540d\u79f0<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>static&nbsp;&lt;E&gt;&nbsp;&nbsp;List&lt;E&gt;&nbsp;&nbsp;of(E\u2026elements)<\/td><td>\u521b\u5efa\u4e00\u4e2a\u5177\u6709\u6307\u5b9a\u5143\u7d20\u7684List\u96c6\u5408\u5bf9\u8c61<\/td><\/tr><tr><td>static&nbsp;&lt;E&gt;&nbsp;&nbsp;Set&lt;E&gt;&nbsp;&nbsp;of(E\u2026elements)<\/td><td>\u521b\u5efa\u4e00\u4e2a\u5177\u6709\u6307\u5b9a\u5143\u7d20\u7684Set\u96c6\u5408\u5bf9\u8c61<\/td><\/tr><tr><td>static&nbsp;&lt;K&nbsp;,&nbsp;V&gt;&nbsp;&nbsp;&nbsp;Map&lt;K\uff0cV&gt;&nbsp;&nbsp;of(E\u2026elements)<\/td><td>\u521b\u5efa\u4e00\u4e2a\u5177\u6709\u6307\u5b9a\u5143\u7d20\u7684Map\u96c6\u5408\u5bf9\u8c61<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<pre class=\"wp-block-code\"><code>\/**\n     \u76ee\u6807\uff1a\u4e0d\u53ef\u53d8\u96c6\u5408\u3002\n *\/\npublic class CollectionDemo {\n    public static void main(String&#91;] args) {\n        \/\/ 1\u3001\u4e0d\u53ef\u53d8\u7684List\u96c6\u5408\n        List&lt;Double&gt; lists = List.of(569.5, 700.5, 523.0,  570.5);\n        \/\/ lists.add(689.0);\n        \/\/ lists.set(2, 698.5);\n        \/\/ System.out.println(lists);\n        double score = lists.get(1);\n        System.out.println(score);\n\n        \/\/ 2\u3001\u4e0d\u53ef\u53d8\u7684Set\u96c6\u5408\n        Set&lt;String&gt; names = Set.of(\"\u8fea\u4e3d\u70ed\u5df4\", \"\u8fea\u4e3d\u70ed\u4e5d\", \"\u9a6c\u5c14\u624e\u54c8\", \"\u5361\u5c14\u7728\u5df4\" );\n        \/\/ names.add(\"\u4e09\u5c11\u7237\");\n        System.out.println(names);\n\n        \/\/ 3\u3001\u4e0d\u53ef\u53d8\u7684Map\u96c6\u5408\n        Map&lt;String, Integer&gt; maps = Map.of(\"huawei\",2, \"Java\u5f00\u53d1\", 1 , \"\u624b\u8868\", 1);\n        \/\/ maps.put(\"\u8863\u670d\", 3);\n        System.out.println(maps);\n    }\n}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Stream\u6d41<\/h2>\n\n\n\n<p>\u5728Java 8\u4e2d\uff0c\u5f97\u76ca\u4e8eLambda\u6240\u5e26\u6765\u7684\u51fd\u6570\u5f0f\u7f16\u7a0b\uff0c \u5f15\u5165\u4e86\u4e00\u4e2a\u5168\u65b0\u7684Stream\u6d41\u6982\u5ff5\u3002<br>\u76ee\u7684\uff1a\u7528\u4e8e\u7b80\u5316\u96c6\u5408\u548c\u6570\u7ec4\u64cd\u4f5c\u7684API<\/p>\n\n\n\n<p>Stream\u6d41\u5f0f\u601d\u60f3\u7684\u6838\u5fc3\uff1a<br>\u5148\u5f97\u5230\u96c6\u5408\u6216\u8005\u6570\u7ec4\u7684Stream\u6d41\uff08\u5c31\u662f\u4e00\u6839\u4f20\u9001\u5e26\uff09<br>\u628a\u5143\u7d20\u653e\u4e0a\u53bb<br>\u7136\u540e\u5c31\u7528\u8fd9\u4e2aStream\u6d41\u7b80\u5316\u7684API\u6765\u65b9\u4fbf\u7684\u64cd\u4f5c\u5143\u7d20<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/**\n   \u76ee\u6807\uff1a\u521d\u6b65\u4f53\u9a8cStream\u6d41\u7684\u65b9\u4fbf\u4e0e\u5feb\u6377Stream\u64cd\u4f5c\u96c6\u5408\u6216\u8005\u6570\u7ec4\u7684\u7b2c\u4e00\u6b65\u662f\u5148\u5f97\u5230Stream\u6d41\uff0c\u7136\u540e\u624d\u80fd\u4f7f\u7528\u6d41\u7684\u529f\u80fd\u3002\n\n *\/\npublic class StreamTest {\n    public static void main(String&#91;] args) {\n        List&lt;String&gt; names = new ArrayList&lt;&gt;();\n        Collections.addAll(names, \"\u5f20\u4e09\u4e30\",\"\u5f20\u65e0\u5fcc\",\"\u5468\u82b7\u82e5\",\"\u8d75\u654f\",\"\u5f20\u5f3a\");\n        System.out.println(names);\n\/\/\n\/\/        \/\/ 1\u3001\u4ece\u96c6\u5408\u4e2d\u627e\u51fa\u59d3\u5f20\u7684\u653e\u5230\u65b0\u96c6\u5408\n\/\/        List&lt;String&gt; zhangList = new ArrayList&lt;&gt;();\n\/\/        for (String name : names) {\n\/\/            if(name.startsWith(\"\u5f20\")){\n\/\/                zhangList.add(name);\n\/\/            }\n\/\/        }\n\/\/        System.out.println(zhangList);\n\/\/\n\/\/        \/\/ 2\u3001\u627e\u540d\u79f0\u957f\u5ea6\u662f3\u7684\u59d3\u540d\n\/\/        List&lt;String&gt; zhangThreeList = new ArrayList&lt;&gt;();\n\/\/        for (String name : zhangList) {\n\/\/            if(name.length() == 3){\n\/\/                zhangThreeList.add(name);\n\/\/            }\n\/\/        }\n\/\/        System.out.println(zhangThreeList);\n\n        \/\/ 3\u3001\u4f7f\u7528Stream\u5b9e\u73b0\u7684\n        names.stream().filter(s -&gt; s.startsWith(\"\u5f20\")).filter(s -&gt; s.length() == 3).forEach(s -&gt; System.out.println(s));\n    }\n}\n bonus +\n                \", punish='\" + punish + '\\'' +\n                '}'+\"\\n\";\n    }\n}<\/code><\/pre>\n\n\n\n<p>Stream\u64cd\u4f5c\u96c6\u5408\u6216\u8005\u6570\u7ec4\u7684\u7b2c\u4e00\u6b65\u662f\u5148\u5f97\u5230Stream\u6d41\uff0c\u7136\u540e\u624d\u80fd\u4f7f\u7528\u6d41\u7684\u529f\u80fd\u3002<br>\u96c6\u5408\u83b7\u53d6Stream\u6d41\u7684\u65b9\u5f0f\uff1a\u53ef\u4ee5\u4f7f\u7528Collection\u63a5\u53e3\u4e2d\u7684\u9ed8\u8ba4\u65b9\u6cd5stream\u200b()\u751f\u6210\u6d41<br>default Stream stream\u200b() \u83b7\u53d6\u5f53\u524d\u96c6\u5408\u5bf9\u8c61\u7684Stream\u6d41<br>public static Stream stream(T[] array) \u83b7\u53d6\u5f53\u524d\u6570\u7ec4\u7684Stream\u6d41<br>public static Stream of(T\u2026 values) \u83b7\u53d6\u5f53\u524d\u6570\u7ec4\/\u53ef\u53d8\u6570\u636e\u7684Stream\u6d41<br>Stream\u6d41\u7684\u4e09\u7c7b\u65b9\u6cd5<br>\u83b7\u53d6Stream\u6d41<br>\u521b\u5efa\u4e00\u6761\u6d41\u6c34\u7ebf\uff0c\u5e76\u628a\u6570\u636e\u653e\u5230\u6d41\u6c34\u7ebf\u4e0a\u51c6\u5907\u8fdb\u884c\u64cd\u4f5c<br>\u4e2d\u95f4\u65b9\u6cd5<br>\u6d41\u6c34\u7ebf\u4e0a\u7684\u64cd\u4f5c\u3002\u4e00\u6b21\u64cd\u4f5c\u5b8c\u6bd5\u4e4b\u540e\uff0c\u8fd8\u53ef\u4ee5\u7ee7\u7eed\u8fdb\u884c\u5176\u4ed6\u64cd\u4f5c\u3002<br>\u7ec8\u7ed3\u65b9\u6cd5<br>\u4e00\u4e2aStream\u6d41\u53ea\u80fd\u6709\u4e00\u4e2a\u7ec8\u7ed3\u65b9\u6cd5\uff0c\u662f\u6d41\u6c34\u7ebf\u4e0a\u7684\u6700\u540e\u4e00\u4e2a\u64cd\u4f5c<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/**\n     \u76ee\u6807\uff1aStream\u6d41\u7684\u83b7\u53d6\n\n     Stream\u6d41\u5f0f\u601d\u60f3\u7684\u6838\u5fc3\uff1a\n                 \u662f\u5148\u5f97\u5230\u96c6\u5408\u6216\u8005\u6570\u7ec4\u7684Stream\u6d41\uff08\u5c31\u662f\u4e00\u6839\u4f20\u9001\u5e26\uff09\n                 \u7136\u540e\u5c31\u7528\u8fd9\u4e2aStream\u6d41\u64cd\u4f5c\u96c6\u5408\u6216\u8005\u6570\u7ec4\u7684\u5143\u7d20\u3002\n                 \u7136\u540e\u7528Stream\u6d41\u7b80\u5316\u66ff\u4ee3\u96c6\u5408\u64cd\u4f5c\u7684API.\n\n     \u96c6\u5408\u83b7\u53d6\u6d41\u7684API:\n         (1) default Stream&lt;E&gt; stream();\n\n     \u5c0f\u7ed3\uff1a\n         \u96c6\u5408\u83b7\u53d6Stream\u6d41\u7528: stream();\n         \u6570\u7ec4\uff1aArrays.stream(\u6570\u7ec4)   \/  Stream.of(\u6570\u7ec4);\n *\/\npublic class StreamDemo02 {\n    public static void main(String&#91;] args) {\n        \/** --------------------Collection\u96c6\u5408\u83b7\u53d6\u6d41-------------------------------   *\/\n        Collection&lt;String&gt; list = new ArrayList&lt;&gt;();\n        Stream&lt;String&gt; s =  list.stream();\n\n        \/** --------------------Map\u96c6\u5408\u83b7\u53d6\u6d41-------------------------------   *\/\n        Map&lt;String, Integer&gt; maps = new HashMap&lt;&gt;();\n        \/\/ \u952e\u6d41\n        Stream&lt;String&gt; keyStream = maps.keySet().stream();\n        \/\/ \u503c\u6d41\n        Stream&lt;Integer&gt; valueStream = maps.values().stream();\n        \/\/ \u952e\u503c\u5bf9\u6d41\uff08\u62ff\u6574\u4f53\uff09\n        Stream&lt;Map.Entry&lt;String,Integer&gt;&gt; keyAndValueStream =  maps.entrySet().stream();\n\n        \/** ---------------------\u6570\u7ec4\u83b7\u53d6\u6d41------------------------------   *\/\n        String&#91;] names = {\"\u8d75\u654f\",\"\u5c0f\u662d\",\"\u706d\u7edd\",\"\u5468\u82b7\u82e5\"};\n        Stream&lt;String&gt; nameStream = Arrays.stream(names);\n        Stream&lt;String&gt; nameStream2 = Stream.of(names);\n    }\n}<\/code><\/pre>\n\n\n\n<p>Stream\u6d41\u7684\u5e38\u7528API(\u4e2d\u95f4\u64cd\u4f5c\u65b9\u6cd5)<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><tbody><tr><td>\u540d\u79f0<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>Stream&lt;T&gt;&nbsp;filter(Predicate&lt;?&nbsp;super&nbsp;T&gt;&nbsp;predicate)<\/td><td>\u7528\u4e8e\u5bf9\u6d41\u4e2d\u7684\u6570\u636e\u8fdb\u884c<strong>\u8fc7\u6ee4\u3002<\/strong><\/td><\/tr><tr><td>Stream&lt;T&gt;&nbsp;limit\u200b(long&nbsp;maxSize)<\/td><td>\u83b7\u53d6\u524d\u51e0\u4e2a\u5143\u7d20<\/td><\/tr><tr><td>Stream&lt;T&gt;&nbsp;skip\u200b(long&nbsp;n)<\/td><td>\u8df3\u8fc7\u524d\u51e0\u4e2a\u5143\u7d20<\/td><\/tr><tr><td>Stream&lt;T&gt;&nbsp;distinct\u200b()<\/td><td>\u53bb\u9664\u6d41\u4e2d\u91cd\u590d\u7684\u5143\u7d20\u3002\u4f9d\u8d56(hashCode\u548cequals\u65b9\u6cd5)<\/td><\/tr><tr><td>static&nbsp;&lt;T&gt;&nbsp;Stream&lt;T&gt;&nbsp;concat\u200b(Stream&nbsp;a,&nbsp;Stream&nbsp;b)<\/td><td><strong>\u5408\u5e76<\/strong>a\u548cb\u4e24\u4e2a\u6d41\u4e3a\u4e00\u4e2a\u6d41<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u6ce8\u610f\uff1a<br>\u4e2d\u95f4\u65b9\u6cd5\u4e5f\u79f0\u4e3a\u975e\u7ec8\u7ed3\u65b9\u6cd5\uff0c\u8c03\u7528\u5b8c\u6210\u540e\u8fd4\u56de\u65b0\u7684Stream\u6d41\u53ef\u4ee5\u7ee7\u7eed\u4f7f\u7528\uff0c\u652f\u6301\u94fe\u5f0f\u7f16\u7a0b\u3002<br>\u5728Stream\u6d41\u4e2d\u65e0\u6cd5\u76f4\u63a5\u4fee\u6539\u96c6\u5408\u3001\u6570\u7ec4\u4e2d\u7684\u6570\u636e\u3002<\/p>\n\n\n\n<p>Stream\u6d41\u7684\u5e38\u89c1\u7ec8\u7ed3\u64cd\u4f5c\u65b9\u6cd5<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><tbody><tr><td>\u540d\u79f0<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>void&nbsp;forEach\u200b(Consumer&nbsp;action)<\/td><td>\u5bf9\u6b64\u6d41\u7684\u6bcf\u4e2a\u5143\u7d20\u6267\u884c\u904d\u5386\u64cd\u4f5c<\/td><\/tr><tr><td>long&nbsp;count\u200b()<\/td><td>\u8fd4\u56de\u6b64\u6d41\u4e2d\u7684\u5143\u7d20\u6570<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u6ce8\u610f\uff1a\u7ec8\u7ed3\u64cd\u4f5c\u65b9\u6cd5\uff0c\u8c03\u7528\u5b8c\u6210\u540e\u6d41\u5c31\u65e0\u6cd5\u7ee7\u7eed\u4f7f\u7528\u4e86\uff0c\u539f\u56e0\u662f\u4e0d\u4f1a\u8fd4\u56deStream\u4e86\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>package com.itheima.d2_stream;\n\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.List;\nimport java.util.function.Consumer;\nimport java.util.function.Function;\nimport java.util.function.Predicate;\nimport java.util.stream.Stream;\n\n\/**\n     \u76ee\u6807\uff1aStream\u6d41\u7684\u5e38\u7528API\n         forEach : \u9010\u4e00\u5904\u7406(\u904d\u5386)\n         count\uff1a\u7edf\u8ba1\u4e2a\u6570\n            -- long count();\n         filter : \u8fc7\u6ee4\u5143\u7d20\n            -- Stream&lt;T&gt; filter(Predicate&lt;? super T&gt; predicate)\n         limit : \u53d6\u524d\u51e0\u4e2a\u5143\u7d20\n         skip : \u8df3\u8fc7\u524d\u51e0\u4e2a\n         map : \u52a0\u5de5\u65b9\u6cd5\n         concat : \u5408\u5e76\u6d41\u3002\n *\/\npublic class StreamDemo03 {\n    public static void main(String&#91;] args) {\n        List&lt;String&gt; list = new ArrayList&lt;&gt;();\n        list.add(\"\u5f20\u65e0\u5fcc\");\n        list.add(\"\u5468\u82b7\u82e5\");\n        list.add(\"\u8d75\u654f\");\n        list.add(\"\u5f20\u5f3a\");\n        list.add(\"\u5f20\u4e09\u4e30\");\n        list.add(\"\u5f20\u4e09\u4e30\");\n\n        \/\/ Stream&lt;T&gt; filter(Predicate&lt;? super T&gt; predicate)\n        list.stream().filter(s -&gt; s.startsWith(\"\u5f20\")).forEach(s -&gt; System.out.println(s));\n\n        long size = list.stream().filter(s -&gt; s.length() == 3).count();\n        System.out.println(size);\n\n       \/\/ list.stream().filter(s -&gt; s.startsWith(\"\u5f20\")).limit(2).forEach(s -&gt; System.out.println(s));\n        list.stream().filter(s -&gt; s.startsWith(\"\u5f20\")).limit(2).forEach(System.out::println);\n\n        list.stream().filter(s -&gt; s.startsWith(\"\u5f20\")).skip(2).forEach(System.out::println);\n\n        \/\/ map\u52a0\u5de5\u65b9\u6cd5: \u7b2c\u4e00\u4e2a\u53c2\u6570\u539f\u6750\u6599  -&gt; \u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u52a0\u5de5\u540e\u7684\u7ed3\u679c\u3002\n        \/\/ \u7ed9\u96c6\u5408\u5143\u7d20\u7684\u524d\u9762\u90fd\u52a0\u4e0a\u4e00\u4e2a\uff1a\u9ed1\u9a6c\u7684\uff1a\n        list.stream().map(s -&gt; \"\u9ed1\u9a6c\u7684\uff1a\" + s).forEach(a -&gt; System.out.println(a));\n\n        \/\/ \u9700\u6c42\uff1a\u628a\u6240\u6709\u7684\u540d\u79f0 \u90fd\u52a0\u5de5\u6210\u4e00\u4e2a\u5b66\u751f\u5bf9\u8c61\u3002\n         list.stream().map(s -&gt; new Student(s)).forEach(s -&gt; System.out.println(s));\n\/\/        list.stream().map(Student::new).forEach(System.out::println); \/\/ \u6784\u9020\u5668\u5f15\u7528  \u65b9\u6cd5\u5f15\u7528\n\n        \/\/ \u5408\u5e76\u6d41\u3002\n        Stream&lt;String&gt; s1 = list.stream().filter(s -&gt; s.startsWith(\"\u5f20\"));\n        Stream&lt;String&gt; s2 = Stream.of(\"java1\", \"java2\");\n        \/\/ public static &lt;T&gt; Stream&lt;T&gt; concat(Stream&lt;? extends T&gt; a, Stream&lt;? extends T&gt; b)\n        Stream&lt;String&gt; s3 = Stream.concat(s1 , s2);\n        s3.distinct().forEach(s -&gt; System.out.println(s));\n    }\n}\n<\/code><\/pre>\n\n\n\n<p>\u6848\u4f8b<br>\u9700\u6c42\uff1a\u67d0\u4e2a\u516c\u53f8\u7684\u5f00\u53d1\u90e8\u95e8\uff0c\u5206\u4e3a\u5f00\u53d1\u4e00\u90e8\u548c\u4e8c\u90e8\uff0c\u73b0\u5728\u9700\u8981\u8fdb\u884c\u5e74\u4e2d\u6570\u636e\u7ed3\u7b97\u3002<br>\u5206\u6790\uff1a<br>\u5458\u5de5\u4fe1\u606f\u81f3\u5c11\u5305\u542b\u4e86(\u540d\u79f0\u3001\u6027\u522b\u3001\u5de5\u8d44\u3001\u5956\u91d1\u3001\u5904\u7f5a\u8bb0\u5f55)<br>\u5f00\u53d1\u4e00\u90e8\u67094\u4e2a\u5458\u5de5\u3001\u5f00\u53d1\u4e8c\u90e8\u67095\u540d\u5458\u5de5<br>\u5206\u522b\u7b5b\u9009\u51fa2\u4e2a\u90e8\u95e8\u7684\u6700\u9ad8\u5de5\u8d44\u7684\u5458\u5de5\u4fe1\u606f\uff0c\u5c01\u88c5\u6210\u4f18\u79c0\u5458\u5de5\u5bf9\u8c61Topperformer<br>\u5206\u522b\u7edf\u8ba1\u51fa2\u4e2a\u90e8\u95e8\u7684\u5e73\u5747\u6708\u6536\u5165\uff0c\u8981\u6c42\u53bb\u6389\u6700\u9ad8\u548c\u6700\u4f4e\u5de5\u8d44\u3002<br>\u7edf\u8ba12\u4e2a\u5f00\u53d1\u90e8\u95e8\u6574\u4f53\u7684\u5e73\u5747\u5de5\u8d44\uff0c\u53bb\u6389\u6700\u4f4e\u548c\u6700\u9ad8\u5de5\u8d44\u7684\u5e73\u5747\u503c\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>package com.itheima.d2_stream;\nimport java.math.BigDecimal;\nimport java.math.RoundingMode;\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.stream.Stream;\npublic class StreamDemo04 {\n    public static double allMoney ;\n    public static double allMoney2 ; \/\/ 2\u4e2a\u90e8\u95e8\u53bb\u6389\u6700\u9ad8\u5de5\u8d44\uff0c\u6700\u4f4e\u5de5\u8d44\u7684\u603b\u548c\n    public static void main(String&#91;] args) {\n        List&lt;Employee&gt; one = new ArrayList&lt;&gt;();\n        one.add(new Employee(\"\u732a\u516b\u6212\",'\u7537',30000 , 25000, null));\n        one.add(new Employee(\"\u5b59\u609f\u7a7a\",'\u7537',25000 , 1000, \"\u9876\u649e\u4e0a\u53f8\"));\n        one.add(new Employee(\"\u6c99\u50e7\",'\u7537',20000 , 20000, null));\n        one.add(new Employee(\"\u5c0f\u767d\u9f99\",'\u7537',20000 , 25000, null));\n\n        List&lt;Employee&gt; two = new ArrayList&lt;&gt;();\n        two.add(new Employee(\"\u6b66\u677e\",'\u7537',15000 , 9000, null));\n        two.add(new Employee(\"\u674e\u9035\",'\u7537',20000 , 10000, null));\n        two.add(new Employee(\"\u897f\u95e8\u5e86\",'\u7537',50000 , 100000, \"\u88ab\u6253\"));\n        two.add(new Employee(\"\u6f58\u91d1\u83b2\",'\u5973',3500 , 1000, \"\u88ab\u6253\"));\n        two.add(new Employee(\"\u6b66\u5927\u90ce\",'\u5973',20000 , 0, \"\u4e0b\u6bd2\"));\n\n        \/\/ 1\u3001\u5f00\u53d1\u4e00\u90e8\u7684\u6700\u9ad8\u5de5\u8d44\u7684\u5458\u5de5\u3002\uff08API\uff09\n        \/\/ \u6307\u5b9a\u5927\u5c0f\u89c4\u5219\u4e86\n\/\/        Employee e = one.stream().max((e1, e2) -&gt; Double.compare(e1.getSalary() + e1.getBonus(),  e2.getSalary() + e2.getBonus()))\n\/\/                .get();\n\/\/       System.out.println(e);\n        Topperformer t = one.stream().max((e1, e2) -&gt; Double.compare(e1.getSalary() + e1.getBonus(),  e2.getSalary() + e2.getBonus()))\n                .map(e -&gt; new Topperformer(e.getName(),  e.getSalary() + e.getBonus())).get();\n        System.out.println(t);\n\n        \/\/ 2\u3001\u7edf\u8ba1\u5e73\u5747\u5de5\u8d44\uff0c\u53bb\u6389\u6700\u9ad8\u5de5\u8d44\u548c\u6700\u4f4e\u5de5\u8d44\n        one.stream().sorted((e1, e2) -&gt; Double.compare(e1.getSalary() + e1.getBonus(),  e2.getSalary() + e2.getBonus()))\n                .skip(1).limit(one.size() - 2).forEach(e -&gt; {\n                    \/\/ \u6c42\u51fa\u603b\u548c\uff1a\u5269\u4f59\u5458\u5de5\u7684\u5de5\u8d44\u603b\u548c\n            allMoney += (e.getSalary() + e.getBonus());\n        });\n        System.out.println(\"\u5f00\u53d1\u4e00\u90e8\u7684\u5e73\u5747\u5de5\u8d44\u662f\uff1a\" + allMoney \/ (one.size() - 2));\n\n        \/\/ 3\u3001\u5408\u5e762\u4e2a\u96c6\u5408\u6d41\uff0c\u518d\u7edf\u8ba1\n        Stream&lt;Employee&gt; s1 = one.stream();\n        Stream&lt;Employee&gt; s2 = two.stream();\n        Stream&lt;Employee&gt; s3 = Stream.concat(s1 , s2);\n        s3.sorted((e1, e2) -&gt; Double.compare(e1.getSalary() + e1.getBonus(),  e2.getSalary() + e2.getBonus()))\n                .skip(1).limit(one.size() + two.size() - 2).forEach(e -&gt; {\n            \/\/ \u6c42\u51fa\u603b\u548c\uff1a\u5269\u4f59\u5458\u5de5\u7684\u5de5\u8d44\u603b\u548c\n            allMoney2 += (e.getSalary() + e.getBonus());\n        });\n\n        \/\/ BigDecimal\n        BigDecimal a = BigDecimal.valueOf(allMoney2);\n        BigDecimal b = BigDecimal.valueOf(one.size()  + two.size() - 2);\n        System.out.println(\"\u5f00\u53d1\u90e8\u7684\u5e73\u5747\u5de5\u8d44\u662f\uff1a\" + a.divide(b,2, RoundingMode.HALF_UP));\n    }\n}\n\npublic class Topperformer {\n    private String name;\n    private double money; \/\/ \u6708\u85aa\n\n    public Topperformer() {\n    }\n\n    public Topperformer(String name, double money) {\n        this.name = name;\n        this.money = money;\n    }\n\n    public String getName() {\n        return name;\n    }\n\n    public void setName(String name) {\n        this.name = name;\n    }\n\n    public double getMoney() {\n        return money;\n    }\n\n    public void setMoney(double money) {\n        this.money = money;\n    }\n\n    @Override\n    public String toString() {\n        return \"Topperformer{\" +\n                \"name='\" + name + '\\'' +\n                \", money=\" + money +\n                '}';\n    }\n}\n<\/code><\/pre>\n\n\n\n<p>\u6536\u96c6Stream\u6d41<\/p>\n\n\n\n<p>\u6536\u96c6Stream\u6d41\u7684\u542b\u4e49\uff1a\u5c31\u662f\u628aStream\u6d41\u64cd\u4f5c\u540e\u7684\u7ed3\u679c\u6570\u636e\u8f6c\u56de\u5230\u96c6\u5408\u6216\u8005\u6570\u7ec4\u4e2d\u53bb\u3002<br>Stream\u6d41\uff1a\u65b9\u4fbf\u64cd\u4f5c\u96c6\u5408\/\u6570\u7ec4\u7684\u624b\u6bb5\u3002<br>\u96c6\u5408\/\u6570\u7ec4\uff1a\u624d\u662f\u5f00\u53d1\u4e2d\u7684\u76ee\u7684\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u540d\u79f0<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>R&nbsp;collect\u200b(Collector&nbsp;collector)<\/td><td>\u5f00\u59cb\u6536\u96c6Stream\u6d41\uff0c\u6307\u5b9a\u6536\u96c6\u5668<\/td><\/tr><\/tbody><\/table><figcaption>Stream\u6d41\u7684\u6536\u96c6\u65b9\u6cd5<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u540d\u79f0<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>public&nbsp;static&nbsp;&lt;T&gt;&nbsp;Collector&nbsp;toList\u200b()<\/td><td>\u628a\u5143\u7d20\u6536\u96c6\u5230List\u96c6\u5408\u4e2d<\/td><\/tr><tr><td>public&nbsp;static&nbsp;&lt;T&gt;&nbsp;Collector&nbsp;toSet\u200b()<\/td><td>\u628a\u5143\u7d20\u6536\u96c6\u5230Set\u96c6\u5408\u4e2d<\/td><\/tr><tr><td>public&nbsp;static&nbsp;&nbsp;Collector&nbsp;toMap\u200b(Function&nbsp;keyMapper&nbsp;,&nbsp;Function&nbsp;valueMapper)<\/td><td>\u628a\u5143\u7d20\u6536\u96c6\u5230Map\u96c6\u5408\u4e2d<\/td><\/tr><\/tbody><\/table><figcaption>Collectors\u5de5\u5177\u7c7b\u63d0\u4f9b\u4e86\u5177\u4f53\u7684\u6536\u96c6\u65b9\u5f0f<\/figcaption><\/figure>\n\n\n\n<pre class=\"wp-block-code\"><code>package com.itheima.d2_stream;\n\nimport java.util.*;\nimport java.util.function.IntFunction;\nimport java.util.stream.Collectors;\nimport java.util.stream.Stream;\n\n\/**\n     \u76ee\u6807\uff1a\u6536\u96c6Stream\u6d41\u7684\u6570\u636e\u5230 \u96c6\u5408\u6216\u8005\u6570\u7ec4\u4e2d\u53bb\u3002\n *\/\npublic class StreamDemo05 {\n    public static void main(String&#91;] args) {\n        List&lt;String&gt; list = new ArrayList&lt;&gt;();\n        list.add(\"\u5f20\u65e0\u5fcc\");\n        list.add(\"\u5468\u82b7\u82e5\");\n        list.add(\"\u8d75\u654f\");\n        list.add(\"\u5f20\u5f3a\");\n        list.add(\"\u5f20\u4e09\u4e30\");\n        list.add(\"\u5f20\u4e09\u4e30\");\n\n        Stream&lt;String&gt; s1 = list.stream().filter(s -&gt; s.startsWith(\"\u5f20\"));\n        List&lt;String&gt; zhangList = s1.collect(Collectors.toList()); \/\/ \u53ef\u53d8\u96c6\u5408\n        zhangList.add(\"java1\");\n        System.out.println(zhangList);\n\n\/\/       List&lt;String&gt; list1 = s1.toList(); \/\/ \u5f97\u5230\u4e0d\u53ef\u53d8\u96c6\u5408\n\/\/       list1.add(\"java\");\n\/\/       System.out.println(list1);\n\n        \/\/ \u6ce8\u610f\u6ce8\u610f\u6ce8\u610f\uff1a\u201c\u6d41\u53ea\u80fd\u4f7f\u7528\u4e00\u6b21\u201d\n        Stream&lt;String&gt; s2 = list.stream().filter(s -&gt; s.startsWith(\"\u5f20\"));\n        Set&lt;String&gt; zhangSet = s2.collect(Collectors.toSet());\n        System.out.println(zhangSet);\n\n        Stream&lt;String&gt; s3 = list.stream().filter(s -&gt; s.startsWith(\"\u5f20\"));\n\/\/         Object&#91;] arrs = s3.toArray();\n        String&#91;] arrs = s3.toArray(String&#91;]::new); \/\/ \u53ef\u4ee5\u4e0d\u7ba1\uff0c\u62d3\u5c55\u4e00\u4e0b\u601d\u7ef4\uff01\uff01\n        System.out.println(\"Arrays\u6570\u7ec4\u5185\u5bb9\uff1a\" + Arrays.toString(arrs));\n\n    }\n}\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u5f02\u5e38<\/h2>\n\n\n\n<p>\u4ec0\u4e48\u662f\u5f02\u5e38\uff1f<br>\u5f02\u5e38\u662f\u7a0b\u5e8f\u5728\u201c\u7f16\u8bd1\u201d\u6216\u8005\u201c\u6267\u884c\u201d\u7684\u8fc7\u7a0b\u4e2d\u53ef\u80fd\u51fa\u73b0\u7684\u95ee\u9898\uff0c\u6ce8\u610f\uff1a\u8bed\u6cd5\u9519\u8bef\u4e0d\u7b97\u5728\u5f02\u5e38\u4f53\u7cfb\u4e2d\u3002<br>\u6bd4\u5982:\u6570\u7ec4\u7d22\u5f15\u8d8a\u754c\u3001\u7a7a\u6307\u9488\u5f02\u5e38\u3001 \u65e5\u671f\u683c\u5f0f\u5316\u5f02\u5e38\uff0c\u7b49\u2026\u000b<\/p>\n\n\n\n<p>\u4e3a\u4ec0\u4e48\u8981\u5b66\u4e60\u5f02\u5e38?<br>\u5f02\u5e38\u4e00\u65e6\u51fa\u73b0\u4e86\uff0c\u5982\u679c\u6ca1\u6709\u63d0\u524d\u5904\u7406\uff0c\u7a0b\u5e8f\u5c31\u4f1a\u9000\u51faJVM\u865a\u62df\u673a\u800c\u7ec8\u6b62.<br>\u7814\u7a76\u5f02\u5e38\u5e76\u4e14\u907f\u514d\u5f02\u5e38\uff0c\u7136\u540e\u63d0\u524d\u5904\u7406\u5f02\u5e38\uff0c\u4f53\u73b0\u7684\u662f\u7a0b\u5e8f\u7684\u5b89\u5168, \u5065\u58ee\u6027\u3002<\/p>\n\n\n\n<p>\u5f02\u5e38\u4f53\u7cfb<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"291\" src=\"https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/1672905997521-1024x291.png\" alt=\"\" class=\"wp-image-645\" srcset=\"https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/1672905997521-1024x291.png 1024w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/1672905997521-300x85.png 300w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/1672905997521-768x219.png 768w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/1672905997521-1536x437.png 1536w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/1672905997521.png 1553w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Error\uff1a\u7cfb\u7edf\u7ea7\u522b\u95ee\u9898\u3001JVM\u9000\u51fa\u7b49\uff0c\u4ee3\u7801\u65e0\u6cd5\u63a7\u5236\u3002<br>Exception\uff1ajava.lang\u5305\u4e0b\uff0c\u79f0\u4e3a\u5f02\u5e38\u7c7b\uff0c\u5b83\u8868\u793a\u7a0b\u5e8f\u672c\u8eab\u53ef\u4ee5\u5904\u7406\u7684\u95ee\u9898<br>RuntimeException\u53ca\u5176\u5b50\u7c7b\uff1a\u8fd0\u884c\u65f6\u5f02\u5e38\uff0c\u7f16\u8bd1\u9636\u6bb5\u4e0d\u4f1a\u62a5\u9519\u3002 (\u7a7a\u6307\u9488\u5f02\u5e38\uff0c\u6570\u7ec4\u7d22\u5f15\u8d8a\u754c\u5f02\u5e38)<br>\u9664RuntimeException\u4e4b\u5916\u6240\u6709\u7684\u5f02\u5e38\uff1a\u7f16\u8bd1\u65f6\u5f02\u5e38\uff0c\u7f16\u8bd1\u671f\u5fc5\u987b\u5904\u7406\u7684\uff0c\u5426\u5219\u7a0b\u5e8f\u4e0d\u80fd\u901a\u8fc7\u7f16\u8bd1\u3002 (\u65e5\u671f\u683c\u5f0f\u5316\u5f02\u5e38)\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"476\" src=\"https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/1672906051583-1024x476.png\" alt=\"\" class=\"wp-image-646\" srcset=\"https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/1672906051583-1024x476.png 1024w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/1672906051583-300x140.png 300w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/1672906051583-768x357.png 768w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/1672906051583-1536x715.png 1536w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/1672906051583.png 1743w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u5e38\u89c1\u7684\u8fd0\u884c\u65f6\u5f02\u5e38<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/**\n    \u62d3\u5c55: \u5e38\u89c1\u7684\u8fd0\u884c\u65f6\u5f02\u5e38\u3002\uff08\u9762\u8bd5\u9898\uff09\n         \u8fd0\u884c\u65f6\u5f02\u5e38\u7684\u6982\u5ff5:\n             \u7ee7\u627f\u81eaRuntimeException\u7684\u5f02\u5e38\u6216\u8005\u5176\u5b50\u7c7b\uff0c\n             \u7f16\u8bd1\u9636\u6bb5\u662f\u4e0d\u4f1a\u51fa\u9519\u7684\uff0c\u5b83\u662f\u5728\u8fd0\u884c\u65f6\u9636\u6bb5\u53ef\u80fd\u51fa\u73b0\u7684\u9519\u8bef\uff0c\n             \u8fd0\u884c\u65f6\u5f02\u5e38\u7f16\u8bd1\u9636\u6bb5\u53ef\u4ee5\u5904\u7406\u4e5f\u53ef\u4ee5\u4e0d\u5904\u7406,\u4ee3\u7801\u7f16\u8bd1\u90fd\u80fd\u901a\u8fc7\uff01\uff01\n\n             1.\u6570\u7ec4\u7d22\u5f15\u8d8a\u754c\u5f02\u5e38: ArrayIndexOutOfBoundsException\u3002\n             2.\u7a7a\u6307\u9488\u5f02\u5e38 : NullPointerException\u3002\n               \u76f4\u63a5\u8f93\u51fa\u6ca1\u6709\u95ee\u9898\u3002\u4f46\u662f\u8c03\u7528\u7a7a\u6307\u9488\u7684\u53d8\u91cf\u7684\u529f\u80fd\u5c31\u4f1a\u62a5\u9519\uff01\uff01\n             3.\u7c7b\u578b\u8f6c\u6362\u5f02\u5e38\uff1aClassCastException\u3002\n             4.\u8fed\u4ee3\u5668\u904d\u5386\u6ca1\u6709\u6b64\u5143\u7d20\u5f02\u5e38\uff1aNoSuchElementException\u3002\n             5.\u6570\u5b66\u64cd\u4f5c\u5f02\u5e38\uff1aArithmeticException\u3002\n             6.\u6570\u5b57\u8f6c\u6362\u5f02\u5e38\uff1a NumberFormatException\u3002\n\n    \u5c0f\u7ed3\uff1a\n        \u8fd0\u884c\u65f6\u5f02\u5e38\u7ee7\u627f\u4e86RuntimeException ,\u7f16\u8bd1\u9636\u6bb5\u4e0d\u62a5\u9519\uff0c\u8fd0\u884c\u65f6\u624d\u53ef\u80fd\u4f1a\u51fa\u73b0\u9519\u8bef!\n *\/\npublic class ExceptionDemo {\n    public static void main(String&#91;] args) {\n        System.out.println(\"\u7a0b\u5e8f\u5f00\u59cb\u3002\u3002\u3002\u3002\u3002\u3002\");\n        \/** 1.\u6570\u7ec4\u7d22\u5f15\u8d8a\u754c\u5f02\u5e38: ArrayIndexOutOfBoundsException\u3002*\/\n        int&#91;] arr = {1, 2, 3};\n        System.out.println(arr&#91;2]);\n        \/\/ System.out.println(arr&#91;3]); \/\/ \u8fd0\u884c\u51fa\u9519\uff0c\u7a0b\u5e8f\u7ec8\u6b62\n\n        \/** 2.\u7a7a\u6307\u9488\u5f02\u5e38 : NullPointerException\u3002\u76f4\u63a5\u8f93\u51fa\u6ca1\u6709\u95ee\u9898\u3002\u4f46\u662f\u8c03\u7528\u7a7a\u6307\u9488\u7684\u53d8\u91cf\u7684\u529f\u80fd\u5c31\u4f1a\u62a5\u9519\uff01\uff01 *\/\n        String name = null;\n        System.out.println(name); \/\/ null\n        \/\/ System.out.println(name.length()); \/\/ \u8fd0\u884c\u51fa\u9519\uff0c\u7a0b\u5e8f\u7ec8\u6b62\n\n        \/** 3.\u7c7b\u578b\u8f6c\u6362\u5f02\u5e38\uff1aClassCastException\u3002 *\/\n        Object o = 23;\n        \/\/ String s = (String) o;  \/\/ \u8fd0\u884c\u51fa\u9519\uff0c\u7a0b\u5e8f\u7ec8\u6b62\n\n        \/** 5.\u6570\u5b66\u64cd\u4f5c\u5f02\u5e38\uff1aArithmeticException\u3002 *\/\n        \/\/int c = 10 \/ 0;\n\n        \/** 6.\u6570\u5b57\u8f6c\u6362\u5f02\u5e38\uff1a NumberFormatException\u3002 *\/\n        \/\/String number = \"23\";\n        String number = \"23aabbc\";\n        Integer it = Integer.valueOf(number); \/\/ \u8fd0\u884c\u51fa\u9519\uff0c\u7a0b\u5e8f\u7ec8\u6b62\n        System.out.println(it + 1);\n\n        System.out.println(\"\u7a0b\u5e8f\u7ed3\u675f\u3002\u3002\u3002\u3002\u3002\");\n\n    }\n}<\/code><\/pre>\n\n\n\n<p>\u5e38\u89c1\u7684\u7f16\u8bd1\u65f6\u5f02\u5e38<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/**\n    \u76ee\u6807\uff1a\u5e38\u89c1\u7684\u7f16\u8bd1\u65f6\u5f02\u5e38\u8ba4\u8bc6\u3002\n\n    \u7f16\u8bd1\u65f6\u5f02\u5e38\uff1a\u7ee7\u627f\u81eaException\u7684\u5f02\u5e38\u6216\u8005\u5176\u5b50\u7c7b\uff0c\u6ca1\u6709\u7ee7\u627fRuntimeException\n         \"\u7f16\u8bd1\u65f6\u5f02\u5e38\u662f\u7f16\u8bd1\u9636\u6bb5\u5c31\u4f1a\u62a5\u9519\"\uff0c\n         \u5fc5\u987b\u7a0b\u5e8f\u5458\u7f16\u8bd1\u9636\u6bb5\u5c31\u5904\u7406\u7684\u3002\u5426\u5219\u4ee3\u7801\u7f16\u8bd1\u5c31\u62a5\u9519\uff01\uff01\n\n    \u7f16\u8bd1\u65f6\u5f02\u5e38\u7684\u4f5c\u7528\u662f\u4ec0\u4e48\uff1a\n         \u662f\u62c5\u5fc3\u7a0b\u5e8f\u5458\u7684\u6280\u672f\u4e0d\u884c\uff0c\u5728\u7f16\u8bd1\u9636\u6bb5\u5c31\u7206\u51fa\u4e00\u4e2a\u9519\u8bef, \u76ee\u7684\u5728\u4e8e\u63d0\u9192!\n         \u63d0\u9192\u7a0b\u5e8f\u5458\u8fd9\u91cc\u5f88\u53ef\u80fd\u51fa\u9519\uff0c\u8bf7\u68c0\u67e5\u5e76\u6ce8\u610f\u4e0d\u8981\u51fabug\u3002\n         \u7f16\u8bd1\u65f6\u5f02\u5e38\u662f\u53ef\u9047\u4e0d\u53ef\u6c42\u3002\u9047\u5230\u4e86\u5c31\u9047\u5230\u4e86\u5457\u3002\n\n    \u4e86\u89e3: \n *\/\npublic class ExceptionDemo {\n    public static void main(String&#91;] args) throws ParseException {\n        String date = \"2015-01-12 10:23:21\";\n        \/\/ \u521b\u5efa\u4e00\u4e2a\u7b80\u5355\u65e5\u671f\u683c\u5f0f\u5316\u7c7b\uff1a\n        SimpleDateFormat sdf = new SimpleDateFormat(\"yyyy\/MM-dd HH:mm:ss\");\n        \/\/ \u89e3\u6790\u5b57\u7b26\u4e32\u65f6\u95f4\u6210\u4e3a\u65e5\u671f\u5bf9\u8c61\n        Date d = sdf.parse(date);\n        \/\/\n        System.out.println(d);\n    }\n}\n<\/code><\/pre>\n\n\n\n<p>\u5f02\u5e38\u7684\u4ea7\u751f\u9ed8\u8ba4\u7684\u5904\u7406\u8fc7\u7a0b\u89e3\u6790<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/**\n     \u76ee\u6807\uff1a\u5f02\u5e38\u7684\u4ea7\u751f\u9ed8\u8ba4\u7684\u5904\u7406\u8fc7\u7a0b\u89e3\u6790\u3002(\u81ea\u52a8\u5904\u7406\u7684\u8fc7\u7a0b\uff01)\n    \uff081\uff09\u9ed8\u8ba4\u4f1a\u5728\u51fa\u73b0\u5f02\u5e38\u7684\u4ee3\u7801\u90a3\u91cc\u81ea\u52a8\u7684\u521b\u5efa\u4e00\u4e2a\u5f02\u5e38\u5bf9\u8c61\uff1aArithmeticException\u3002\n    \uff082\uff09\u5f02\u5e38\u4f1a\u4ece\u65b9\u6cd5\u4e2d\u51fa\u73b0\u7684\u70b9\u8fd9\u91cc\u629b\u51fa\u7ed9\u8c03\u7528\u8005\uff0c\u8c03\u7528\u8005\u6700\u7ec8\u629b\u51fa\u7ed9JVM\u865a\u62df\u673a\u3002\n    \uff083\uff09\u865a\u62df\u673a\u63a5\u6536\u5230\u5f02\u5e38\u5bf9\u8c61\u540e\uff0c\u5148\u5728\u63a7\u5236\u53f0\u76f4\u63a5\u8f93\u51fa\u5f02\u5e38\u6808\u4fe1\u606f\u6570\u636e\u3002\n    \uff084\uff09\u76f4\u63a5\u4ece\u5f53\u524d\u6267\u884c\u7684\u5f02\u5e38\u70b9\u5e72\u6389\u5f53\u524d\u7a0b\u5e8f\u3002\n    \uff085\uff09\u540e\u7eed\u4ee3\u7801\u6ca1\u6709\u673a\u4f1a\u6267\u884c\u4e86\uff0c\u56e0\u4e3a\u7a0b\u5e8f\u5df2\u7ecf\u6b7b\u4ea1\u3002\n\n    \u5c0f\u7ed3\uff1a\n         \u5f02\u5e38\u4e00\u65e6\u51fa\u73b0\uff0c\u4f1a\u81ea\u52a8\u521b\u5efa\u5f02\u5e38\u5bf9\u8c61\uff0c\u6700\u7ec8\u629b\u51fa\u7ed9\u865a\u62df\u673a\uff0c\u865a\u62df\u673a\n         \u53ea\u8981\u6536\u5230\u5f02\u5e38\uff0c\u5c31\u76f4\u63a5\u8f93\u51fa\u5f02\u5e38\u4fe1\u606f\uff0c\u5e72\u6389\u7a0b\u5e8f\uff01\uff01\n\n         \u9ed8\u8ba4\u7684\u5f02\u5e38\u5904\u7406\u673a\u5236\u5e76\u4e0d\u597d\uff0c\u4e00\u65e6\u771f\u7684\u51fa\u73b0\u5f02\u5e38\uff0c\u7a0b\u5e8f\u7acb\u5373\u6b7b\u4ea1\uff01\n *\/\npublic class ExceptionDemo {\n    public static void main(String&#91;] args) {\n        System.out.println(\"\u7a0b\u5e8f\u5f00\u59cb\u3002\u3002\u3002\u3002\u3002\u3002\u3002\u3002\u3002\u3002\");\n        chu(10, 0);\n        System.out.println(\"\u7a0b\u5e8f\u7ed3\u675f\u3002\u3002\u3002\u3002\u3002\u3002\u3002\u3002\u3002\u3002\");\n    }\n\n    public static void chu(int a , int b){\n        System.out.println(a);\n        System.out.println(b);\n        int c = a \/ b;\n        System.out.println(c);\n    }\n}<\/code><\/pre>\n\n\n\n<p>\u7f16\u8bd1\u65f6\u5f02\u5e38\u662f\u7f16\u8bd1\u9636\u6bb5\u5c31\u51fa\u9519\u7684\uff0c\u6240\u4ee5\u5fc5\u987b\u5904\u7406\uff0c\u5426\u5219\u4ee3\u7801\u6839\u672c\u65e0\u6cd5\u901a\u8fc7<br>\u7f16\u8bd1\u65f6\u5f02\u5e38\u7684\u5904\u7406\u5f62\u5f0f\u6709\u4e09\u79cd\uff1a<br>\u51fa\u73b0\u5f02\u5e38\u76f4\u63a5\u629b\u51fa\u53bb\u7ed9\u8c03\u7528\u8005\uff0c\u8c03\u7528\u8005\u4e5f\u7ee7\u7eed\u629b\u51fa\u53bb\u3002<br>\u51fa\u73b0\u5f02\u5e38\u81ea\u5df1\u6355\u83b7\u5904\u7406\uff0c\u4e0d\u9ebb\u70e6\u522b\u4eba\u3002<br>\u524d\u4e24\u8005\u7ed3\u5408\uff0c\u51fa\u73b0\u5f02\u5e38\u76f4\u63a5\u629b\u51fa\u53bb\u7ed9\u8c03\u7528\u8005\uff0c\u8c03\u7528\u8005\u6355\u83b7\u5904\u7406\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>package com.itheima.d7_exception_handle;\n\nimport java.io.FileInputStream;\nimport java.io.FileNotFoundException;\nimport java.io.InputStream;\nimport java.text.ParseException;\nimport java.text.SimpleDateFormat;\nimport java.util.Date;\n\n\/**\n    \u76ee\u6807\uff1a\u7f16\u8bd1\u65f6\u5f02\u5e38\u7684\u5904\u7406\u65b9\u5f0f\u4e00\u3002\n\n    \u7f16\u8bd1\u65f6\u5f02\u5e38\uff1a\u7f16\u8bd1\u9636\u6bb5\u5c31\u4f1a\u62a5\u9519\uff0c\u4e00\u5b9a\u9700\u8981\u7a0b\u5e8f\u5458\u5904\u7406\u7684\uff0c\u5426\u5219\u4ee3\u7801\u65e0\u6cd5\u901a\u8fc7\uff01\uff01\n\n    \u629b\u51fa\u5f02\u5e38\u683c\u5f0f\uff1a\n        \u65b9\u6cd5 throws \u5f02\u5e381 ,  \u5f02\u5e382 , ..{\n\n        }\n        \u5efa\u8bae\u629b\u51fa\u5f02\u5e38\u7684\u65b9\u5f0f\uff1a\u4ee3\u8868\u53ef\u4ee5\u629b\u51fa\u4e00\u5207\u5f02\u5e38\uff0c\n        \u65b9\u6cd5 throws Exception{\n\n        }\n\n    \u65b9\u5f0f\u4e00\uff1a\n        \u5728\u51fa\u73b0\u7f16\u8bd1\u65f6\u5f02\u5e38\u7684\u5730\u65b9\u5c42\u5c42\u628a\u5f02\u5e38\u629b\u51fa\u53bb\u7ed9\u8c03\u7528\u8005\uff0c\u8c03\u7528\u8005\u6700\u7ec8\u629b\u51fa\u7ed9JVM\u865a\u62df\u673a\u3002\n        JVM\u865a\u62df\u673a\u8f93\u51fa\u5f02\u5e38\u4fe1\u606f\uff0c\u76f4\u63a5\u5e72\u6389\u7a0b\u5e8f\uff0c\u8fd9\u79cd\u65b9\u5f0f\u4e0e\u9ed8\u8ba4\u65b9\u5f0f\u662f\u4e00\u6837\u7684\u3002\n        \u867d\u7136\u53ef\u4ee5\u89e3\u51b3\u4ee3\u7801\u7f16\u8bd1\u65f6\u7684\u9519\u8bef\uff0c\u4f46\u662f\u4e00\u65e6\u8fd0\u884c\u65f6\u771f\u7684\u51fa\u73b0\u5f02\u5e38\uff0c\u7a0b\u5e8f\u8fd8\u662f\u4f1a\u7acb\u5373\u6b7b\u4ea1\uff01\n        \u8fd9\u79cd\u65b9\u5f0f\u5e76\u4e0d\u597d!\n\n    \u5c0f\u7ed3\uff1a\n        \u65b9\u5f0f\u4e00\u51fa\u73b0\u5f02\u5e38\u5c42\u5c42\u8dd1\u51fa\u7ed9\u865a\u62df\u673a\uff0c\u6700\u7ec8\u7a0b\u5e8f\u5982\u679c\u771f\u7684\u51fa\u73b0\u5f02\u5e38\uff0c\u7a0b\u5e8f\u8fd8\u662f\u7acb\u5373\u6b7b\u4ea1\uff01\u8fd9\u79cd\u65b9\u5f0f\u4e0d\u597d\uff01\n\n *\/\npublic class ExceptionDemo01 {\n\n\/\/    public static void main(String&#91;] args) throws ParseException, FileNotFoundException {\n\/\/        System.out.println(\"\u7a0b\u5e8f\u5f00\u59cb\u3002\u3002\u3002\u3002\u3002\");\n\/\/        parseTime(\"2011-11-11 11:11:11\");\n\/\/        System.out.println(\"\u7a0b\u5e8f\u7ed3\u675f\u3002\u3002\u3002\u3002\u3002\");\n\/\/    }\n\/\/\n\/\/    public static void parseTime(String date) throws ParseException, FileNotFoundException {\n\/\/        SimpleDateFormat sdf = new SimpleDateFormat(\"yyyy\/MM-dd HH:mm:ss\");\n\/\/        Date d = sdf.parse(date);\n\/\/        System.out.println(d);\n\/\/\n\/\/        InputStream is = new FileInputStream(\"E:\/meinv.jpg\");\n\/\/    }\n\n    public static void main(String&#91;] args) throws Exception {\n        System.out.println(\"\u7a0b\u5e8f\u5f00\u59cb\u3002\u3002\u3002\u3002\u3002\");\n        parseTime(\"2011-11-11 11:11:11\");\n        System.out.println(\"\u7a0b\u5e8f\u7ed3\u675f\u3002\u3002\u3002\u3002\u3002\");\n    }\n\n    public static void parseTime(String date) throws Exception {\n        SimpleDateFormat sdf = new SimpleDateFormat(\"yyyy-MM-dd HH:mm:ss\");\n        Date d = sdf.parse(date);\n        System.out.println(d);\n\n        InputStream is = new FileInputStream(\"E:\/meinv.jpg\");\n    }\n\n}\n\npackage com.itheima.d7_exception_handle;\n\nimport java.io.FileInputStream;\nimport java.io.FileNotFoundException;\nimport java.io.InputStream;\nimport java.text.ParseException;\nimport java.text.SimpleDateFormat;\nimport java.util.Date;\n\n\/**\n    \u76ee\u6807\uff1a\u7f16\u8bd1\u65f6\u5f02\u5e38\u7684\u5904\u7406\u65b9\u5f0f\u4e8c\u3002\n\n    \u65b9\u5f0f\u4e8c\uff1a\u5728\u51fa\u73b0\u5f02\u5e38\u7684\u5730\u65b9\u81ea\u5df1\u5904\u7406\uff0c\u8c01\u51fa\u73b0\u8c01\u5904\u7406\u3002\n\n    \u81ea\u5df1\u6355\u83b7\u5f02\u5e38\u548c\u5904\u7406\u5f02\u5e38\u7684\u683c\u5f0f\uff1a\u6355\u83b7\u5904\u7406\n         try{\n            \/\/ \u76d1\u89c6\u53ef\u80fd\u51fa\u73b0\u5f02\u5e38\u7684\u4ee3\u7801\uff01\n         }catch(\u5f02\u5e38\u7c7b\u578b1 \u53d8\u91cf){\n            \/\/ \u5904\u7406\u5f02\u5e38\n         }catch(\u5f02\u5e38\u7c7b\u578b2 \u53d8\u91cf){\n            \/\/ \u5904\u7406\u5f02\u5e38\n         }...\n\n    \u76d1\u89c6\u6355\u83b7\u5904\u7406\u5f02\u5e38\u4f01\u4e1a\u7ea7\u5199\u6cd5\uff1a\n         try{\n             \/\/ \u53ef\u80fd\u51fa\u73b0\u5f02\u5e38\u7684\u4ee3\u7801\uff01\n         }catch (Exception e){\n            e.printStackTrace(); \/\/ \u76f4\u63a5\u6253\u5370\u5f02\u5e38\u6808\u4fe1\u606f\n         }\n         Exception\u53ef\u4ee5\u6355\u83b7\u5904\u7406\u4e00\u5207\u5f02\u5e38\u7c7b\u578b\uff01\n\n    \u5c0f\u7ed3\uff1a\n        \u7b2c\u4e8c\u79cd\u65b9\u5f0f\uff0c\u53ef\u4ee5\u5904\u7406\u5f02\u5e38\uff0c\u5e76\u4e14\u51fa\u73b0\u5f02\u5e38\u540e\u4ee3\u7801\u4e5f\u4e0d\u4f1a\u6b7b\u4ea1\u3002\n        \u8fd9\u79cd\u65b9\u6848\u8fd8\u662f\u53ef\u4ee5\u7684\u3002\n        \u4f46\u662f\u4ece\u7406\u8bba\u4e0a\u6765\u8bf4\uff0c\u8fd9\u79cd\u65b9\u5f0f\u4e0d\u662f\u6700\u597d\u7684\uff0c\u4e0a\u5c42\u8c03\u7528\u8005\u4e0d\u80fd\u76f4\u63a5\u77e5\u9053\u5e95\u5c42\u7684\u6267\u884c\u60c5\u51b5\uff01\n\n *\/\npublic class ExceptionDemo02 {\n    public static void main(String&#91;] args) {\n        System.out.println(\"\u7a0b\u5e8f\u5f00\u59cb\u3002\u3002\u3002\u3002\");\n        parseTime(\"2011-11-11 11:11:11\");\n        System.out.println(\"\u7a0b\u5e8f\u7ed3\u675f\u3002\u3002\u3002\u3002\");\n    }\n\n    public static void parseTime(String date) {\n        try {\n            SimpleDateFormat sdf = new SimpleDateFormat(\"yyyy\/MM-dd HH:mm:ss\");\n            Date d = sdf.parse(date);\n            System.out.println(d);\n\n            InputStream is = new FileInputStream(\"E:\/meinv.jpg\");\n        } catch (Exception e) {\n            e.printStackTrace(); \/\/ \u6253\u5370\u5f02\u5e38\u6808\u4fe1\u606f\n        }\n    }\n\n\n\/\/    public static void parseTime(String date) {\n\/\/        try {\n\/\/            SimpleDateFormat sdf = new SimpleDateFormat(\"yyyy\/MM-dd HH:mm:ss\");\n\/\/            Date d = sdf.parse(date);\n\/\/            System.out.println(d);\n\/\/\n\/\/            InputStream is = new FileInputStream(\"E:\/meinv.jpg\");\n\/\/        } catch (FileNotFoundException|ParseException e) {\n\/\/            e.printStackTrace(); \/\/ \u6253\u5370\u5f02\u5e38\u6808\u4fe1\u606f\n\/\/        }\n\/\/    }\n\n\/\/    public static void parseTime(String date) {\n\/\/        try {\n\/\/            SimpleDateFormat sdf = new SimpleDateFormat(\"yyyy\/MM-dd HH:mm:ss\");\n\/\/            Date d = sdf.parse(date);\n\/\/            System.out.println(d);\n\/\/\n\/\/            InputStream is = new FileInputStream(\"E:\/meinv.jpg\");\n\/\/        } catch (FileNotFoundException e) {\n\/\/           e.printStackTrace(); \/\/ \u6253\u5370\u5f02\u5e38\u6808\u4fe1\u606f\n\/\/        } catch (ParseException e) {\n\/\/           e.printStackTrace();\n\/\/        }\n\/\/    }\n\n\/\/    public static void parseTime(String date) {\n\/\/        try {\n\/\/            SimpleDateFormat sdf = new SimpleDateFormat(\"yyyy\/MM-dd HH:mm:ss\");\n\/\/            Date d = sdf.parse(date);\n\/\/            System.out.println(d);\n\/\/        } catch (ParseException e) {\n\/\/            \/\/ \u89e3\u6790\u51fa\u73b0\u95ee\u9898\n\/\/            System.out.println(\"\u51fa\u73b0\u4e86\u89e3\u6790\u65f6\u95f4\u5f02\u5e38\u54e6\uff0c\u8d70\u70b9\u5fc3\uff01\uff01\");\n\/\/        }\n\/\/\n\/\/        try {\n\/\/            InputStream is = new FileInputStream(\"E:\/meinv.jpg\");\n\/\/        } catch (FileNotFoundException e) {\n\/\/            System.out.println(\"\u60a8\u7684\u6587\u4ef6\u6839\u672c\u5c31\u6ca1\u6709\u554a\uff0c\u4e0d\u8981\u9a97\u6211\u54e6\uff01\uff01\");\n\/\/        }\n\/\/    }\n}\n\npackage com.itheima.d7_exception_handle;\n\nimport java.io.FileInputStream;\nimport java.io.InputStream;\nimport java.text.ParseException;\nimport java.text.SimpleDateFormat;\nimport java.util.Date;\n\n\/**\n    \u76ee\u6807\uff1a\u7f16\u8bd1\u65f6\u5f02\u5e38\u7684\u5904\u7406\u65b9\u5f0f\u4e09\u3002\n\n    \u65b9\u5f0f\u4e09\uff1a \u5728\u51fa\u73b0\u5f02\u5e38\u7684\u5730\u65b9\u628a\u5f02\u5e38\u4e00\u5c42\u4e00\u5c42\u7684\u629b\u51fa\u7ed9\u6700\u5916\u5c42\u8c03\u7528\u8005\uff0c\n            \u6700\u5916\u5c42\u8c03\u7528\u8005\u96c6\u4e2d\u6355\u83b7\u5904\u7406\uff01\uff01\uff08\u89c4\u8303\u505a\u6cd5\uff09\n\n    \u5c0f\u7ed3\uff1a\n        \u7f16\u8bd1\u65f6\u5f02\u5e38\u7684\u5904\u7406\u65b9\u5f0f\u4e09\uff1a\u5e95\u5c42\u51fa\u73b0\u7684\u5f02\u5e38\u629b\u51fa\u7ed9\u6700\u5916\u5c42\u8c03\u7528\u8005\u96c6\u4e2d\u6355\u83b7\u5904\u7406\u3002\n        \u8fd9\u79cd\u65b9\u6848\u6700\u5916\u5c42\u8c03\u7528\u8005\u53ef\u4ee5\u77e5\u9053\u5e95\u5c42\u6267\u884c\u7684\u60c5\u51b5\uff0c\u540c\u65f6\u7a0b\u5e8f\u5728\u51fa\u73b0\u5f02\u5e38\u540e\u4e5f\u4e0d\u4f1a\u7acb\u5373\u6b7b\u4ea1\uff0c\u8fd9\u662f\n        \u7406\u8bba\u4e0a\u6700\u597d\u7684\u65b9\u6848\u3002\n\n        \u867d\u7136\u5f02\u5e38\u6709\u4e09\u79cd\u5904\u7406\u65b9\u5f0f\uff0c\u4f46\u662f\u5f00\u53d1\u4e2d\u53ea\u8981\u80fd\u89e3\u51b3\u4f60\u7684\u95ee\u9898\uff0c\u6bcf\u79cd\u65b9\u5f0f\u90fd\u53c8\u53ef\u80fd\u7528\u5230!!\n *\/\npublic class ExceptionDemo03 {\n    public static void main(String&#91;] args) {\n        System.out.println(\"\u7a0b\u5e8f\u5f00\u59cb\u3002\u3002\u3002\u3002\");\n        try {\n            parseTime(\"2011-11-11 11:11:11\");\n            System.out.println(\"\u529f\u80fd\u64cd\u4f5c\u6210\u529f~~~\");\n        } catch (Exception e) {\n            e.printStackTrace();\n            System.out.println(\"\u529f\u80fd\u64cd\u4f5c\u5931\u8d25~~~\");\n        }\n        System.out.println(\"\u7a0b\u5e8f\u7ed3\u675f\u3002\u3002\u3002\u3002\");\n    }\n\n    public static void parseTime(String date) throws Exception {\n        SimpleDateFormat sdf = new SimpleDateFormat(\"yyyy\u3001MM-dd HH:mm:ss\");\n        Date d = sdf.parse(date);\n        System.out.println(d);\n\n        InputStream is = new FileInputStream(\"D:\/meinv.jpg\");\n    }\n\n}\n<\/code><\/pre>\n\n\n\n<p>\u8fd0\u884c\u65f6\u5f02\u5e38\u7684\u5904\u7406\u5f62\u5f0f<br>\u8fd0\u884c\u65f6\u5f02\u5e38\u7f16\u8bd1\u9636\u6bb5\u4e0d\u4f1a\u51fa\u9519\uff0c\u662f\u8fd0\u884c\u65f6\u624d\u53ef\u80fd\u51fa\u9519\u7684\uff0c\u6240\u4ee5\u7f16\u8bd1\u9636\u6bb5\u4e0d\u5904\u7406\u4e5f\u53ef\u4ee5\u3002<br>\u6309\u7167\u89c4\u8303\u5efa\u8bae\u8fd8\u662f\u5904\u7406\uff1a\u5efa\u8bae\u5728\u6700\u5916\u5c42\u8c03\u7528\u5904\u96c6\u4e2d\u6355\u83b7\u5904\u7406\u5373\u53ef\u3002<\/p>\n\n\n\n<p>\u5f02\u5e38\u5904\u7406\u4f7f\u4ee3\u7801\u66f4\u7a33\u5065\u7684\u6848\u4f8b<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.util.Scanner;\n\n\/**\n    \u9700\u6c42\uff1a\u9700\u8981\u8f93\u5165\u4e00\u4e2a\u5408\u6cd5\u7684\u4ef7\u683c\u4e3a\u6b62 \u8981\u6c42\u4ef7\u683c\u5927\u4e8e 0\n *\/\npublic class Test2 {\n    public static void main(String&#91;] args) {\n        Scanner sc  = new Scanner(System.in);\n        while (true) {\n            try {\n                System.out.println(\"\u8bf7\u60a8\u8f93\u5165\u5408\u6cd5\u7684\u4ef7\u683c\uff1a\");\n                String priceStr = sc.nextLine();\n                \/\/ \u8f6c\u6362\u6210double\u7c7b\u578b\u7684\u4ef7\u683c\n                double price = Double.valueOf(priceStr);\n\n                \/\/ \u5224\u65ad\u4ef7\u683c\u662f\u5426\u5927\u4e8e 0\n                if(price &gt; 0) {\n                    System.out.println(\"\u5b9a\u4ef7\uff1a\" + price);\n                    break;\n                }else {\n                    System.out.println(\"\u4ef7\u683c\u5fc5\u987b\u662f\u6b63\u6570~~~\");\n                }\n            } catch (Exception e) {\n                System.out.println(\"\u7528\u6237\u8f93\u5165\u7684\u6570\u636e\u6709\u6bdb\u75c5\uff0c\u8bf7\u60a8\u8f93\u5165\u5408\u6cd5\u7684\u6570\u503c\uff0c\u5efa\u8bae\u4e3a\u6b63\u6570~~\");\n            }\n        }\n    }\n}<\/code><\/pre>\n\n\n\n<p>\u81ea\u5b9a\u4e49\u5f02\u5e38 <\/p>\n\n\n\n<p>\u81ea\u5b9a\u4e49\u5f02\u5e38\u7684\u5fc5\u8981\uff1f<br>Java\u65e0\u6cd5\u4e3a\u8fd9\u4e2a\u4e16\u754c\u4e0a\u5168\u90e8\u7684\u95ee\u9898\u63d0\u4f9b\u5f02\u5e38\u7c7b\u3002<br>\u5982\u679c\u4f01\u4e1a\u60f3\u901a\u8fc7\u5f02\u5e38\u7684\u65b9\u5f0f\u6765\u7ba1\u7406\u81ea\u5df1\u7684\u67d0\u4e2a\u4e1a\u52a1\u95ee\u9898\uff0c\u5c31\u9700\u8981\u81ea\u5b9a\u4e49\u5f02\u5e38\u7c7b\u4e86\u3002<br>\u81ea\u5b9a\u4e49\u5f02\u5e38\u7684\u597d\u5904\uff1a<br>\u53ef\u4ee5\u4f7f\u7528\u5f02\u5e38\u7684\u673a\u5236\u7ba1\u7406\u4e1a\u52a1\u95ee\u9898\uff0c\u5982\u63d0\u9192\u7a0b\u5e8f\u5458\u6ce8\u610f\u3002<br>\u540c\u65f6\u4e00\u65e6\u51fa\u73b0bug\uff0c\u53ef\u4ee5\u7528\u5f02\u5e38\u7684\u5f62\u5f0f\u6e05\u6670\u7684\u6307\u51fa\u51fa\u9519\u7684\u5730\u65b9\u3002<\/p>\n\n\n\n<p>\u81ea\u5b9a\u4e49\u5f02\u5e38\u7684\u5206\u7c7b<br>1\u3001\u81ea\u5b9a\u4e49\u7f16\u8bd1\u65f6\u5f02\u5e38<br>\u5b9a\u4e49\u4e00\u4e2a\u5f02\u5e38\u7c7b\u7ee7\u627fException.<br>\u91cd\u5199\u6784\u9020\u5668\u3002<br>\u5728\u51fa\u73b0\u5f02\u5e38\u7684\u5730\u65b9\u7528throw new \u81ea\u5b9a\u4e49\u5bf9\u8c61\u629b\u51fa\uff0c<br>\u4f5c\u7528\uff1a\u7f16\u8bd1\u65f6\u5f02\u5e38\u662f\u7f16\u8bd1\u9636\u6bb5\u5c31\u62a5\u9519\uff0c\u63d0\u9192\u66f4\u52a0\u5f3a\u70c8\uff0c\u4e00\u5b9a\u9700\u8981\u5904\u7406\uff01\uff01<br>2\u3001\u81ea\u5b9a\u4e49\u8fd0\u884c\u65f6\u5f02\u5e38<br>\u5b9a\u4e49\u4e00\u4e2a\u5f02\u5e38\u7c7b\u7ee7\u627fRuntimeException.<br>\u91cd\u5199\u6784\u9020\u5668\u3002<br>\u5728\u51fa\u73b0\u5f02\u5e38\u7684\u5730\u65b9\u7528throw new \u81ea\u5b9a\u4e49\u5bf9\u8c61\u629b\u51fa!<br>\u4f5c\u7528\uff1a\u63d0\u9192\u4e0d\u5f3a\u70c8\uff0c\u7f16\u8bd1\u9636\u6bb5\u4e0d\u62a5\u9519\uff01\uff01\u8fd0\u884c\u65f6\u624d\u53ef\u80fd\u51fa\u73b0\uff01\uff01<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>package com.itheima.d9_exception_custom;\n\/**\n    \u76ee\u6807:\u81ea\u5b9a\u4e49\u5f02\u5e38(\u4e86\u89e3)\n\n    \u5f15\u5165:Java\u5df2\u7ecf\u4e3a\u5f00\u53d1\u4e2d\u53ef\u80fd\u51fa\u73b0\u7684\u5f02\u5e38\u90fd\u8bbe\u8ba1\u4e86\u4e00\u4e2a\u7c7b\u6765\u4ee3\u8868.\n        \u4f46\u662f\u5b9e\u9645\u5f00\u53d1\u4e2d,\u5f02\u5e38\u53ef\u80fd\u6709\u65e0\u6570\u79cd\u60c5\u51b5,Java\u65e0\u6cd5\u4e3a\n        \u8fd9\u4e2a\u4e16\u754c\u4e0a\u6240\u6709\u7684\u5f02\u5e38\u90fd\u5b9a\u4e49\u4e00\u4e2a\u4ee3\u8868\u7c7b\u3002\n        \u5047\u5982\u4e00\u4e2a\u4f01\u4e1a\u5982\u679c\u60f3\u4e3a\u81ea\u5df1\u8ba4\u4e3a\u7684\u67d0\u79cd\u4e1a\u52a1\u95ee\u9898\u5b9a\u4e49\u6210\u4e00\u4e2a\u5f02\u5e38\n        \u5c31\u9700\u8981\u81ea\u5df1\u6765\u81ea\u5b9a\u4e49\u5f02\u5e38\u7c7b.\n\n    \u9700\u6c42\uff1a\u8ba4\u4e3a\u5e74\u9f84\u5c0f\u4e8e0\u5c81\uff0c\u5927\u4e8e200\u5c81\u5c31\u662f\u4e00\u4e2a\u5f02\u5e38\u3002\n\n    \u81ea\u5b9a\u4e49\u5f02\u5e38:\n        \u81ea\u5b9a\u4e49\u7f16\u8bd1\u65f6\u5f02\u5e38.\n            a.\u5b9a\u4e49\u4e00\u4e2a\u5f02\u5e38\u7c7b\u7ee7\u627fException.\n            b.\u91cd\u5199\u6784\u9020\u5668\u3002\n            c.\u5728\u51fa\u73b0\u5f02\u5e38\u7684\u5730\u65b9\u7528throw new \u81ea\u5b9a\u4e49\u5bf9\u8c61\u629b\u51fa!\n            \u7f16\u8bd1\u65f6\u5f02\u5e38\u662f\u7f16\u8bd1\u9636\u6bb5\u5c31\u62a5\u9519\uff0c\u63d0\u9192\u66f4\u52a0\u5f3a\u70c8\uff0c\u4e00\u5b9a\u9700\u8981\u5904\u7406\uff01\uff01\n\n        \u81ea\u5b9a\u4e49\u8fd0\u884c\u65f6\u5f02\u5e38.\n            a.\u5b9a\u4e49\u4e00\u4e2a\u5f02\u5e38\u7c7b\u7ee7\u627fRuntimeException.\n            b.\u91cd\u5199\u6784\u9020\u5668\u3002\n            c.\u5728\u51fa\u73b0\u5f02\u5e38\u7684\u5730\u65b9\u7528throw new \u81ea\u5b9a\u4e49\u5bf9\u8c61\u629b\u51fa!\n            \u63d0\u9192\u4e0d\u5f3a\u70c8\uff0c\u7f16\u8bd1\u9636\u6bb5\u4e0d\u62a5\u9519\uff01\uff01\u8fd0\u884c\u65f6\u624d\u53ef\u80fd\u51fa\u73b0\uff01\uff01\n\n *\/\npublic class ExceptionDemo {\n    public static void main(String&#91;] args) {\n\/\/        try {\n\/\/            checkAge(-34);\n\/\/        } catch (ItheimaAgeIlleagalException e) {\n\/\/            e.printStackTrace();\n\/\/        }\n\n        try {\n            checkAge2(-23);\n        } catch (Exception e) {\n            e.printStackTrace();\n        }\n    }\n\n    public static void checkAge2(int age)  {\n        if(age &lt; 0 || age &gt; 200){\n            \/\/ \u629b\u51fa\u53bb\u4e00\u4e2a\u5f02\u5e38\u5bf9\u8c61\u7ed9\u8c03\u7528\u8005\n            \/\/ throw \uff1a\u5728\u65b9\u6cd5\u5185\u90e8\u76f4\u63a5\u521b\u5efa\u4e00\u4e2a\u5f02\u5e38\u5bf9\u8c61\uff0c\u5e76\u4ece\u6b64\u70b9\u629b\u51fa\n            \/\/ throws : \u7528\u5728\u65b9\u6cd5\u7533\u660e\u4e0a\u7684\uff0c\u629b\u51fa\u65b9\u6cd5\u5185\u90e8\u7684\u5f02\u5e38\n            throw new ItheimaAgeIlleagalRuntimeException(age + \" is illeagal!\");\n        }else {\n            System.out.println(\"\u5e74\u9f84\u5408\u6cd5\uff1a\u63a8\u8350\u5546\u54c1\u7ed9\u5176\u8d2d\u4e70~~\");\n        }\n    }\n\n    public static void checkAge(int age) throws ItheimaAgeIlleagalException {\n        if(age &lt; 0 || age &gt; 200){\n            \/\/ \u629b\u51fa\u53bb\u4e00\u4e2a\u5f02\u5e38\u5bf9\u8c61\u7ed9\u8c03\u7528\u8005\n            \/\/ throw \uff1a\u5728\u65b9\u6cd5\u5185\u90e8\u76f4\u63a5\u521b\u5efa\u4e00\u4e2a\u5f02\u5e38\u5bf9\u8c61\uff0c\u5e76\u4ece\u6b64\u70b9\u629b\u51fa\n            \/\/ throws : \u7528\u5728\u65b9\u6cd5\u7533\u660e\u4e0a\u7684\uff0c\u629b\u51fa\u65b9\u6cd5\u5185\u90e8\u7684\u5f02\u5e38\n            throw new ItheimaAgeIlleagalException(age + \" is illeagal!\");\n        }else {\n            System.out.println(\"\u5e74\u9f84\u5408\u6cd5\uff1a\u63a8\u8350\u5546\u54c1\u7ed9\u5176\u8d2d\u4e70~~\");\n        }\n    }\n}\n\/**\n    \u81ea\u5b9a\u4e49\u7684\u7f16\u8bd1\u65f6\u5f02\u5e38\n      1\u3001\u7ee7\u627fException\n      2\u3001\u91cd\u5199\u6784\u9020\u5668\n *\/\npublic class ItheimaAgeIlleagalException extends Exception{\n    public ItheimaAgeIlleagalException() {\n    }\n\n    public ItheimaAgeIlleagalException(String message) {\n        super(message);\n    }\n}\n\/**\n    \u81ea\u5b9a\u4e49\u7684\u7f16\u8bd1\u65f6\u5f02\u5e38\n      1\u3001\u7ee7\u627fRuntimeException\n      2\u3001\u91cd\u5199\u6784\u9020\u5668\n *\/\npublic class ItheimaAgeIlleagalRuntimeException extends RuntimeException{\n    public ItheimaAgeIlleagalRuntimeException() {\n    }\n\n    public ItheimaAgeIlleagalRuntimeException(String message) {\n        super(message);\n    }\n}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u65e5\u5fd7<\/h2>\n\n\n\n<p>\u5e0c\u671b\u7cfb\u7edf\u80fd\u8bb0\u4f4f\u67d0\u4e9b\u6570\u636e\u662f\u88ab\u8c01\u64cd\u4f5c\u7684\uff0c\u6bd4\u5982\u88ab\u8c01\u5220\u9664\u4e86\uff1f<br>\u60f3\u5206\u6790\u7528\u6237\u6d4f\u89c8\u7cfb\u7edf\u7684\u5177\u4f53\u60c5\u51b5\uff0c\u4ee5\u4fbf\u6316\u6398\u7528\u6237\u7684\u5177\u4f53\u559c\u597d\uff1f<br>\u5f53\u7cfb\u7edf\u5728\u5f00\u53d1\u6216\u8005\u4e0a\u7ebf\u540e\u51fa\u73b0\u4e86bug\uff0c\u5d29\u6e83\u4e86\uff0c\u8be5\u901a\u8fc7\u4ec0\u4e48\u53bb\u5206\u6790\u3001\u5b9a\u4f4dbug\uff1f<\/p>\n\n\n\n<p>\u65e5\u5fd7\uff1a\u7528\u6765\u8bb0\u5f55\u7a0b\u5e8f\u8fd0\u884c\u8fc7\u7a0b\u4e2d\u7684\u4fe1\u606f\uff0c\u5e76\u53ef\u4ee5\u8fdb\u884c\u6c38\u4e45\u5b58\u50a8\u3002\u597d\u6bd4\u751f\u6d3b\u4e2d\u7684\u65e5\u8bb0\uff0c\u53ef\u4ee5\u8bb0\u5f55\u4f60\u751f\u6d3b\u7684\u70b9\u70b9\u6ef4\u6ef4\u3002<\/p>\n\n\n\n<p>\u65e5\u5fd7\u6280\u672f\u5e94\u8be5\u5177\u5907\u54ea\u4e9b\u7279\u70b9\u548c\u4f18\u52bf<br>\u53ef\u4ee5\u5c06\u7cfb\u7edf\u6267\u884c\u7684\u4fe1\u606f\uff0c\u65b9\u4fbf\u7684\u8bb0\u5f55\u5230\u6307\u5b9a\u7684\u4f4d\u7f6e\uff08\u63a7\u5236\u53f0\u3001\u6587\u4ef6\u4e2d\u3001\u6570\u636e\u5e93\u4e2d\uff09\u3002<br>\u53ef\u4ee5\u968f\u65f6\u4ee5\u5f00\u5173\u7684\u5f62\u5f0f\u63a7\u5236\u662f\u65e5\u5fd7\u7684\u8bb0\u5f55\u548c\u53d6\u6d88\uff0c\u65e0\u9700\u4fb5\u5165\u5230\u6e90\u4ee3\u7801\u4e2d\u53bb\u8fdb\u884c\u4fee\u6539\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong><\/strong><\/td><td><strong>\u8f93\u51fa\u8bed\u53e5<\/strong><\/td><td><strong>\u65e5\u5fd7\u6280\u672f<\/strong><\/td><\/tr><tr><td>\u8f93\u51fa\u4f4d\u7f6e<\/td><td>\u8f93\u51fa\u5230\u63a7\u5236\u53f0<\/td><td>\u53ef\u4ee5\u5c06\u65e5\u5fd7\u4fe1\u606f\u5199\u5165\u5230\u6587\u4ef6\u6216\u8005\u6570\u636e\u5e93\u4e2d<\/td><\/tr><tr><td>\u53d6\u6d88\u65e5\u5fd7<\/td><td>\u9700\u8981\u4fee\u6539\u4ee3\u7801\uff0c\u7075\u6d3b\u6027\u6bd4\u8f83\u5dee<\/td><td>\u4e0d\u9700\u8981\u4fee\u6539\u4ee3\u7801\uff0c\u7075\u6d3b\u6027\u6bd4\u8f83\u597d<\/td><\/tr><tr><td>\u591a\u7ebf\u7a0b<\/td><td>\u6027\u80fd\u8f83\u5dee<\/td><td>\u6027\u80fd\u8f83\u597d<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"565\" src=\"https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-1024x565.png\" alt=\"\" class=\"wp-image-648\" srcset=\"https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-1024x565.png 1024w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-300x166.png 300w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-768x424.png 768w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-1536x847.png 1536w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image.png 1624w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Logback\u65e5\u5fd7\u6846\u67b6 https:\/\/logback.qos.ch\/index.html<\/p>\n\n\n\n<p>Logback\u65e5\u5fd7\u6846\u67b6\u5206\u4e3a\u4ee5\u4e0b\u6a21\u5757\uff1a<br>logback-core\uff1a \u8be5\u6a21\u5757\u4e3a\u5176\u4ed6\u4e24\u4e2a\u6a21\u5757\u63d0\u4f9b\u57fa\u7840\u4ee3\u7801\u3002 \uff08\u5fc5\u987b\u6709\uff09<br>logback-classic\uff1a\u5b8c\u6574\u5b9e\u73b0\u4e86slf4j API\u7684\u6a21\u5757\u3002\uff08\u5fc5\u987b\u6709\uff09<br>logback-access \u6a21\u5757\u4e0e Tomcat \u548c Jetty \u7b49 Servlet \u5bb9\u5668\u96c6\u6210\uff0c\u4ee5\u63d0\u4f9b HTTP \u8bbf\u95ee\u65e5\u5fd7\u529f\u80fd\uff08\u53ef\u9009\u6a21\u5757\uff0c\u4ee5\u540e\u63a5\u89e6\uff09<br>\u60f3\u4f7f\u7528Logback\u65e5\u5fd7\u6846\u67b6\uff0c\u81f3\u5c11\u9700\u8981\u5728\u9879\u76ee\u4e2d\u6574\u5408\u5982\u4e0b\u4e09\u4e2a\u6a21\u5757\uff1a<br>slf4j-api\uff1a\u65e5\u5fd7\u63a5\u53e3<br>logback-core\uff1a\u57fa\u7840\u6a21\u5757<br>logback-classic\uff1a\u529f\u80fd\u6a21\u5757\uff0c\u5b83\u5b8c\u6574\u5b9e\u73b0\u4e86slf4j API<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"511\" src=\"https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-1-1024x511.png\" alt=\"\" class=\"wp-image-649\" srcset=\"https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-1-1024x511.png 1024w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-1-300x150.png 300w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-1-768x383.png 768w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-1-1536x767.png 1536w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-1.png 1679w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u5bf9Logback\u65e5\u5fd7\u6846\u67b6\u7684\u63a7\u5236\uff0c\u90fd\u662f\u901a\u8fc7\u6838\u5fc3\u914d\u7f6e\u6587\u4ef6logback.xml\u6765\u5b9e\u73b0\u7684\u3002<br>Logback\u65e5\u5fd7\u8f93\u51fa\u4f4d\u7f6e\u3001\u683c\u5f0f\u8bbe\u7f6e\uff1a<br>\u901a\u8fc7logback.xml \u4e2d\u7684\u6807\u7b7e\u53ef\u4ee5\u8bbe\u7f6e\u8f93\u51fa\u4f4d\u7f6e\u3002<br>\u901a\u5e38\u53ef\u4ee5\u8bbe\u7f6e2\u4e2a\u65e5\u5fd7\u8f93\u51fa\u4f4d\u7f6e\uff1a\u4e00\u4e2a\u662f\u63a7\u5236\u53f0\u3001\u4e00\u4e2a\u662f\u7cfb\u7edf\u6587\u4ef6\u4e2d<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?xml version=\"1.0\" encoding=\"UTF-8\"?&gt;\n&lt;configuration&gt;\n    &lt;!--\n        CONSOLE \uff1a\u8868\u793a\u5f53\u524d\u7684\u65e5\u5fd7\u4fe1\u606f\u662f\u53ef\u4ee5\u8f93\u51fa\u5230\u63a7\u5236\u53f0\u7684\u3002\n    --&gt;\n    &lt;appender name=\"CONSOLE\" class=\"ch.qos.logback.core.ConsoleAppender\"&gt;\n        &lt;!--\u8f93\u51fa\u6d41\u5bf9\u8c61 \u9ed8\u8ba4 System.out \u6539\u4e3a System.err--&gt;\n        &lt;target&gt;System.out&lt;\/target&gt;\n        &lt;encoder&gt;\n            &lt;!--\u683c\u5f0f\u5316\u8f93\u51fa\uff1a%d\u8868\u793a\u65e5\u671f\uff0c%thread\u8868\u793a\u7ebf\u7a0b\u540d\uff0c%-5level\uff1a\u7ea7\u522b\u4ece\u5de6\u663e\u793a5\u4e2a\u5b57\u7b26\u5bbd\u5ea6\n                %msg\uff1a\u65e5\u5fd7\u6d88\u606f\uff0c%n\u662f\u6362\u884c\u7b26--&gt;\n            &lt;pattern&gt;%d{yyyy-MM-dd HH:mm:ss.SSS} &#91;%-5level]  %c &#91;%thread] : %msg%n&lt;\/pattern&gt;\n        &lt;\/encoder&gt;\n    &lt;\/appender&gt;\n\n    &lt;!-- File\u662f\u8f93\u51fa\u7684\u65b9\u5411\u901a\u5411\u6587\u4ef6\u7684 --&gt;\n    &lt;appender name=\"FILE\" class=\"ch.qos.logback.core.rolling.RollingFileAppender\"&gt;\n        &lt;encoder&gt;\n            &lt;pattern&gt;%d{yyyy-MM-dd HH:mm:ss.SSS} &#91;%thread] %-5level %logger{36} - %msg%n&lt;\/pattern&gt;\n            &lt;charset&gt;utf-8&lt;\/charset&gt;\n        &lt;\/encoder&gt;\n        &lt;!--\u65e5\u5fd7\u8f93\u51fa\u8def\u5f84--&gt;\n        &lt;file&gt;C:\/code\/itheima-data.log&lt;\/file&gt;\n        &lt;!--\u6307\u5b9a\u65e5\u5fd7\u6587\u4ef6\u62c6\u5206\u548c\u538b\u7f29\u89c4\u5219--&gt;\n        &lt;rollingPolicy\n                class=\"ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy\"&gt;\n            &lt;!--\u901a\u8fc7\u6307\u5b9a\u538b\u7f29\u6587\u4ef6\u540d\u79f0\uff0c\u6765\u786e\u5b9a\u5206\u5272\u6587\u4ef6\u65b9\u5f0f--&gt;\n            &lt;fileNamePattern&gt;C:\/code\/itheima-data2-%d{yyyy-MMdd}.log%i.gz&lt;\/fileNamePattern&gt;\n            &lt;!--\u6587\u4ef6\u62c6\u5206\u5927\u5c0f--&gt;\n            &lt;maxFileSize&gt;1MB&lt;\/maxFileSize&gt;\n        &lt;\/rollingPolicy&gt;\n    &lt;\/appender&gt;\n\n    &lt;!--\n\n    level:\u7528\u6765\u8bbe\u7f6e\u6253\u5370\u7ea7\u522b\uff0c\u5927\u5c0f\u5199\u65e0\u5173\uff1aTRACE, DEBUG, INFO, WARN, ERROR, ALL \u548c OFF\n   \uff0c \u9ed8\u8ba4debug\n    &lt;root&gt;\u53ef\u4ee5\u5305\u542b\u96f6\u4e2a\u6216\u591a\u4e2a&lt;appender-ref&gt;\u5143\u7d20\uff0c\u6807\u8bc6\u8fd9\u4e2a\u8f93\u51fa\u4f4d\u7f6e\u5c06\u4f1a\u88ab\u672c\u65e5\u5fd7\u7ea7\u522b\u63a7\u5236\u3002\n    --&gt;\n    &lt;root level=\"ALL\"&gt;\n        &lt;appender-ref ref=\"CONSOLE\"\/&gt;\n        &lt;appender-ref ref=\"FILE\" \/&gt;\n    &lt;\/root&gt;\n&lt;\/configuration&gt;<\/code><\/pre>\n\n\n\n<p>\u65e5\u5fd7\u7ea7\u522b<br>ALL \u548c OFF\u5206\u522b\u662f\u6253\u5f00\u3001\u53ca\u5173\u95ed\u5168\u90e8\u65e5\u5fd7\u4fe1\u606f\u3002<br>\u9664\u6b64\u4e4b\u5916\uff0c\u65e5\u5fd7\u7ea7\u522b\u8fd8\u6709\uff1a TRACE &lt; DEBUG &lt; INFO &lt; WARN &lt; ERROR ; \u9ed8\u8ba4\u7ea7\u522b\u662fDEBUG\uff0c\u5bf9\u5e94\u5176\u65b9\u6cd5<br>\u4f5c\u7528\uff1a\u5f53\u5728logback.xml\u6587\u4ef6\u4e2d\u8bbe\u7f6e\u4e86\u67d0\u79cd\u65e5\u5fd7\u7ea7\u522b\u540e\uff0c\u7cfb\u7edf\u5c06\u53ea\u8f93\u51fa\u5f53\u524d\u7ea7\u522b\uff0c\u4ee5\u53ca\u9ad8\u4e8e\u5f53\u524d\u7ea7\u522b\u7684\u65e5\u5fd7\u3002<br>\u5177\u4f53\u5728\u6807\u7b7e\u7684level\u5c5e\u6027\u4e2d\u8bbe\u7f6e\u6307\u5b9a\u7cfb\u7edf\u7684\u65e5\u5fd7\u7ea7\u522b\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">File<\/h2>\n\n\n\n<p>File\u7c7b\u6982\u8ff0<br>File\u7c7b\u7684\u5bf9\u8c61\u4ee3\u8868\u64cd\u4f5c\u7cfb\u7edf\u7684\u6587\u4ef6\uff08\u6587\u4ef6\u3001\u6587\u4ef6\u5939\uff09\uff0cFile\u7c7b\u5728java.io.File\u5305\u4e0b\u3002<br>File\u7c7b\u63d0\u4f9b\u4e86\u8bf8\u5982\uff1a\u521b\u5efa\u6587\u4ef6\u5bf9\u8c61\u4ee3\u8868\u6587\u4ef6\uff0c\u83b7\u53d6\u6587\u4ef6\u4fe1\u606f\uff08\u5927\u5c0f\u3001\u4fee\u6539\u65f6\u95f4\uff09\u3001\u5220\u9664\u6587\u4ef6\u3001\u521b\u5efa\u6587\u4ef6\uff08\u6587\u4ef6\u5939\uff09\u7b49\u529f\u80fd<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u65b9\u6cd5\u540d\u79f0<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td><strong>public&nbsp;<\/strong>File\u200b(String&nbsp;pathname)<\/td><td>\u6839\u636e\u6587\u4ef6\u8def\u5f84\u521b\u5efa\u6587\u4ef6\u5bf9\u8c61<\/td><\/tr><tr><td><strong>public&nbsp;<\/strong>File\u200b(String&nbsp;parent,&nbsp;String&nbsp;child)<\/td><td>\u6839\u636e\u7236\u8def\u5f84\u540d\u5b57\u7b26\u4e32\u548c\u5b50\u8def\u5f84\u540d\u5b57\u7b26\u4e32\u521b\u5efa\u6587\u4ef6\u5bf9\u8c61<\/td><\/tr><tr><td><strong>public&nbsp;<\/strong>File\u200b(File&nbsp;&nbsp;parent,&nbsp;String&nbsp;child)<\/td><td>\u6839\u636e\u7236\u8def\u5f84\u5bf9\u5e94\u6587\u4ef6\u5bf9\u8c61\u548c\u5b50\u8def\u5f84\u540d\u5b57\u7b26\u4e32\u521b\u5efa\u6587\u4ef6\u5bf9\u8c61<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u6ce8\u610f<br>File\u5bf9\u8c61\u53ef\u4ee5\u5b9a\u4f4d\u6587\u4ef6\u548c\u6587\u4ef6\u5939<br>File\u5c01\u88c5\u7684\u5bf9\u8c61\u4ec5\u4ec5\u662f\u4e00\u4e2a\u8def\u5f84\u540d\uff0c\u8fd9\u4e2a\u8def\u5f84\u53ef\u4ee5\u662f\u5b58\u5728\u7684\uff0c\u4e5f\u53ef\u4ee5\u662f\u4e0d\u5b58\u5728\u7684\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.io.File;\n\n\/**\n    \u76ee\u6807\uff1a\u5b66\u4f1a\u521b\u5efaFile\u5bf9\u8c61\u5b9a\u4f4d\u64cd\u4f5c\u7cfb\u7edf\u7684\u6587\u4ef6\uff08\u6587\u4ef6 \u6587\u4ef6\u5939\u7684\uff09\n *\/\npublic class FileDemo {\n    public static void main(String&#91;] args) {\n        \/\/ 1\u3001\u521b\u5efaFile\u5bf9\u8c61\uff08\u6307\u5b9a\u4e86\u6587\u4ef6\u7684\u8def\u5f84\uff09\n        \/\/ \u8def\u5f84\u5199\u6cd5\uff1a D:\\resources\\xueshan.jpeg\n        \/\/          D:\/resources\/xueshan.jpeg\n        \/\/          File.separator\n\/\/        File f = new File(\"D:\\\\resources\\\\xueshan.jpeg\");\n\/\/        File f = new File(\"D:\/resources\/xueshan.jpeg\");\n        File f = new File(\"D:\" + File.separator+\"resources\"+ File.separator +\"xueshan.jpeg\");\n        long size = f.length(); \/\/ \u662f\u6587\u4ef6\u7684\u5b57\u8282\u5927\u5c0f\n        System.out.println(size);\n\n        \/\/ 2\u3001File\u521b\u5efa\u5bf9\u8c61\uff0c\u652f\u6301\u7edd\u5bf9\u8def\u5f84 \u652f\u6301\u76f8\u5bf9\u8def\u5f84\uff08\u91cd\u70b9\uff09\n        File f1 = new File(\"D:\\\\resources\\\\beauty.jpeg\"); \/\/ \u7edd\u5bf9\u8def\u5f84\n        System.out.println(f1.length());\n\n        \/\/ \u76f8\u5bf9\u8def\u5f84\uff1a\u4e00\u822c\u5b9a\u4f4d\u6a21\u5757\u4e2d\u7684\u6587\u4ef6\u7684\u3002 \u76f8\u5bf9\u5230\u5de5\u7a0b\u4e0b\uff01\uff01\n        File f2 = new File(\"file-io-app\/src\/data.txt\");\n        System.out.println(f2.length());\n\n        \/\/ 3\u3001File\u521b\u5efa\u5bf9\u8c61 \uff0c\u53ef\u4ee5\u662f\u6587\u4ef6\u4e5f\u53ef\u4ee5\u662f\u6587\u4ef6\u5939\n        File f3 = new File(\"D:\\\\resources\");\n        System.out.println(f3.exists()); \/\/ \u5224\u65ad\u8fd9\u4e2a\u8def\u5f84\u662f\u5426\u5b58\u5728\uff0c\u8fd9\u4e2a\u6587\u4ef6\u5939\u5b58\u5728\u5426\n\n    }\n}<\/code><\/pre>\n\n\n\n<p>File\u7c7b\u7684\u5224\u65ad\u6587\u4ef6\u7c7b\u578b\u3001\u83b7\u53d6\u6587\u4ef6\u4fe1\u606f\u529f\u80fd<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u65b9\u6cd5\u540d\u79f0<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>public&nbsp;boolean&nbsp;isDirectory()<\/td><td>\u5224\u65ad\u6b64\u8def\u5f84\u540d\u8868\u793a\u7684File\u662f\u5426\u4e3a\u6587\u4ef6\u5939<\/td><\/tr><tr><td>public&nbsp;boolean&nbsp;isFile()<\/td><td>\u5224\u65ad\u6b64\u8def\u5f84\u540d\u8868\u793a\u7684File\u662f\u5426\u4e3a\u6587\u4ef6<\/td><\/tr><tr><td>public&nbsp;boolean&nbsp;exists()<\/td><td>\u5224\u65ad\u6b64\u8def\u5f84\u540d\u8868\u793a\u7684File\u662f\u5426\u5b58\u5728<\/td><\/tr><tr><td>public&nbsp;long&nbsp;length()<\/td><td>\u8fd4\u56de\u6587\u4ef6\u7684\u5927\u5c0f\uff08\u5b57\u8282\u6570\u91cf\uff09<\/td><\/tr><tr><td>public&nbsp;String&nbsp;getAbsolutePath()<\/td><td>\u8fd4\u56de\u6587\u4ef6\u7684\u7edd\u5bf9\u8def\u5f84<\/td><\/tr><tr><td>public&nbsp;String&nbsp;getPath()<\/td><td>\u8fd4\u56de\u5b9a\u4e49\u6587\u4ef6\u65f6\u4f7f\u7528\u7684\u8def\u5f84<\/td><\/tr><tr><td>public&nbsp;String&nbsp;getName()<\/td><td>\u8fd4\u56de\u6587\u4ef6\u7684\u540d\u79f0\uff0c\u5e26\u540e\u7f00<\/td><\/tr><tr><td>public&nbsp;long&nbsp;lastModified()<\/td><td>\u8fd4\u56de\u6587\u4ef6\u7684\u6700\u540e\u4fee\u6539\u65f6\u95f4\uff08\u65f6\u95f4\u6beb\u79d2\u503c\uff09<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.io.File;\nimport java.text.SimpleDateFormat;\n\n\/**\n     \u76ee\u6807\uff1aFile\u7c7b\u7684\u83b7\u53d6\u529f\u80fd\u7684API\n     - public String getAbsolutePath()  \uff1a\u8fd4\u56de\u6b64File\u7684\u7edd\u5bf9\u8def\u5f84\u540d\u5b57\u7b26\u4e32\u3002\n     - public String getPath()  \uff1a \u83b7\u53d6\u521b\u5efa\u6587\u4ef6\u5bf9\u8c61\u7684\u65f6\u5019\u7528\u7684\u8def\u5f84\n     - public String getName()  \uff1a \u8fd4\u56de\u7531\u6b64File\u8868\u793a\u7684\u6587\u4ef6\u6216\u76ee\u5f55\u7684\u540d\u79f0\u3002\n     - public long length()  \uff1a    \u8fd4\u56de\u7531\u6b64File\u8868\u793a\u7684\u6587\u4ef6\u7684\u957f\u5ea6\u3002\n *\/\npublic class FileDemo02 {\n    public static void main(String&#91;] args) {\n        \/\/ 1.\u7edd\u5bf9\u8def\u5f84\u521b\u5efa\u4e00\u4e2a\u6587\u4ef6\u5bf9\u8c61\n        File f1 = new File(\"D:\/resources\/xueshan.jpeg\");\n        \/\/ a.\u83b7\u53d6\u5b83\u7684\u7edd\u5bf9\u8def\u5f84\u3002\n        System.out.println(f1.getAbsolutePath());\n        \/\/ b.\u83b7\u53d6\u6587\u4ef6\u5b9a\u4e49\u7684\u65f6\u5019\u4f7f\u7528\u7684\u8def\u5f84\u3002\n        System.out.println(f1.getPath());\n        \/\/ c.\u83b7\u53d6\u6587\u4ef6\u7684\u540d\u79f0\uff1a\u5e26\u540e\u7f00\u3002\n        System.out.println(f1.getName());\n        \/\/ d.\u83b7\u53d6\u6587\u4ef6\u7684\u5927\u5c0f\uff1a\u5b57\u8282\u4e2a\u6570\u3002\n        System.out.println(f1.length()); \/\/ \u5b57\u8282\u5927\u5c0f\n        \/\/ e.\u83b7\u53d6\u6587\u4ef6\u7684\u6700\u540e\u4fee\u6539\u65f6\u95f4\n        long time = f1.lastModified();\n        System.out.println(\"\u6700\u540e\u4fee\u6539\u65f6\u95f4\uff1a\" + new SimpleDateFormat(\"yyyy\/MM\/dd HH:mm:ss\").format(time));\n        \/\/ f\u3001\u5224\u65ad\u6587\u4ef6\u662f\u6587\u4ef6\u8fd8\u662f\u6587\u4ef6\u5939\n        System.out.println(f1.isFile()); \/\/ true\n        System.out.println(f1.isDirectory()); \/\/ false\n\n        System.out.println(\"-------------------------\");\n\n        File f2 = new File(\"file-io-app\\\\src\\\\data.txt\");\n        \/\/ a.\u83b7\u53d6\u5b83\u7684\u7edd\u5bf9\u8def\u5f84\u3002\n        System.out.println(f2.getAbsolutePath());\n        \/\/ b.\u83b7\u53d6\u6587\u4ef6\u5b9a\u4e49\u7684\u65f6\u5019\u4f7f\u7528\u7684\u8def\u5f84\u3002\n        System.out.println(f2.getPath());\n        \/\/ c.\u83b7\u53d6\u6587\u4ef6\u7684\u540d\u79f0\uff1a\u5e26\u540e\u7f00\u3002\n        System.out.println(f2.getName());\n        \/\/ d.\u83b7\u53d6\u6587\u4ef6\u7684\u5927\u5c0f\uff1a\u5b57\u8282\u4e2a\u6570\u3002\n        System.out.println(f2.length()); \/\/ \u5b57\u8282\u5927\u5c0f\n        \/\/ e.\u83b7\u53d6\u6587\u4ef6\u7684\u6700\u540e\u4fee\u6539\u65f6\u95f4\n        long time1 = f2.lastModified();\n        System.out.println(\"\u6700\u540e\u4fee\u6539\u65f6\u95f4\uff1a\" + new SimpleDateFormat(\"yyyy\/MM\/dd HH:mm:ss\").format(time1));\n        \/\/ f\u3001\u5224\u65ad\u6587\u4ef6\u662f\u6587\u4ef6\u8fd8\u662f\u6587\u4ef6\u5939\n        System.out.println(f2.isFile()); \/\/ true\n        System.out.println(f2.isDirectory()); \/\/ false\n        System.out.println(f2.exists()); \/\/ true\n\n        File file = new File(\"D:\/\");\n        System.out.println(file.isFile()); \/\/ false\n        System.out.println(file.isDirectory()); \/\/ true\n        System.out.println(file.exists()); \/\/ true\n\n        File file1 = new File(\"D:\/aaa\");\n        System.out.println(file1.isFile()); \/\/ false\n        System.out.println(file1.isDirectory()); \/\/ false\n        System.out.println(file1.exists()); \/\/ false\n\n    }\n}<\/code><\/pre>\n\n\n\n<p>File\u7c7b\u521b\u5efa\u6587\u4ef6\u7684\u529f\u80fd<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u65b9\u6cd5\u540d\u79f0<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>public&nbsp;boolean&nbsp;createNewFile()<\/td><td>\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u7a7a\u7684\u6587\u4ef6<\/td><\/tr><tr><td>public&nbsp;boolean&nbsp;mkdir()<\/td><td>\u53ea\u80fd\u521b\u5efa\u4e00\u7ea7\u6587\u4ef6\u5939<\/td><\/tr><tr><td>public&nbsp;boolean&nbsp;mkdirs()<\/td><td>\u53ef\u4ee5\u521b\u5efa\u591a\u7ea7\u6587\u4ef6\u5939<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>File\u7c7b\u5220\u9664\u6587\u4ef6\u7684\u529f\u80fd<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u65b9\u6cd5\u540d\u79f0<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>public&nbsp;boolean&nbsp;delete\u200b()<\/td><td>\u5220\u9664\u7531\u6b64\u62bd\u8c61\u8def\u5f84\u540d\u8868\u793a\u7684\u6587\u4ef6\u6216\u7a7a\u6587\u4ef6\u5939<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>delete\u65b9\u6cd5\u9ed8\u8ba4\u53ea\u80fd\u5220\u9664\u6587\u4ef6\u548c\u7a7a\u6587\u4ef6\u5939\uff0cdelete\u65b9\u6cd5\u76f4\u63a5\u5220\u9664\u4e0d\u8d70\u56de\u6536\u7ad9<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.io.File;\nimport java.io.IOException;\n\n\/**\n     \u76ee\u6807\uff1aFile\u7c7b\u7684\u521b\u5efa\u548c\u5220\u9664\u7684\u65b9\u6cd5\n     - public boolean createNewFile() \uff1a\u5f53\u4e14\u4ec5\u5f53\u5177\u6709\u8be5\u540d\u79f0\u7684\u6587\u4ef6\u5c1a\u4e0d\u5b58\u5728\u65f6\uff0c\n              \u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u7a7a\u6587\u4ef6\u3002 \uff08\u51e0\u4e4e\u4e0d\u7528\u7684\uff0c\u56e0\u4e3a\u4ee5\u540e\u6587\u4ef6\u90fd\u662f\u81ea\u52a8\u521b\u5efa\u7684\uff01\uff09\n     - public boolean delete() \uff1a\u5220\u9664\u7531\u6b64File\u8868\u793a\u7684\u6587\u4ef6\u6216\u76ee\u5f55\u3002 \uff08\u53ea\u80fd\u5220\u9664\u7a7a\u76ee\u5f55\uff09\n     - public boolean mkdir() \uff1a\u521b\u5efa\u7531\u6b64File\u8868\u793a\u7684\u76ee\u5f55\u3002\uff08\u53ea\u80fd\u521b\u5efa\u4e00\u7ea7\u76ee\u5f55\uff09\n     - public boolean mkdirs() \uff1a\u53ef\u4ee5\u521b\u5efa\u591a\u7ea7\u76ee\u5f55\uff08\u5efa\u8bae\u4f7f\u7528\u7684\uff09\n *\/\npublic class FileDemo03 {\n    public static void main(String&#91;] args) throws IOException {\n        File f = new File(\"file-io-app\\\\src\\\\data.txt\");\n        \/\/ a.\u521b\u5efa\u65b0\u6587\u4ef6\uff0c\u521b\u5efa\u6210\u529f\u8fd4\u56detrue ,\u53cd\u4e4b ,\u4e0d\u9700\u8981\u8fd9\u4e2a\uff0c\u4ee5\u540e\u6587\u4ef6\u5199\u51fa\u53bb\u7684\u65f6\u5019\u90fd\u4f1a\u81ea\u52a8\u521b\u5efa\n        System.out.println(f.createNewFile());\n        File f1 = new File(\"file-io-app\\\\src\\\\data02.txt\");\n        System.out.println(f1.createNewFile()); \/\/ \uff08\u51e0\u4e4e\u4e0d\u7528\u7684\uff0c\u56e0\u4e3a\u4ee5\u540e\u6587\u4ef6\u90fd\u662f\u81ea\u52a8\u521b\u5efa\u7684\uff01\uff09\n\n        \/\/ b.mkdir\u521b\u5efa\u4e00\u7ea7\u76ee\u5f55\n        File f2 = new File(\"D:\/resources\/aaa\");\n        System.out.println(f2.mkdir());\n\n        \/\/ c.mkdirs\u521b\u5efa\u591a\u7ea7\u76ee\u5f55(\u91cd\u70b9)\n        File f3 = new File(\"D:\/resources\/ccc\/ddd\/eee\/ffff\");\n\/\/        System.out.println(f3.mkdir());\n        System.out.println(f3.mkdirs()); \/\/ \u652f\u6301\u591a\u7ea7\u521b\u5efa\n\n        \/\/ d.\u5220\u9664\u6587\u4ef6\u6216\u8005\u7a7a\u6587\u4ef6\u5939\n        System.out.println(f1.delete());\n        File f4 = new File(\"D:\/resources\/xueshan.jpeg\");\n        System.out.println(f4.delete()); \/\/ \u5360\u7528\u4e00\u6837\u53ef\u4ee5\u5220\u9664\n\n        \/\/ \u53ea\u80fd\u5220\u9664\u7a7a\u6587\u4ef6\u5939,\u4e0d\u80fd\u5220\u9664\u975e\u7a7a\u6587\u4ef6\u5939.\n        File f5 = new File(\"D:\/resources\/aaa\");\n        System.out.println(f5.delete());\n    }\n}<\/code><\/pre>\n\n\n\n<p>File\u7c7b\u7684\u904d\u5386\u529f\u80fd<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u65b9\u6cd5\u540d\u79f0<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>public&nbsp;String[]&nbsp;list()<\/td><td>\u83b7\u53d6\u5f53\u524d\u76ee\u5f55\u4e0b\u6240\u6709\u7684\"\u4e00\u7ea7\u6587\u4ef6\u540d\u79f0\"\u5230\u4e00\u4e2a\u5b57\u7b26\u4e32\u6570\u7ec4\u4e2d\u53bb\u8fd4\u56de\u3002<\/td><\/tr><tr><td>public&nbsp;File[]&nbsp;listFiles()(\u5e38\u7528)<\/td><td>\u83b7\u53d6\u5f53\u524d\u76ee\u5f55\u4e0b\u6240\u6709\u7684\"\u4e00\u7ea7\u6587\u4ef6\u5bf9\u8c61\"\u5230\u4e00\u4e2a\u6587\u4ef6\u5bf9\u8c61\u6570\u7ec4\u4e2d\u53bb\u8fd4\u56de\uff08\u91cd\u70b9\uff09<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.io.File;\nimport java.util.Arrays;\n\n\/**\n\n    \u76ee\u6807\uff1aFile\u9488\u5bf9\u76ee\u5f55\u7684\u904d\u5386\n    - public String&#91;] list()\uff1a\n         \u83b7\u53d6\u5f53\u524d\u76ee\u5f55\u4e0b\u6240\u6709\u7684\"\u4e00\u7ea7\u6587\u4ef6\u540d\u79f0\"\u5230\u4e00\u4e2a\u5b57\u7b26\u4e32\u6570\u7ec4\u4e2d\u53bb\u8fd4\u56de\u3002\n    - public File&#91;] listFiles()(\u5e38\u7528)\uff1a\n         \u83b7\u53d6\u5f53\u524d\u76ee\u5f55\u4e0b\u6240\u6709\u7684\"\u4e00\u7ea7\u6587\u4ef6\u5bf9\u8c61\"\u5230\u4e00\u4e2a\u6587\u4ef6\u5bf9\u8c61\u6570\u7ec4\u4e2d\u53bb\u8fd4\u56de\uff08\u91cd\u70b9\uff09\n *\/\npublic class FileDemo04 {\n    public static void main(String&#91;] args) {\n        \/\/ 1\u3001\u5b9a\u4f4d\u4e00\u4e2a\u76ee\u5f55\n        File f1 = new File(\"D:\/resources\");\n        String&#91;] names = f1.list();\n        for (String name : names) {\n            System.out.println(name);\n        }\n\n        \/\/ 2.\u4e00\u7ea7\u6587\u4ef6\u5bf9\u8c61\n        \/\/ \u83b7\u53d6\u5f53\u524d\u76ee\u5f55\u4e0b\u6240\u6709\u7684\"\u4e00\u7ea7\u6587\u4ef6\u5bf9\u8c61\"\u5230\u4e00\u4e2a\u6587\u4ef6\u5bf9\u8c61\u6570\u7ec4\u4e2d\u53bb\u8fd4\u56de\uff08\u91cd\u70b9\uff09\n        File&#91;] files = f1.listFiles();\n        for (File f : files) {\n            System.out.println(f.getAbsolutePath());\n        }\n\n        \/\/ \u6ce8\u610f\u4e8b\u9879\n        File dir = new File(\"D:\/resources\/ddd\");\n        File&#91;] files1 = dir.listFiles();\n        System.out.println(Arrays.toString(files1));\n    }\n}<\/code><\/pre>\n\n\n\n<p>listFiles\u65b9\u6cd5\u6ce8\u610f\u4e8b\u9879\uff1a<br>\u5f53\u6587\u4ef6\u4e0d\u5b58\u5728\u65f6\u6216\u8005\u4ee3\u8868\u6587\u4ef6\u65f6\uff0c\u8fd4\u56denull<br>\u5f53\u6587\u4ef6\u5bf9\u8c61\u4ee3\u8868\u4e00\u4e2a\u7a7a\u6587\u4ef6\u5939\u65f6\uff0c\u8fd4\u56de\u4e00\u4e2a\u957f\u5ea6\u4e3a0\u7684\u6570\u7ec4<br>\u5f53\u6587\u4ef6\u5bf9\u8c61\u662f\u4e00\u4e2a\u6709\u5185\u5bb9\u7684\u6587\u4ef6\u5939\u65f6\uff0c\u5c06\u91cc\u9762\u6240\u6709\u6587\u4ef6\u548c\u6587\u4ef6\u5939\u7684\u8def\u5f84\u653e\u5728File\u6570\u7ec4\u4e2d\u8fd4\u56de<br>\u5f53\u6587\u4ef6\u5bf9\u8c61\u662f\u4e00\u4e2a\u6709\u9690\u85cf\u6587\u4ef6\u7684\u6587\u4ef6\u5939\u65f6\uff0c\u5c06\u91cc\u9762\u6240\u6709\u6587\u4ef6\u548c\u6587\u4ef6\u5939\u7684\u8def\u5f84\u653e\u5728File\u6570\u7ec4\u4e2d\u8fd4\u56de\uff0c\u5305\u542b\u9690\u85cf\u6587\u4ef6<br>\u5f53\u6ca1\u6709\u6743\u9650\u8bbf\u95ee\u8be5\u6587\u4ef6\u5939\u65f6\uff0c\u8fd4\u56denull<\/p>\n\n\n\n<p>\u9012\u5f52\u641c\u7d22\u6587\u4ef6<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.io.File;\nimport java.io.IOException;\n\n\/**\n    \u76ee\u6807\uff1a\u53bbD\u5224\u65ad\u641c\u7d22 eDiary.exe\u6587\u4ef6\n *\/\npublic class RecursionDemo05 {\n    public static void main(String&#91;] args) {\n        \/\/ 2\u3001\u4f20\u5165\u76ee\u5f55 \u548c  \u6587\u4ef6\u540d\u79f0\n        searchFile(new File(\"D:\/\") , \"eDiary.exe\");\n    }\n\n    \/**\n     * 1\u3001\u641c\u7d22\u67d0\u4e2a\u76ee\u5f55\u4e0b\u7684\u5168\u90e8\u6587\u4ef6\uff0c\u627e\u5230\u6211\u4eec\u60f3\u8981\u7684\u6587\u4ef6\u3002\n     * @param dir  \u88ab\u641c\u7d22\u7684\u6e90\u76ee\u5f55\n     * @param fileName \u88ab\u641c\u7d22\u7684\u6587\u4ef6\u540d\u79f0\n     *\/\n    public static void searchFile(File dir,String fileName){\n        \/\/ 3\u3001\u5224\u65addir\u662f\u5426\u662f\u76ee\u5f55\n        if(dir != null &amp;&amp; dir.isDirectory()){\n            \/\/ \u53ef\u4ee5\u627e\u4e86\n            \/\/ 4\u3001\u63d0\u53d6\u5f53\u524d\u76ee\u5f55\u4e0b\u7684\u4e00\u7ea7\u6587\u4ef6\u5bf9\u8c61\n            File&#91;] files = dir.listFiles(); \/\/ null  &#91;]\n            \/\/ 5\u3001\u5224\u65ad\u662f\u5426\u5b58\u5728\u4e00\u7ea7\u6587\u4ef6\u5bf9\u8c61\uff0c\u5b58\u5728\u624d\u53ef\u4ee5\u904d\u5386\n            if(files != null &amp;&amp; files.length &gt; 0) {\n                for (File file : files) {\n                    \/\/ 6\u3001\u5224\u65ad\u5f53\u524d\u904d\u5386\u7684\u4e00\u7ea7\u6587\u4ef6\u5bf9\u8c61\u662f\u6587\u4ef6 \u8fd8\u662f \u76ee\u5f55\n                    if(file.isFile()){\n                        \/\/ 7\u3001\u662f\u4e0d\u662f\u54b1\u4eec\u8981\u627e\u7684\uff0c\u662f\u628a\u5176\u8def\u5f84\u8f93\u51fa\u5373\u53ef\n                        if(file.getName().contains(fileName)){\n                            System.out.println(\"\u627e\u5230\u4e86\uff1a\" + file.getAbsolutePath());\n                            \/\/ \u542f\u52a8\u5b83\u3002\n                            try {\n                                Runtime r = Runtime.getRuntime();\n                                r.exec(file.getAbsolutePath());\n                            } catch (IOException e) {\n                                e.printStackTrace();\n                            }\n                        }\n                    }else {\n                        \/\/ 8\u3001\u662f\u6587\u4ef6\u5939\uff0c\u9700\u8981\u7ee7\u7eed\u9012\u5f52\u5bfb\u627e\n                        searchFile(file, fileName);\n                    }\n                }\n            }\n        }else {\n            System.out.println(\"\u5bf9\u4e0d\u8d77\uff0c\u5f53\u524d\u641c\u7d22\u7684\u4f4d\u7f6e\u4e0d\u662f\u6587\u4ef6\u5939\uff01\");\n        }\n    }\n}<\/code><\/pre>\n\n\n\n<p>\u5220\u9664\u975e\u7a7a\u6587\u4ef6\u5939<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.io.File;\n\n\/**\n    \u76ee\u6807\uff1a\u5220\u9664\u975e\u7a7a\u6587\u4ef6\u5939\n *\/\npublic class RecursionDemo07 {\n    public static void main(String&#91;] args) {\n        deleteDir(new File(\"D:\/new\"));\n    }\n\n    \/**\n       \u5220\u9664\u6587\u4ef6\u5939\uff0c\u65e0\u6240\u8c13\u91cc\u9762\u662f\u5426\u6709\u5185\u5bb9\uff0c\u90fd\u53ef\u4ee5\u5220\u9664\n     * @param dir\n     *\/\n    public static void deleteDir(File dir){\n        \/\/ 1\u3001\u5224\u65addir\u5b58\u5728\u4e14\u662f\u6587\u4ef6\u5939\n        if(dir != null &amp;&amp; dir.exists() &amp;&amp; dir.isDirectory()){\n            \/\/ 2\u3001\u63d0\u53d6\u4e00\u7ea7\u6587\u4ef6\u5bf9\u8c61\u3002\n            File&#91;] files = dir.listFiles();\n            \/\/ 3\u3001\u5224\u65ad\u662f\u5426\u5b58\u5728\u4e00\u7ea7\u6587\u4ef6\u5bf9\u8c61\uff0c\u5b58\u5728\u5219\u904d\u5386\u5168\u90e8\u7684\u4e00\u7ea7\u6587\u4ef6\u5bf9\u8c61\u53bb\u5220\u9664\n            if(files != null &amp;&amp; files.length &gt; 0){\n                \/\/ \u91cc\u9762\u6709\u5185\u5bb9\n                for (File file : files) {\n                    \/\/ 4\u3001\u5224\u65adfile\u662f\u6587\u4ef6\u8fd8\u662f\u6587\u4ef6\u5939\uff0c\u6587\u4ef6\u76f4\u63a5\u5220\u9664\n                    if(file.isFile()){\n                        file.delete();\n                    }else {\n                        \/\/ \u9012\u5f52\u5220\u9664\n                        deleteDir(file);\n                    }\n                }\n            }\n            \/\/ \u5220\u9664\u81ea\u5df1\n            dir.delete();\n        }\n    }\n}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">IO\u6d41<\/h2>\n\n\n\n<p class=\"has-vivid-red-color has-text-color has-medium-font-size\">\u6b64\u7ae0\u8282\u9700\u6ce8\u610f\u9879\u76ee\u7f16\u7801\uff08UTF-8\uff09<\/p>\n\n\n\n<p>I\u8868\u793aintput\uff0c\u628a\u786c\u76d8\u6587\u4ef6\u4e2d\u7684\u6570\u636e\u8bfb\u5165\u5230\u5185\u5b58\u7684\u8fc7\u7a0b\uff0c\u79f0\u4e4b\u8f93\u5165\uff0c\u8d1f\u8d23\u8bfb\u3002<br>O\u8868\u793aoutput\uff0c\u628a\u5185\u5b58\u4e2d\u7684\u6570\u636e\u5199\u51fa\u5230\u786c\u76d8\u6587\u4ef6\u7684\u8fc7\u7a0b\uff0c\u79f0\u4e4b\u8f93\u51fa\uff0c\u8d1f\u8d23\u5199\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"400\" src=\"https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-2-1024x400.png\" alt=\"\" class=\"wp-image-650\" srcset=\"https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-2-1024x400.png 1024w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-2-300x117.png 300w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-2-768x300.png 768w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-2-1536x599.png 1536w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-2.png 1576w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u603b\u7ed3\u6d41\u7684\u56db\u5927\u7c7b:<br>\u5b57\u8282\u8f93\u5165\u6d41\uff1a\u4ee5\u5185\u5b58\u4e3a\u57fa\u51c6\uff0c\u6765\u81ea\u78c1\u76d8\u6587\u4ef6\/\u7f51\u7edc\u4e2d\u7684\u6570\u636e\u4ee5\u5b57\u8282\u7684\u5f62\u5f0f\u8bfb\u5165\u5230\u5185\u5b58\u4e2d\u53bb\u7684\u6d41\u79f0\u4e3a\u5b57\u8282\u8f93\u5165\u6d41\u3002<br>\u5b57\u8282\u8f93\u51fa\u6d41\uff1a\u4ee5\u5185\u5b58\u4e3a\u57fa\u51c6\uff0c\u628a\u5185\u5b58\u4e2d\u7684\u6570\u636e\u4ee5\u5b57\u8282\u5199\u51fa\u5230\u78c1\u76d8\u6587\u4ef6\u6216\u8005\u7f51\u7edc\u4e2d\u53bb\u7684\u6d41\u79f0\u4e3a\u5b57\u8282\u8f93\u51fa\u6d41\u3002<br>\u5b57\u7b26\u8f93\u5165\u6d41\uff1a\u4ee5\u5185\u5b58\u4e3a\u57fa\u51c6\uff0c\u6765\u81ea\u78c1\u76d8\u6587\u4ef6\/\u7f51\u7edc\u4e2d\u7684\u6570\u636e\u4ee5\u5b57\u7b26\u7684\u5f62\u5f0f\u8bfb\u5165\u5230\u5185\u5b58\u4e2d\u53bb\u7684\u6d41\u79f0\u4e3a\u5b57\u7b26\u8f93\u5165\u6d41\u3002<br>\u5b57\u7b26\u8f93\u51fa\u6d41\uff1a\u4ee5\u5185\u5b58\u4e3a\u57fa\u51c6\uff0c\u628a\u5185\u5b58\u4e2d\u7684\u6570\u636e\u4ee5\u5b57\u7b26\u5199\u51fa\u5230\u78c1\u76d8\u6587\u4ef6\u6216\u8005\u7f51\u7edc\u4ecb\u8d28\u4e2d\u53bb\u7684\u6d41\u79f0\u4e3a\u5b57\u7b26\u8f93\u51fa\u6d41\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"319\" src=\"https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-3-1024x319.png\" alt=\"\" class=\"wp-image-651\" srcset=\"https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-3-1024x319.png 1024w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-3-300x94.png 300w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-3-768x240.png 768w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-3-1536x479.png 1536w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-3.png 1754w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"306\" src=\"https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-4-1024x306.png\" alt=\"\" class=\"wp-image-652\" srcset=\"https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-4-1024x306.png 1024w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-4-300x90.png 300w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-4-768x230.png 768w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-4-1536x460.png 1536w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-4.png 1835w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">\u5b57\u8282\u6d41<\/h3>\n\n\n\n<p>\u6587\u4ef6\u5b57\u8282\u8f93\u5165\u6d41\uff1aFileInputStream<br>\u4f5c\u7528\uff1a\u4ee5\u5185\u5b58\u4e3a\u57fa\u51c6\uff0c\u628a\u78c1\u76d8\u6587\u4ef6\u4e2d\u7684\u6570\u636e\u4ee5\u5b57\u8282\u7684\u5f62\u5f0f\u8bfb\u53d6\u5230\u5185\u5b58\u4e2d\u53bb\u3002\u000b<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u6784\u9020\u5668<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>public&nbsp;FileInputStream\u200b(File&nbsp;file)<\/td><td>\u521b\u5efa\u5b57\u8282\u8f93\u5165\u6d41\u7ba1\u9053\u4e0e\u6e90\u6587\u4ef6\u5bf9\u8c61\u63a5\u901a<\/td><\/tr><tr><td>public&nbsp;FileInputStream\u200b(String&nbsp;pathname)<\/td><td>\u521b\u5efa\u5b57\u8282\u8f93\u5165\u6d41\u7ba1\u9053\u4e0e\u6e90\u6587\u4ef6\u8def\u5f84\u63a5\u901a<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u65b9\u6cd5\u540d\u79f0<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>public&nbsp;int&nbsp;read()<\/td><td>\u6bcf\u6b21\u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282\u8fd4\u56de\uff0c\u5982\u679c\u5b57\u8282\u5df2\u7ecf\u6ca1\u6709\u53ef\u8bfb\u7684\u8fd4\u56de-1<\/td><\/tr><tr><td>public&nbsp;int&nbsp;read(byte[]&nbsp;buffer)<\/td><td>\u6bcf\u6b21\u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282\u6570\u7ec4\u8fd4\u56de\uff0c\u5982\u679c\u5b57\u8282\u5df2\u7ecf\u6ca1\u6709\u53ef\u8bfb\u7684\u8fd4\u56de-1<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/\u6bcf\u6b21\u8bfb\u53d6\u4e00\u5b57\u8282\npublic class FileInputStreamDemo01 {\n    public static void main(String&#91;] args) throws Exception {\n        \/\/ 1\u3001\u521b\u5efa\u4e00\u4e2a\u6587\u4ef6\u5b57\u8282\u8f93\u5165\u6d41\u7ba1\u9053\u4e0e\u6e90\u6587\u4ef6\u63a5\u901a\u3002\n        \/\/ InputStream is = new FileInputStream(new File(\"file-io-app\\\\src\\\\data.txt\"));\n        \/\/ \u7b80\u5316\u5199\u6cd5\n        InputStream is = new FileInputStream(\"src\/\/data.txt\");\n\n        \/\/ 2\u3001\u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282\u8fd4\u56de \uff08\u6bcf\u6b21\u8bfb\u53d6\u4e00\u6ef4\u6c34\uff09\n\/\/        int b1 = is.read();\n\/\/        System.out.println((char)b1);\n\/\/\n\/\/        int b2 = is.read();\n\/\/        System.out.println((char)b2);\n\/\/\n\/\/        int b3 = is.read();\n\/\/        System.out.println((char)b3);\n\/\/\n\/\/        int b4 = is.read(); \/\/ \u8bfb\u53d6\u5b8c\u6bd5\u8fd4\u56de-1\n\/\/        System.out.println(b4);\n\n        \/\/ 3\u3001\u4f7f\u7528\u5faa\u73af\u6539\u8fdb\n        \/\/ \u5b9a\u4e49\u4e00\u4e2a\u53d8\u91cf\u8bb0\u5f55\u6bcf\u6b21\u8bfb\u53d6\u7684\u5b57\u8282    a  b  3   \u7231\n        \/\/                              o o  o   &#91;ooo]\n        int b;\n        while (( b = is.read() ) != -1){\n            System.out.print((char) b);\n        }\n    }\n}\n\n\/\/\u6bcf\u6b21\u8bfb\u53d6\u4e00\u6570\u7ec4\nimport java.io.FileInputStream;\nimport java.io.InputStream;\n\/**\n   \u76ee\u6807\uff1a\u4f7f\u7528\u6587\u4ef6\u5b57\u8282\u8f93\u5165\u6d41\u6bcf\u6b21\u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282\u6570\u7ec4\u7684\u6570\u636e\u3002\n *\/\npublic class FileInputStreamDemo02 {\n    public static void main(String&#91;] args) throws Exception {\n        \/\/ 1\u3001\u521b\u5efa\u4e00\u4e2a\u6587\u4ef6\u5b57\u8282\u8f93\u5165\u6d41\u7ba1\u9053\u4e0e\u6e90\u6587\u4ef6\u63a5\u901a\n        InputStream is = new FileInputStream(\"src\/com\/itheima\/data02.txt\");\n\n        \/\/ 2\u3001\u5b9a\u4e49\u4e00\u4e2a\u5b57\u8282\u6570\u7ec4\uff0c\u7528\u4e8e\u8bfb\u53d6\u5b57\u8282\u6570\u7ec4\n\/\/        byte&#91;] buffer = new byte&#91;3]; \/\/ 3B\n\/\/        int len = is.read(buffer);\n\/\/        System.out.println(\"\u8bfb\u53d6\u4e86\u51e0\u4e2a\u5b57\u8282\uff1a\" + len);\n\/\/        String rs = new String(buffer);\n\/\/        System.out.println(rs);\n\/\/\n\/\/        int len1 = is.read(buffer);\n\/\/        System.out.println(\"\u8bfb\u53d6\u4e86\u51e0\u4e2a\u5b57\u8282\uff1a\" + len1);\n\/\/        String rs1 = new String(buffer);\n\/\/        System.out.println(rs1);\n\/\/        \/\/ buffer = &#91;a b c]\n\/\/\n\/\/        \/\/ buffer = &#91;a b c]  ==&gt;  &#91;c d c]\n\/\/        int len2 = is.read(buffer);\n\/\/        System.out.println(\"\u8bfb\u53d6\u4e86\u51e0\u4e2a\u5b57\u8282\uff1a\" + len2);\n\/\/        \/\/ \u8bfb\u53d6\u591a\u5c11\u5012\u51fa\u591a\u5c11\n\/\/        String rs2 = new String(buffer,0 ,len2);\n\/\/        System.out.println(rs2);\n\/\/\n\/\/        int len3 = is.read(buffer);\n\/\/        System.out.println(len3); \/\/ \u8bfb\u53d6\u5b8c\u6bd5\u8fd4\u56de-1\n\n        \/\/ 3\u3001\u6539\u8fdb\u4f7f\u7528\u5faa\u73af\uff0c\u6bcf\u6b21\u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282\u6570\u7ec4\n        byte&#91;] buffer = new byte&#91;3];\n        int len; \/\/ \u8bb0\u5f55\u6bcf\u6b21\u8bfb\u53d6\u7684\u5b57\u8282\u6570\u3002\n        while ((len = is.read(buffer)) != -1) {\n            \/\/ \u8bfb\u53d6\u591a\u5c11\u5012\u51fa\u591a\u5c11\n            System.out.print(new String(buffer, 0 , len , \"UTF-8\"));\n        }\n    }\n}\n\n\/\/\u6bcf\u6b21\u5b8c\u6574\u8bfb\u53d6\uff0c\u89e3\u51b3\u4e2d\u6587\u4e71\u7801\u95ee\u9898\nimport java.io.*;\n\n\/**\n   \u76ee\u6807\uff1a\u4f7f\u7528\u6587\u4ef6\u5b57\u8282\u8f93\u5165\u6d41\u4e00\u6b21\u8bfb\u5b8c\u6587\u4ef6\u7684\u5168\u90e8\u5b57\u8282\u3002\u53ef\u4ee5\u89e3\u51b3\u4e71\u7801\u95ee\u9898\u3002\n *\/\npublic class FileInputStreamDemo03 {\n    public static void main(String&#91;] args) throws Exception {\n        \/\/ 1\u3001\u521b\u5efa\u4e00\u4e2a\u6587\u4ef6\u5b57\u8282\u8f93\u5165\u6d41\u7ba1\u9053\u4e0e\u6e90\u6587\u4ef6\u63a5\u901a\n        File f = new File(\"src\/com\/itheima\/data03.txt\");\n        InputStream is = new FileInputStream(f);\n\/*        BufferedReader br = new BufferedReader(new InputStreamReader(is,\"UTF-8\"));\n        String str = null;\n        while((str = br.readLine()) != null){\n            System.out.println(str);\n        }*\/\n        \/\/ 2\u3001\u5b9a\u4e49\u4e00\u4e2a\u5b57\u8282\u6570\u7ec4\u4e0e\u6587\u4ef6\u7684\u5927\u5c0f\u521a\u521a\u4e00\u6837\u5927\u3002\n\/\/        byte&#91;] buffer = new byte&#91;(int) f.length()];\n\/\/        int len = is.read(buffer);\n\/\/        System.out.println(\"\u8bfb\u53d6\u4e86\u591a\u5c11\u4e2a\u5b57\u8282\uff1a\" + len);\n\/\/        System.out.println(\"\u6587\u4ef6\u5927\u5c0f\uff1a\" + f.length());\n\/\/        System.out.println(new String(buffer));\n\n        \/\/ \u8bfb\u53d6\u5168\u90e8\u5b57\u8282\u6570\u7ec4\n        byte&#91;] buffer = is.readAllBytes();\n        System.out.println(new String(buffer,\"UTF-8\"));\n\n    }\n}<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>BufferedReader br = null;\n    try{\n        \/\/ \u5728FileInputStream\u4e2d\u6307\u5b9a\u7f16\u7801\u683c\u5f0f\u4e3a\"GBK\"\n        br = new BufferedReader(new InputStreamReader(new FileInputStream(\"file\"),\"GBK\"));\n        String str = null;\n        while((str = br.readLine()) != null){\n            System.out.println(str);\n        }\n    }catch(FileNotFoundException e){\n        throw new RuntimeException(e);\n    }catch(IOException e){\n        throw new RuntimeException(e);\n    }\n    finally {\n        \/\/ \u5173\u95ed\u6d41\n        if (br == null) {\n            try {\n                br.close();\n            } catch (IOException e) {\n                throw new RuntimeException(e);\n            }\n        }\n    }\n<\/code><\/pre>\n\n\n\n<p>\u6587\u4ef6\u5b57\u8282\u8f93\u51fa\u6d41\uff1aFileOutputStream<br>\u4f5c\u7528\uff1a\u4ee5\u5185\u5b58\u4e3a\u57fa\u51c6\uff0c\u628a\u5185\u5b58\u4e2d\u7684\u6570\u636e\u4ee5\u5b57\u8282\u7684\u5f62\u5f0f\u5199\u51fa\u5230\u78c1\u76d8\u6587\u4ef6\u4e2d\u53bb\u7684\u6d41\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u6784\u9020\u5668<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>public&nbsp;FileOutputStream\u200b(File&nbsp;file)<\/td><td>\u521b\u5efa\u5b57\u8282\u8f93\u51fa\u6d41\u7ba1\u9053\u4e0e\u6e90\u6587\u4ef6\u5bf9\u8c61\u63a5\u901a<\/td><\/tr><tr><td>public&nbsp;FileOutputStream\u200b(File&nbsp;file\uff0cboolean&nbsp;append)<\/td><td>\u521b\u5efa\u5b57\u8282\u8f93\u51fa\u6d41\u7ba1\u9053\u4e0e\u6e90\u6587\u4ef6\u5bf9\u8c61\u63a5\u901a\uff0c\u53ef\u8ffd\u52a0\u6570\u636e<\/td><\/tr><tr><td>public&nbsp;FileOutputStream\u200b(String&nbsp;filepath)<\/td><td>\u521b\u5efa\u5b57\u8282\u8f93\u51fa\u6d41\u7ba1\u9053\u4e0e\u6e90\u6587\u4ef6\u8def\u5f84\u63a5\u901a<\/td><\/tr><tr><td>public&nbsp;FileOutputStream\u200b(String&nbsp;filepath\uff0cboolean&nbsp;append)<\/td><td>\u521b\u5efa\u5b57\u8282\u8f93\u51fa\u6d41\u7ba1\u9053\u4e0e\u6e90\u6587\u4ef6\u8def\u5f84\u63a5\u901a\uff0c\u53ef\u8ffd\u52a0\u6570\u636e<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u6587\u4ef6\u5b57\u8282\u8f93\u51fa\u6d41\uff08FileOutputStream\uff09\u5199\u6570\u636e\u51fa\u53bb\u7684API<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u65b9\u6cd5\u540d\u79f0<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>public&nbsp;void&nbsp;write(int&nbsp;a)<\/td><td>\u5199\u4e00\u4e2a\u5b57\u8282\u51fa\u53bb<\/td><\/tr><tr><td>public&nbsp;void&nbsp;write(byte[]&nbsp;buffer)<\/td><td>\u5199\u4e00\u4e2a\u5b57\u8282\u6570\u7ec4\u51fa\u53bb<\/td><\/tr><tr><td>public&nbsp;void&nbsp;write(byte[]&nbsp;buffer&nbsp;,&nbsp;int&nbsp;pos&nbsp;,&nbsp;int&nbsp;len)<\/td><td>\u5199\u4e00\u4e2a\u5b57\u8282\u6570\u7ec4\u7684\u4e00\u90e8\u5206\u51fa\u53bb\u3002<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u6d41\u7684\u5173\u95ed\u4e0e\u5237\u65b0<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u65b9\u6cd5<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>flush()<\/td><td>\u5237\u65b0\u6d41\uff0c\u8fd8\u53ef\u4ee5\u7ee7\u7eed\u5199\u6570\u636e<\/td><\/tr><tr><td>close()<\/td><td>\u5173\u95ed\u6d41\uff0c\u91ca\u653e\u8d44\u6e90\uff0c\u4f46\u662f\u5728\u5173\u95ed\u4e4b\u524d\u4f1a\u5148\u5237\u65b0\u6d41\u3002\u4e00\u65e6\u5173\u95ed\uff0c\u5c31\u4e0d\u80fd\u518d\u5199\u6570\u636e<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<pre class=\"wp-block-code\"><code>package com.itheima.d4_byte_stream;\n\nimport java.io.File;\nimport java.io.FileNotFoundException;\nimport java.io.FileOutputStream;\nimport java.io.OutputStream;\n\n\/**\n    \u76ee\u6807\uff1a\u5b57\u8282\u8f93\u51fa\u6d41\u7684\u4f7f\u7528\u3002\n\n    IO\u6d41\u7684\u4f53\u7cfb\uff1a\n            \u5b57\u8282\u6d41                                   \u5b57\u7b26\u6d41\n    \u5b57\u8282\u8f93\u5165\u6d41           \u5b57\u8282\u8f93\u51fa\u6d41               \u5b57\u7b26\u8f93\u5165\u6d41       \u5b57\u7b26\u8f93\u51fa\u6d41\n    InputStream         OutputStream           Reader         Writer     (\u62bd\u8c61\u7c7b)\n    FileInputStream     FileOutputStream       FileReader     FileWriter (\u5b9e\u73b0\u7c7b)\n\n    a.FileOutputStream\u6587\u4ef6\u5b57\u8282\u8f93\u51fa\u6d41\u3002\n        -- \u4f5c\u7528\uff1a\u4ee5\u5185\u5b58\u4e3a\u57fa\u51c6\uff0c\u628a\u5185\u5b58\u4e2d\u7684\u6570\u636e\uff0c\u6309\u7167\u5b57\u8282\u7684\u5f62\u5f0f\u5199\u51fa\u5230\u78c1\u76d8\u6587\u4ef6\u4e2d\u53bb\u3002\n                 \u7b80\u5355\u6765\u8bf4\uff0c\u628a\u5185\u5b58\u6570\u636e\u6309\u7167\u5b57\u8282\u5199\u51fa\u5230\u78c1\u76d8\u6587\u4ef6\u4e2d\u53bb\u3002\n        -- \u6784\u9020\u5668\uff1a\n            public FileOutputStream(File file):\u521b\u5efa\u4e00\u4e2a\u5b57\u8282\u8f93\u51fa\u6d41\u7ba1\u9053\u901a\u5411\u76ee\u6807\u6587\u4ef6\u5bf9\u8c61\u3002\n            public FileOutputStream(String file):\u521b\u5efa\u4e00\u4e2a\u5b57\u8282\u8f93\u51fa\u6d41\u7ba1\u9053\u901a\u5411\u76ee\u6807\u6587\u4ef6\u8def\u5f84\u3002\n            public FileOutputStream(File file , boolean append):\u521b\u5efa\u4e00\u4e2a\u8ffd\u52a0\u6570\u636e\u7684\u5b57\u8282\u8f93\u51fa\u6d41\u7ba1\u9053\u901a\u5411\u76ee\u6807\u6587\u4ef6\u5bf9\u8c61\u3002\n            public FileOutputStream(String file , boolean append):\u521b\u5efa\u4e00\u4e2a\u8ffd\u52a0\u6570\u636e\u7684\u5b57\u8282\u8f93\u51fa\u6d41\u7ba1\u9053\u901a\u5411\u76ee\u6807\u6587\u4ef6\u8def\u5f84\u3002\n        -- \u65b9\u6cd5\uff1a\n           public void write(int a):\u5199\u4e00\u4e2a\u5b57\u8282\u51fa\u53bb \u3002\n           public void write(byte&#91;] buffer):\u5199\u4e00\u4e2a\u5b57\u8282\u6570\u7ec4\u51fa\u53bb\u3002\n           public void write(byte&#91;] buffer , int pos , int len):\u5199\u4e00\u4e2a\u5b57\u8282\u6570\u7ec4\u7684\u4e00\u90e8\u5206\u51fa\u53bb\u3002\n                           \u53c2\u6570\u4e00\uff0c\u5b57\u8282\u6570\u7ec4\uff1b\u53c2\u6570\u4e8c\uff1a\u8d77\u59cb\u5b57\u8282\u7d22\u5f15\u4f4d\u7f6e\uff0c\u53c2\u6570\u4e09\uff1a\u5199\u591a\u5c11\u4e2a\u5b57\u8282\u6570\u51fa\u53bb\u3002\n    \u5c0f\u7ed3\uff1a\n        \u8bb0\u4f4f\u3002\n        \u6362\u884c\uff1a  os.write(\"\\r\\n\".getBytes()); \/\/ \u6362\u884c\n        \u8ffd\u52a0\u6570\u636e\u7ba1\u9053\uff1a OutputStream os = new FileOutputStream(\"day10_demo\/out01.txt\" , true); \/\/ \u8ffd\u52a0\u7ba1\u9053\uff01\uff01\n *\/\npublic class OutputStreamDemo04 {\n    public static void main(String&#91;] args) throws Exception {\n        \/\/ 1\u3001\u521b\u5efa\u4e00\u4e2a\u6587\u4ef6\u5b57\u8282\u8f93\u51fa\u6d41\u7ba1\u9053\u4e0e\u76ee\u6807\u6587\u4ef6\u63a5\u901a\n        OutputStream os = new FileOutputStream(\"src\/out04.txt\" , true); \/\/ \u8ffd\u52a0\u6570\u636e\u7ba1\u9053\n\/\/        OutputStream os = new FileOutputStream(\"file-io-app\/src\/out04.txt\"); \/\/ \u5148\u6e05\u7a7a\u4e4b\u524d\u7684\u6570\u636e\uff0c\u5199\u65b0\u6570\u636e\u8fdb\u5165\n\n        \/\/ 2\u3001\u5199\u6570\u636e\u51fa\u53bb\n        \/\/ a.public void write(int a):\u5199\u4e00\u4e2a\u5b57\u8282\u51fa\u53bb\n        os.write('a');\n        os.write(98);\n        os.write(\"\\r\\n\".getBytes()); \/\/ \u6362\u884c\n        \/\/ os.write('\u5f90'); \/\/ &#91;ooo]\n\n        \/\/ b.public void write(byte&#91;] buffer):\u5199\u4e00\u4e2a\u5b57\u8282\u6570\u7ec4\u51fa\u53bb\u3002\n        byte&#91;] buffer = {'a' , 97, 98, 99};\n        os.write(buffer);\n        os.write(\"\\r\\n\".getBytes()); \/\/ \u6362\u884c\n\n        byte&#91;] buffer2 = \"\u6211\u662f\u4e2d\u56fd\u4eba\".getBytes();\n\/\/        byte&#91;] buffer2 = \"\u6211\u662f\u4e2d\u56fd\u4eba\".getBytes(\"GBK\");\n        os.write(buffer2);\n        os.write(\"\\r\\n\".getBytes()); \/\/ \u6362\u884c\n\n\n        \/\/ c. public void write(byte&#91;] buffer , int pos , int len):\u5199\u4e00\u4e2a\u5b57\u8282\u6570\u7ec4\u7684\u4e00\u90e8\u5206\u51fa\u53bb\u3002\n        byte&#91;] buffer3 = {'a',97, 98, 99};\n        os.write(buffer3, 0 , 3);\n        os.write(\"\\r\\n\".getBytes()); \/\/ \u6362\u884c\n\n        \/\/ os.flush(); \/\/ \u5199\u6570\u636e\u5fc5\u987b\uff0c\u5237\u65b0\u6570\u636e \u53ef\u4ee5\u7ee7\u7eed\u4f7f\u7528\u6d41\n        os.close(); \/\/ \u91ca\u653e\u8d44\u6e90\uff0c\u5305\u542b\u4e86\u5237\u65b0\u7684\uff01\u5173\u95ed\u540e\u6d41\u4e0d\u53ef\u4ee5\u4f7f\u7528\u4e86\n    }\n}\n<\/code><\/pre>\n\n\n\n<p>\u6587\u4ef6\u62f7\u8d1d<\/p>\n\n\n\n<p>\u9700\u6c42\uff1a<br>\u628a\u67d0\u4e2a\u89c6\u9891\u590d\u5236\u5230\u5176\u4ed6\u76ee\u5f55\u4e0b\u7684\u201cb.avi\u201d<br>\u601d\u8def\uff1a<br>\u6839\u636e\u6570\u636e\u6e90\u521b\u5efa\u5b57\u8282\u8f93\u5165\u6d41\u5bf9\u8c61<br>\u6839\u636e\u76ee\u7684\u5730\u521b\u5efa\u5b57\u8282\u8f93\u51fa\u6d41\u5bf9\u8c61<br>\u8bfb\u5199\u6570\u636e\uff0c\u590d\u5236\u89c6\u9891<br>\u91ca\u653e\u8d44\u6e90<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.io.FileInputStream;\nimport java.io.FileOutputStream;\nimport java.io.InputStream;\nimport java.io.OutputStream;\n\n\/**\n *   \u76ee\u6807\uff1a\u5b66\u4f1a\u4f7f\u7528\u5b57\u8282\u6d41\u5b8c\u6210\u6587\u4ef6\u7684\u590d\u5236\uff08\u652f\u6301\u4e00\u5207\u6587\u4ef6\u7c7b\u578b\u7684\u590d\u5236\uff09\n *\/\npublic class CopyDemo05 {\n    public static void main(String&#91;] args) {\n        try {\n            \/\/ 1\u3001\u521b\u5efa\u4e00\u4e2a\u5b57\u8282\u8f93\u5165\u6d41\u7ba1\u9053\u4e0e\u539f\u89c6\u9891\u63a5\u901a\n            InputStream is = new FileInputStream(\"file-io-app\/src\/out04.txt\");\n\n            \/\/ 2\u3001\u521b\u5efa\u4e00\u4e2a\u5b57\u8282\u8f93\u51fa\u6d41\u7ba1\u9053\u4e0e\u76ee\u6807\u6587\u4ef6\u63a5\u901a\n            OutputStream os = new FileOutputStream(\"file-io-app\/src\/out05.txt\");\n\n            \/\/ 3\u3001\u5b9a\u4e49\u4e00\u4e2a\u5b57\u8282\u6570\u7ec4\u8f6c\u79fb\u6570\u636e\n            byte&#91;] buffer = new byte&#91;1024];\n            int len; \/\/ \u8bb0\u5f55\u6bcf\u6b21\u8bfb\u53d6\u7684\u5b57\u8282\u6570\u3002\n            while ((len = is.read(buffer)) != -1){\n                os.write(buffer, 0 , len);\n            }\n            System.out.println(\"\u590d\u5236\u5b8c\u6210\u4e86\uff01\");\n\n            \/\/ 4\u3001\u5173\u95ed\u6d41\u3002\n            os.close();\n            is.close();\n        } catch (Exception e){\n            e.printStackTrace();\n        }\n    }\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u8d44\u6e90\u91ca\u653e\u7684\u65b9\u5f0f<\/h3>\n\n\n\n<p>try-catch-finally<br>finally\uff1a\u653e\u5728try-catch\u540e\u9762\u7684\uff0c\u65e0\u8bba\u662f\u6b63\u5e38\u6267\u884c\u8fd8\u662f\u5f02\u5e38\u6267\u884c\u4ee3\u7801\uff0c\u6700\u540e\u4e00\u5b9a\u8981\u6267\u884c\uff0c\u9664\u975eJVM\u9000\u51fa\u3002<br>\u4f5c\u7528\uff1a\u4e00\u822c\u7528\u4e8e\u8fdb\u884c\u6700\u540e\u7684\u8d44\u6e90\u91ca\u653e\u64cd\u4f5c\uff08\u4e13\u4e1a\u7ea7\u505a\u6cd5\uff09<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>package com.itheima.d5_resource;\n\nimport java.io.*;\n\n\/**\n *   \u76ee\u6807\uff1a\u5b66\u4f1a\u4f7f\u7528finally\u91ca\u653e\u8d44\u6e90\u3002\n *\/\npublic class TryCatchFinallyDemo1 {\n    public static void main(String&#91;] args) {\n        InputStream is = null;\n        OutputStream os = null;\n        try {\n\n            \/\/ System.out.println(10\/ 0);\n\n            \/\/ 1\u3001\u521b\u5efa\u4e00\u4e2a\u5b57\u8282\u8f93\u5165\u6d41\u7ba1\u9053\u4e0e\u539f\u89c6\u9891\u63a5\u901a\n             is = new FileInputStream(\"file-io-app\/src\/out04.txt\");\n\n            \/\/ 2\u3001\u521b\u5efa\u4e00\u4e2a\u5b57\u8282\u8f93\u51fa\u6d41\u7ba1\u9053\u4e0e\u76ee\u6807\u6587\u4ef6\u63a5\u901a\n             os = new FileOutputStream(\"file-io-app\/src\/out05.txt\");\n\n            \/\/ 3\u3001\u5b9a\u4e49\u4e00\u4e2a\u5b57\u8282\u6570\u7ec4\u8f6c\u79fb\u6570\u636e\n            byte&#91;] buffer = new byte&#91;1024];\n            int len; \/\/ \u8bb0\u5f55\u6bcf\u6b21\u8bfb\u53d6\u7684\u5b57\u8282\u6570\u3002\n            while ((len = is.read(buffer)) != -1){\n                os.write(buffer, 0 , len);\n            }\n            System.out.println(\"\u590d\u5236\u5b8c\u6210\u4e86\uff01\");\n\n         \/\/   System.out.println( 10 \/ 0);\n\n        } catch (Exception e){\n            e.printStackTrace();\n        } finally {\n            \/\/ \u65e0\u8bba\u4ee3\u7801\u662f\u6b63\u5e38\u7ed3\u675f\uff0c\u8fd8\u662f\u51fa\u73b0\u5f02\u5e38\u90fd\u8981\u6700\u540e\u6267\u884c\u8fd9\u91cc\n            System.out.println(\"========finally=========\");\n            try {\n                \/\/ 4\u3001\u5173\u95ed\u6d41\u3002\n                if(os!=null)os.close();\n            } catch (IOException e) {\n                e.printStackTrace();\n            }\n            try {\n                if(is != null) is.close();\n            } catch (IOException e) {\n                e.printStackTrace();\n            }\n        }\n\n        System.out.println(test(10, 2));\n    }\n\n    public static int test(int a , int b){\n        try {\n            int c = a \/ b;\n            return c;\n        }catch (Exception e){\n            e.printStackTrace();\n            return -111111; \/\/ \u8ba1\u7b97\u51fa\u73b0bug.\n        }finally {\n            System.out.println(\"--finally--\");\n            \/\/ \u54ea\u6015\u4e0a\u9762\u6709return\u8bed\u53e5\u6267\u884c\uff0c\u4e5f\u5fc5\u987b\u5148\u6267\u884c\u5b8c\u8fd9\u91cc\u624d\u53ef\u4ee5\uff01\n            \/\/ \u5f00\u53d1\u4e2d\u4e0d\u5efa\u8bae\u5728\u8fd9\u91cc\u52a0return \uff0c\u5982\u679c\u52a0\u4e86\uff0c\u8fd4\u56de\u7684\u6c38\u8fdc\u662f\u8fd9\u91cc\u7684\u6570\u636e\u4e86\uff0c\u8fd9\u6837\u4f1a\u51fa\u95ee\u9898\uff01\n            return 100;\n        }\n    }\n}\n<\/code><\/pre>\n\n\n\n<p> <\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"438\" src=\"https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-5-1024x438.png\" alt=\"\" class=\"wp-image-654\" srcset=\"https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-5-1024x438.png 1024w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-5-300x128.png 300w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-5-768x329.png 768w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-5.png 1523w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/JDK7\npackage com.itheima.d5_resource;\n\nimport java.io.*;\n\n\/**\n *   \u76ee\u6807\uff1a\u5b66\u4f1a\u4f7f\u7528JDK 7\u7684\u65b0\u65b9\u5f0f\u91ca\u653e\u8d44\u6e90\n *\/\npublic class TryCatchResouceDemo2 {\n    public static void main(String&#91;] args) {\n\n        try (\n                \/\/ \u8fd9\u91cc\u9762\u53ea\u80fd\u653e\u7f6e\u8d44\u6e90\u5bf9\u8c61\uff0c\u7528\u5b8c\u4f1a\u81ea\u52a8\u5173\u95ed\uff1a\u81ea\u52a8\u8c03\u7528\u8d44\u6e90\u5bf9\u8c61\u7684close\u65b9\u6cd5\u5173\u95ed\u8d44\u6e90\uff08\u5373\u4f7f\u51fa\u73b0\u5f02\u5e38\u4e5f\u4f1a\u505a\u5173\u95ed\u64cd\u4f5c\uff09\n                \/\/ 1\u3001\u521b\u5efa\u4e00\u4e2a\u5b57\u8282\u8f93\u5165\u6d41\u7ba1\u9053\u4e0e\u539f\u89c6\u9891\u63a5\u901a\n               InputStream is = new FileInputStream(\"file-io-app\/src\/out04.txt\");\n                \/\/ 2\u3001\u521b\u5efa\u4e00\u4e2a\u5b57\u8282\u8f93\u51fa\u6d41\u7ba1\u9053\u4e0e\u76ee\u6807\u6587\u4ef6\u63a5\u901a\n               OutputStream os = new FileOutputStream(\"file-io-app\/src\/out05.txt\");\n\n               \/\/ int age = 23; \/\/ \u8fd9\u91cc\u53ea\u80fd\u653e\u8d44\u6e90\n                MyConnection connection = new MyConnection(); \/\/ \u6700\u7ec8\u4f1a\u81ea\u52a8\u8c03\u7528\u8d44\u6e90\u7684close\u65b9\u6cd5\n                ) {\n\n            \/\/ 3\u3001\u5b9a\u4e49\u4e00\u4e2a\u5b57\u8282\u6570\u7ec4\u8f6c\u79fb\u6570\u636e\n            byte&#91;] buffer = new byte&#91;1024];\n            int len; \/\/ \u8bb0\u5f55\u6bcf\u6b21\u8bfb\u53d6\u7684\u5b57\u8282\u6570\u3002\n            while ((len = is.read(buffer)) != -1){\n                os.write(buffer, 0 , len);\n            }\n            System.out.println(\"\u590d\u5236\u5b8c\u6210\u4e86\uff01\");\n\n        } catch (Exception e){\n            e.printStackTrace();\n        }\n\n    }\n}\n\nclass MyConnection implements AutoCloseable{\n    @Override\n    public void close() throws IOException {\n        System.out.println(\"\u8fde\u63a5\u8d44\u6e90\u88ab\u6210\u529f\u91ca\u653e\u4e86\uff01\");\n    }\n}\n\/\/JDK9\npackage com.itheima.d5_resource;\n\nimport java.io.*;\n\n\/**\n *   \u76ee\u6807\uff1aJDK 9\u91ca\u653e\u8d44\u6e90\u7684\u65b9\u5f0f\uff1a\u53ef\u4ee5\u4e86\u89e3\u4e0b\u3002\n *\/\npublic class TryCatchResouceDemo3 {\n    public static void main(String&#91;] args) throws Exception {\n\n        \/\/ \u8fd9\u91cc\u9762\u53ea\u80fd\u653e\u7f6e\u8d44\u6e90\u5bf9\u8c61\uff0c\u7528\u5b8c\u4f1a\u81ea\u52a8\u5173\u95ed\uff1a\u81ea\u52a8\u8c03\u7528\u8d44\u6e90\u5bf9\u8c61\u7684close\u65b9\u6cd5\u5173\u95ed\u8d44\u6e90\uff08\u5373\u4f7f\u51fa\u73b0\u5f02\u5e38\u4e5f\u4f1a\u505a\u5173\u95ed\u64cd\u4f5c\uff09\n        \/\/ 1\u3001\u521b\u5efa\u4e00\u4e2a\u5b57\u8282\u8f93\u5165\u6d41\u7ba1\u9053\u4e0e\u539f\u89c6\u9891\u63a5\u901a\n        InputStream is = new FileInputStream(\"file-io-app\/src\/out04.txt\");\n        \/\/ 2\u3001\u521b\u5efa\u4e00\u4e2a\u5b57\u8282\u8f93\u51fa\u6d41\u7ba1\u9053\u4e0e\u76ee\u6807\u6587\u4ef6\u63a5\u901a\n        OutputStream os = new FileOutputStream(\"file-io-app\/src\/out05.txt\");\n        try ( is ; os ) {\n            \/\/ 3\u3001\u5b9a\u4e49\u4e00\u4e2a\u5b57\u8282\u6570\u7ec4\u8f6c\u79fb\u6570\u636e\n            byte&#91;] buffer = new byte&#91;1024];\n            int len; \/\/ \u8bb0\u5f55\u6bcf\u6b21\u8bfb\u53d6\u7684\u5b57\u8282\u6570\u3002\n            while ((len = is.read(buffer)) != -1){\n                os.write(buffer, 0 , len);\n            }\n            System.out.println(\"\u590d\u5236\u5b8c\u6210\u4e86\uff01\");\n\n        } catch (Exception e){\n            e.printStackTrace();\n        }\n    }\n}<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"245\" src=\"https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-6-1024x245.png\" alt=\"\" class=\"wp-image-655\" srcset=\"https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-6-1024x245.png 1024w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-6-300x72.png 300w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-6-768x184.png 768w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-6-1536x368.png 1536w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-6.png 1790w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">\u5b57\u7b26\u6d41<\/h3>\n\n\n\n<p>\u6587\u4ef6\u5b57\u7b26\u8f93\u5165\u6d41\uff1aReader<br>\u4f5c\u7528\uff1a\u4ee5\u5185\u5b58\u4e3a\u57fa\u51c6\uff0c\u628a\u78c1\u76d8\u6587\u4ef6\u4e2d\u7684\u6570\u636e\u4ee5\u5b57\u7b26\u7684\u5f62\u5f0f\u8bfb\u53d6\u5230\u5185\u5b58\u4e2d\u53bb\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u6784\u9020\u5668<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>public&nbsp;FileReader\u200b(File&nbsp;file)<\/td><td>\u521b\u5efa\u5b57\u7b26\u8f93\u5165\u6d41\u7ba1\u9053\u4e0e\u6e90\u6587\u4ef6\u5bf9\u8c61\u63a5\u901a<\/td><\/tr><tr><td>public&nbsp;FileReader\u200b(String&nbsp;pathname)<\/td><td>\u521b\u5efa\u5b57\u7b26\u8f93\u5165\u6d41\u7ba1\u9053\u4e0e\u6e90\u6587\u4ef6\u8def\u5f84\u63a5\u901a<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u65b9\u6cd5\u540d\u79f0<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>public&nbsp;int&nbsp;read()<\/td><td>\u6bcf\u6b21\u8bfb\u53d6\u4e00\u4e2a\u5b57\u7b26\u8fd4\u56de\uff0c\u5982\u679c\u5b57\u7b26\u5df2\u7ecf\u6ca1\u6709\u53ef\u8bfb\u7684\u8fd4\u56de-1<\/td><\/tr><tr><td>public&nbsp;int&nbsp;read(char[]&nbsp;buffer)<\/td><td>\u6bcf\u6b21\u8bfb\u53d6\u4e00\u4e2a\u5b57\u7b26\u6570\u7ec4\uff0c\u8fd4\u56de\u8bfb\u53d6\u7684\u5b57\u7b26\u4e2a\u6570\uff0c\u5982\u679c\u5b57\u7b26\u5df2\u7ecf\u6ca1\u6709\u53ef\u8bfb\u7684\u8fd4\u56de-1<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/\u4e00\u6b21\u8bfb\u53d6\u4e00\u4e2a\u5b57\u7b26\npackage com.itheima.d6_char_stream;\n\nimport java.io.File;\nimport java.io.FileReader;\nimport java.io.Reader;\n\n\/**\n     \u76ee\u6807\uff1a\u5b57\u7b26\u8f93\u5165\u6d41\u7684\u4f7f\u7528\u3002\n\n     IO\u6d41\u7684\u4f53\u7cfb\uff1a\n            \u5b57\u8282\u6d41                                   \u5b57\u7b26\u6d41\n     \u5b57\u8282\u8f93\u5165\u6d41           \u5b57\u8282\u8f93\u51fa\u6d41               \u5b57\u7b26\u8f93\u5165\u6d41       \u5b57\u7b26\u8f93\u51fa\u6d41\n     InputStream         OutputStream            Reader         Writer     (\u62bd\u8c61\u7c7b)\n     FileInputStream     FileOutputStream        FileReader     FileWriter (\u5b9e\u73b0\u7c7b)\n\n     c.FileReader:\u6587\u4ef6\u5b57\u7b26\u8f93\u5165\u6d41\u3002\n         -- \u4f5c\u7528\uff1a\u4ee5\u5185\u5b58\u4e3a\u57fa\u51c6\uff0c\u628a\u78c1\u76d8\u6587\u4ef6\u7684\u6570\u636e\u4ee5\u5b57\u7b26\u7684\u5f62\u5f0f\u8bfb\u5165\u5230\u5185\u5b58\u3002\n            \u7b80\u5355\u6765\u8bf4\uff0c\u8bfb\u53d6\u6587\u672c\u6587\u4ef6\u5185\u5bb9\u5230\u5185\u5b58\u4e2d\u53bb\u3002\n\n         -- \u6784\u9020\u5668\uff1a\n            public FileReader(File file):\u521b\u5efa\u4e00\u4e2a\u5b57\u7b26\u8f93\u5165\u6d41\u4e0e\u6e90\u6587\u4ef6\u5bf9\u8c61\u63a5\u901a\u3002\n            public FileReader(String filePath):\u521b\u5efa\u4e00\u4e2a\u5b57\u7b26\u8f93\u5165\u6d41\u4e0e\u6e90\u6587\u4ef6\u8def\u5f84\u63a5\u901a\u3002\n\n         -- \u65b9\u6cd5\uff1a\n            public int read(): \u8bfb\u53d6\u4e00\u4e2a\u5b57\u7b26\u7684\u7f16\u53f7\u8fd4\u56de\uff01 \u8bfb\u53d6\u5b8c\u6bd5\u8fd4\u56de-1\n            public int read(char&#91;] buffer):\u8bfb\u53d6\u4e00\u4e2a\u5b57\u7b26\u6570\u7ec4\uff0c\u8bfb\u53d6\u591a\u5c11\u4e2a\u5b57\u7b26\u5c31\u8fd4\u56de\u591a\u5c11\u4e2a\u6570\u91cf\uff0c\u8bfb\u53d6\u5b8c\u6bd5\u8fd4\u56de-1\n     \u5c0f\u7ed3\uff1a\n        \u5b57\u7b26\u6d41\u4e00\u4e2a\u4e00\u4e2a\u5b57\u7b26\u7684\u8bfb\u53d6\u6587\u672c\u5185\u5bb9\u8f93\u51fa\uff0c\u53ef\u4ee5\u89e3\u51b3\u4e2d\u6587\u8bfb\u53d6\u8f93\u51fa\u4e71\u7801\u7684\u95ee\u9898\u3002\n        \u5b57\u7b26\u6d41\u5f88\u9002\u5408\u64cd\u4f5c\u6587\u672c\u6587\u4ef6\u5185\u5bb9\u3002\n        \u4f46\u662f\uff1a\u4e00\u4e2a\u4e00\u4e2a\u5b57\u7b26\u7684\u8bfb\u53d6\u6587\u672c\u5185\u5bb9\u6027\u80fd\u8f83\u5dee\uff01\uff01\n *\/\npublic class FileReaderDemo01 {\n    public static void main(String&#91;] args) throws Exception {\n        \/\/ \u76ee\u6807\uff1a\u6bcf\u6b21\u8bfb\u53d6\u4e00\u4e2a\u5b57\u7b26\u3002\n        \/\/ 1\u3001\u521b\u5efa\u4e00\u4e2a\u5b57\u7b26\u8f93\u5165\u6d41\u7ba1\u9053\u4e0e\u6e90\u6587\u4ef6\u63a5\u901a\n        Reader fr = new FileReader(\"src\\\\data06.txt\");\n\n        \/\/ 2\u3001\u8bfb\u53d6\u4e00\u4e2a\u5b57\u7b26\u8fd4\u56de\uff0c\u6ca1\u6709\u53ef\u8bfb\u7684\u5b57\u7b26\u4e86\u8fd4\u56de-1\n\/\/        int code = fr.read();\n\/\/        System.out.print((char)code);\n\/\/\n\/\/        int code1 = fr.read();\n\/\/        System.out.print((char)code1);\n\n        \/\/ 3\u3001\u4f7f\u7528\u5faa\u73af\u8bfb\u53d6\u5b57\u7b26\n        int code;\n        while ((code = fr.read()) != -1){\n            System.out.print((char) code);\n        }\n    }\n}\n\n\/\/\u6309\u56fa\u5b9a\u5927\u5c0f\u8bfb\u53d6\u6570\u7ec4\npackage com.itheima.d6_char_stream;\n\nimport java.io.FileReader;\nimport java.io.Reader;\n\n\/**\n     \u76ee\u6807\uff1a\u5b57\u7b26\u8f93\u5165\u6d41\u7684\u4f7f\u7528-\u6309\u7167\u5b57\u7b26\u6570\u7ec4\u8bfb\u53d6\u3002\n\n     IO\u6d41\u7684\u4f53\u7cfb\uff1a\n            \u5b57\u8282\u6d41                                       \u5b57\u7b26\u6d41\n     \u5b57\u8282\u8f93\u5165\u6d41           \u5b57\u8282\u8f93\u51fa\u6d41               \u5b57\u7b26\u8f93\u5165\u6d41       \u5b57\u7b26\u8f93\u51fa\u6d41\n     InputStream         OutputStream           Reader         Writer     (\u62bd\u8c61\u7c7b)\n     FileInputStream     FileOutputStream       FileReader     FileWriter (\u5b9e\u73b0\u7c7b)\n\n     c.FileReader:\u6587\u4ef6\u5b57\u7b26\u8f93\u5165\u6d41\u3002\n         -- \u4f5c\u7528\uff1a\u4ee5\u5185\u5b58\u4e3a\u57fa\u51c6\uff0c\u628a\u78c1\u76d8\u6587\u4ef6\u7684\u6570\u636e\u4ee5\u5b57\u7b26\u7684\u5f62\u5f0f\u8bfb\u5165\u5230\u5185\u5b58\u3002\n            \u7b80\u5355\u6765\u8bf4\uff0c\u8bfb\u53d6\u6587\u672c\u6587\u4ef6\u5185\u5bb9\u5230\u5185\u5b58\u4e2d\u53bb\u3002\n         -- \u6784\u9020\u5668\uff1a\n            public FileReader(File file):\u521b\u5efa\u4e00\u4e2a\u5b57\u7b26\u8f93\u5165\u6d41\u4e0e\u6e90\u6587\u4ef6\u5bf9\u8c61\u63a5\u901a\u3002\n            public FileReader(String filePath):\u521b\u5efa\u4e00\u4e2a\u5b57\u7b26\u8f93\u5165\u6d41\u4e0e\u6e90\u6587\u4ef6\u8def\u5f84\u63a5\u901a\u3002\n         -- \u65b9\u6cd5\uff1a\n            public int read(): \u8bfb\u53d6\u4e00\u4e2a\u5b57\u7b26\u7684\u7f16\u53f7\u8fd4\u56de\uff01 \u8bfb\u53d6\u5b8c\u6bd5\u8fd4\u56de-1\n            public int read(char&#91;] buffer):\u8bfb\u53d6\u4e00\u4e2a\u5b57\u7b26\u6570\u7ec4\uff0c\n                    \u8bfb\u53d6\u591a\u5c11\u4e2a\u5b57\u7b26\u5c31\u8fd4\u56de\u591a\u5c11\u4e2a\u6570\u91cf\uff0c\u8bfb\u53d6\u5b8c\u6bd5\u8fd4\u56de-1\n     \u5c0f\u7ed3\uff1a\n         \u5b57\u7b26\u6d41\u6309\u7167\u5b57\u7b26\u6570\u7ec4\u5faa\u73af\u8bfb\u53d6\u6570\u636e\uff0c\u53ef\u4ee5\u89e3\u51b3\u4e2d\u6587\u8bfb\u53d6\u8f93\u51fa\u4e71\u7801\u7684\u95ee\u9898\uff0c\u800c\u4e14\u6027\u80fd\u4e5f\u8f83\u597d\uff01\uff01\n *\/\npublic class FileReaderDemo02 {\n    public static void main(String&#91;] args) throws Exception {\n        \/\/ 1\u3001\u521b\u5efa\u4e00\u4e2a\u6587\u4ef6\u5b57\u7b26\u8f93\u5165\u6d41\u4e0e\u6e90\u6587\u4ef6\u63a5\u901a\n        Reader fr = new FileReader(\"file-io-app\/src\/data07.txt\");\n\n        \/\/ 2\u3001\u7528\u5faa\u73af\uff0c\u6bcf\u6b21\u8bfb\u53d6\u4e00\u4e2a\u5b57\u7b26\u6570\u7ec4\u7684\u6570\u636e\u3002  1024 + 1024 + 8\n        char&#91;] buffer = new char&#91;1024]; \/\/ 1K\u5b57\u7b26\n        int len;\n        while ((len = fr.read(buffer)) != -1) {\n            String rs = new String(buffer, 0, len);\n            System.out.print(rs);\n        }\n\n    }\n}\n\n<\/code><\/pre>\n\n\n\n<p>\u6587\u4ef6\u5b57\u7b26\u8f93\u51fa\u6d41\uff1aFileWriter<br>\u4f5c\u7528\uff1a\u4ee5\u5185\u5b58\u4e3a\u57fa\u51c6\uff0c\u628a\u5185\u5b58\u4e2d\u7684\u6570\u636e\u4ee5\u5b57\u7b26\u7684\u5f62\u5f0f\u5199\u51fa\u5230\u78c1\u76d8\u6587\u4ef6\u4e2d\u53bb\u7684\u6d41\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u6784\u9020\u5668<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>public&nbsp;FileWriter(File&nbsp;file)<\/td><td>\u521b\u5efa\u5b57\u7b26\u8f93\u51fa\u6d41\u7ba1\u9053\u4e0e\u6e90\u6587\u4ef6\u5bf9\u8c61\u63a5\u901a<\/td><\/tr><tr><td>public&nbsp;FileWriter\u200b(File&nbsp;file\uff0cboolean&nbsp;append)<\/td><td>\u521b\u5efa\u5b57\u7b26\u8f93\u51fa\u6d41\u7ba1\u9053\u4e0e\u6e90\u6587\u4ef6\u5bf9\u8c61\u63a5\u901a\uff0c\u53ef\u8ffd\u52a0\u6570\u636e<\/td><\/tr><tr><td>public&nbsp;FileWriter\u200b(String&nbsp;filepath)<\/td><td>\u521b\u5efa\u5b57\u7b26\u8f93\u51fa\u6d41\u7ba1\u9053\u4e0e\u6e90\u6587\u4ef6\u8def\u5f84\u63a5\u901a<\/td><\/tr><tr><td>public&nbsp;FileWriter\u200b(String&nbsp;filepath\uff0cboolean&nbsp;append)<\/td><td>\u521b\u5efa\u5b57\u7b26\u8f93\u51fa\u6d41\u7ba1\u9053\u4e0e\u6e90\u6587\u4ef6\u8def\u5f84\u63a5\u901a\uff0c\u53ef\u8ffd\u52a0\u6570\u636e<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u6587\u4ef6\u5b57\u7b26\u8f93\u51fa\u6d41\uff08FileWriter\uff09\u5199\u6570\u636e\u51fa\u53bb\u7684API<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u65b9\u6cd5\u540d\u79f0<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>void&nbsp;write\u200b(int&nbsp;c)<\/td><td>\u5199\u4e00\u4e2a\u5b57\u7b26<\/td><\/tr><tr><td>void&nbsp;write\u200b(char[]&nbsp;cbuf)<\/td><td>\u5199\u5165\u4e00\u4e2a\u5b57\u7b26\u6570\u7ec4<\/td><\/tr><tr><td>void&nbsp;write\u200b(char[]&nbsp;cbuf,&nbsp;int&nbsp;off,&nbsp;int&nbsp;len)<\/td><td>\u5199\u5165\u5b57\u7b26\u6570\u7ec4\u7684\u4e00\u90e8\u5206<\/td><\/tr><tr><td>void&nbsp;write\u200b(String&nbsp;str)<\/td><td>\u5199\u4e00\u4e2a\u5b57\u7b26\u4e32<\/td><\/tr><tr><td>void&nbsp;write\u200b(String&nbsp;str,&nbsp;int&nbsp;off,&nbsp;int&nbsp;len)<\/td><td>\u5199\u4e00\u4e2a\u5b57\u7b26\u4e32\u7684\u4e00\u90e8\u5206<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u6d41\u7684\u5173\u95ed\u4e0e\u5237\u65b0<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u65b9\u6cd5<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>flush()<\/td><td>\u5237\u65b0\u6d41\uff0c\u8fd8\u53ef\u4ee5\u7ee7\u7eed\u5199\u6570\u636e<\/td><\/tr><tr><td>close()<\/td><td>\u5173\u95ed\u6d41\uff0c\u91ca\u653e\u8d44\u6e90\uff0c\u4f46\u662f\u5728\u5173\u95ed\u4e4b\u524d\u4f1a\u5148\u5237\u65b0\u6d41\u3002\u4e00\u65e6\u5173\u95ed\uff0c\u5c31\u4e0d\u80fd\u518d\u5199\u6570\u636e<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<pre class=\"wp-block-code\"><code>package com.itheima.d6_char_stream;\n\nimport java.io.File;\nimport java.io.FileWriter;\nimport java.io.Writer;\n\n\/**\n     \u76ee\u6807\uff1a\u5b57\u7b26\u8f93\u51fa\u6d41\u7684\u4f7f\u7528\u3002\n\n     IO\u6d41\u7684\u4f53\u7cfb\uff1a\n            \u5b57\u8282\u6d41                                   \u5b57\u7b26\u6d41\n     \u5b57\u8282\u8f93\u5165\u6d41           \u5b57\u8282\u8f93\u51fa\u6d41               \u5b57\u7b26\u8f93\u5165\u6d41       \u5b57\u7b26\u8f93\u51fa\u6d41\n     InputStream         OutputStream           Reader         Writer     (\u62bd\u8c61\u7c7b)\n     FileInputStream     FileOutputStream       FileReader     FileWriter (\u5b9e\u73b0\u7c7b)\n\n     d.FileWriter\u6587\u4ef6\u5b57\u7b26\u8f93\u51fa\u6d41\u7684\u4f7f\u7528\u3002\n        -- \u4f5c\u7528\uff1a\u4ee5\u5185\u5b58\u4e3a\u57fa\u51c6\uff0c\u628a\u5185\u5b58\u4e2d\u7684\u6570\u636e\u6309\u7167\u5b57\u7b26\u7684\u5f62\u5f0f\u5199\u51fa\u5230\u78c1\u76d8\u6587\u4ef6\u4e2d\u53bb\u3002\n            \u7b80\u5355\u6765\u8bf4\uff0c\u5c31\u662f\u628a\u5185\u5b58\u7684\u6570\u636e\u4ee5\u5b57\u7b26\u5199\u51fa\u5230\u6587\u4ef6\u4e2d\u53bb\u3002\n        -- \u6784\u9020\u5668\uff1a\n           public FileWriter(File file):\u521b\u5efa\u4e00\u4e2a\u5b57\u7b26\u8f93\u51fa\u6d41\u7ba1\u9053\u901a\u5411\u76ee\u6807\u6587\u4ef6\u5bf9\u8c61\u3002\n           public FileWriter(String filePath):\u521b\u5efa\u4e00\u4e2a\u5b57\u7b26\u8f93\u51fa\u6d41\u7ba1\u9053\u901a\u5411\u76ee\u6807\u6587\u4ef6\u8def\u5f84\u3002\n           public FileWriter(File file,boolean append):\u521b\u5efa\u4e00\u4e2a\u8ffd\u52a0\u6570\u636e\u7684\u5b57\u7b26\u8f93\u51fa\u6d41\u7ba1\u9053\u901a\u5411\u76ee\u6807\u6587\u4ef6\u5bf9\u8c61\u3002\n           public FileWriter(String filePath,boolean append):\u521b\u5efa\u4e00\u4e2a\u8ffd\u52a0\u6570\u636e\u7684\u5b57\u7b26\u8f93\u51fa\u6d41\u7ba1\u9053\u901a\u5411\u76ee\u6807\u6587\u4ef6\u8def\u5f84\u3002\n        -- \u65b9\u6cd5\uff1a\n             a.public void write(int c):\u5199\u4e00\u4e2a\u5b57\u7b26\u51fa\u53bb\n             b.public void write(String c)\u5199\u4e00\u4e2a\u5b57\u7b26\u4e32\u51fa\u53bb\uff1a\n             c.public void write(char&#91;] buffer):\u5199\u4e00\u4e2a\u5b57\u7b26\u6570\u7ec4\u51fa\u53bb\n             d.public void write(String c ,int pos ,int len):\u5199\u5b57\u7b26\u4e32\u7684\u4e00\u90e8\u5206\u51fa\u53bb\n             e.public void write(char&#91;] buffer ,int pos ,int len):\u5199\u5b57\u7b26\u6570\u7ec4\u7684\u4e00\u90e8\u5206\u51fa\u53bb\n     \u5c0f\u7ed3\uff1a\n        \u5b57\u7b26\u8f93\u51fa\u6d41\u53ef\u4ee5\u5199\u5b57\u7b26\u6570\u636e\u51fa\u53bb\uff0c\u603b\u5171\u67095\u4e2a\u65b9\u6cd5\u5199\u5b57\u7b26\u3002\n        \u8986\u76d6\u7ba1\u9053\uff1a\n             Writer fw = new FileWriter(\"Day10Demo\/src\/dlei03.txt\"); \/\/ \u8986\u76d6\u6570\u636e\u7ba1\u9053\n        \u8ffd\u52a0\u6570\u636e\u7ba1\u9053\uff1a\n             Writer fw = new FileWriter(\"Day10Demo\/src\/dlei03.txt\",true); \/\/ \u8ffd\u52a0\u6570\u636e\u7ba1\u9053\n        \u6362\u884c\uff1a\n             fw.write(\"\\r\\n\"); \/\/ \u6362\u884c\n        \u7ed3\u8bba\uff1a\u8bfb\u5199\u5b57\u7b26\u6587\u4ef6\u6570\u636e\u5efa\u8bae\u4f7f\u7528\u5b57\u7b26\u6d41\u3002\u590d\u5236\u6587\u4ef6\u5efa\u8bae\u4f7f\u7528\u5b57\u8282\u6d41\u3002\n *\/\npublic class FileWriterDemo03 {\n    public static void main(String&#91;] args) throws Exception {\n        \/\/ 1\u3001\u521b\u5efa\u4e00\u4e2a\u5b57\u7b26\u8f93\u51fa\u6d41\u7ba1\u9053\u4e0e\u76ee\u6807\u6587\u4ef6\u63a5\u901a\n        \/\/ Writer fw = new FileWriter(\"file-io-app\/src\/out08.txt\"); \/\/ \u8986\u76d6\u7ba1\u9053\uff0c\u6bcf\u6b21\u542f\u52a8\u90fd\u4f1a\u6e05\u7a7a\u6587\u4ef6\u4e4b\u524d\u7684\u6570\u636e\n        Writer fw = new FileWriter(\"file-io-app\/src\/out08.txt\", true); \/\/ \u8986\u76d6\u7ba1\u9053\uff0c\u6bcf\u6b21\u542f\u52a8\u90fd\u4f1a\u6e05\u7a7a\u6587\u4ef6\u4e4b\u524d\u7684\u6570\u636e\n\n\/\/      a.public void write(int c):\u5199\u4e00\u4e2a\u5b57\u7b26\u51fa\u53bb\n        fw.write(98);\n        fw.write('a');\n        fw.write('\u5f90'); \/\/ \u4e0d\u4f1a\u51fa\u95ee\u9898\u4e86\n        fw.write(\"\\r\\n\"); \/\/ \u6362\u884c\n\n\/\/       b.public void write(String c)\u5199\u4e00\u4e2a\u5b57\u7b26\u4e32\u51fa\u53bb\n        fw.write(\"abc\u6211\u662f\u4e2d\u56fd\u4eba\");\n        fw.write(\"\\r\\n\"); \/\/ \u6362\u884c\n\n\n\/\/       c.public void write(char&#91;] buffer):\u5199\u4e00\u4e2a\u5b57\u7b26\u6570\u7ec4\u51fa\u53bb\n        char&#91;] chars = \"abc\u6211\u662f\u4e2d\u56fd\u4eba\".toCharArray();\n        fw.write(chars);\n        fw.write(\"\\r\\n\"); \/\/ \u6362\u884c\n\n\n\/\/       d.public void write(String c ,int pos ,int len):\u5199\u5b57\u7b26\u4e32\u7684\u4e00\u90e8\u5206\u51fa\u53bb\n        fw.write(\"abc\u6211\u662f\u4e2d\u56fd\u4eba\", 0, 5);\n        fw.write(\"\\r\\n\"); \/\/ \u6362\u884c\n\n\n\/\/       e.public void write(char&#91;] buffer ,int pos ,int len):\u5199\u5b57\u7b26\u6570\u7ec4\u7684\u4e00\u90e8\u5206\u51fa\u53bb\n        fw.write(chars, 3, 5);\n        fw.write(\"\\r\\n\"); \/\/ \u6362\u884c\n\n\n        \/\/ fw.flush();\/\/ \u5237\u65b0\u540e\u6d41\u53ef\u4ee5\u7ee7\u7eed\u4f7f\u7528\n        fw.close(); \/\/ \u5173\u95ed\u5305\u542b\u5237\u7ebf\uff0c\u5173\u95ed\u540e\u6d41\u4e0d\u80fd\u4f7f\u7528\n\n    }\n}\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u7f13\u51b2\u6d41<\/h3>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"471\" src=\"https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-7-1024x471.png\" alt=\"\" class=\"wp-image-656\" srcset=\"https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-7-1024x471.png 1024w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-7-300x138.png 300w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-7-768x353.png 768w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-7-1536x706.png 1536w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-7.png 1772w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u7f13\u51b2\u6d41\u6982\u8ff0<br>\u7f13\u51b2\u6d41\u4e5f\u79f0\u4e3a\u9ad8\u6548\u6d41\u3001\u6216\u8005\u9ad8\u7ea7\u6d41\u3002\u4e4b\u524d\u5b66\u4e60\u7684\u5b57\u8282\u6d41\u53ef\u4ee5\u79f0\u4e3a\u539f\u59cb\u6d41\u3002<br>\u4f5c\u7528\uff1a\u7f13\u51b2\u6d41\u81ea\u5e26\u7f13\u51b2\u533a\u3001\u53ef\u4ee5\u63d0\u9ad8\u539f\u59cb\u5b57\u8282\u6d41\u3001\u5b57\u7b26\u6d41\u8bfb\u5199\u6570\u636e\u7684\u6027\u80fd<br>\u5b57\u8282\u7f13\u51b2\u6d41\u6027\u80fd\u4f18\u5316\u539f\u7406\uff1a<br>\u5b57\u8282\u7f13\u51b2\u8f93\u5165\u6d41\u81ea\u5e26\u4e868KB\u7f13\u51b2\u6c60\uff0c\u4ee5\u540e\u6211\u4eec\u76f4\u63a5\u4ece\u7f13\u51b2\u6c60\u8bfb\u53d6\u6570\u636e\uff0c\u6240\u4ee5\u6027\u80fd\u8f83\u597d\u3002<br>\u5b57\u8282\u7f13\u51b2\u8f93\u51fa\u6d41\u81ea\u5e26\u4e868KB\u7f13\u51b2\u6c60\uff0c\u6570\u636e\u5c31\u76f4\u63a5\u5199\u5165\u5230\u7f13\u51b2\u6c60\u4e2d\u53bb\uff0c\u5199\u6570\u636e\u6027\u80fd\u6781\u9ad8\u4e86\u3002<\/p>\n\n\n\n<p>\u5b57\u8282\u7f13\u51b2\u6d41<br>\u5b57\u8282\u7f13\u51b2\u8f93\u5165\u6d41\uff1aBufferedInputStream\uff0c\u63d0\u9ad8\u5b57\u8282\u8f93\u5165\u6d41\u8bfb\u53d6\u6570\u636e\u7684\u6027\u80fd\u3002<br>\u5b57\u8282\u7f13\u51b2\u8f93\u51fa\u6d41\uff1aBufferedOutputStream\uff0c\u63d0\u9ad8\u5b57\u8282\u8f93\u51fa\u6d41\u8bfb\u53d6\u6570\u636e\u7684\u6027\u80fd\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u6784\u9020\u5668<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>public&nbsp;BufferedInputStream\u200b(InputStream&nbsp;is)<\/td><td>\u53ef\u4ee5\u628a\u4f4e\u7ea7\u7684\u5b57\u8282\u8f93\u5165\u6d41\u5305\u88c5\u6210\u4e00\u4e2a\u9ad8\u7ea7\u7684\u7f13\u51b2\u5b57\u8282\u8f93\u5165\u6d41\u7ba1\u9053\uff0c\u4ece\u800c\u63d0\u9ad8\u5b57\u8282\u8f93\u5165\u6d41\u8bfb\u6570\u636e\u7684\u6027\u80fd<\/td><\/tr><tr><td>public&nbsp;BufferedOutputStream\u200b(OutputStream&nbsp;os)<\/td><td>\u53ef\u4ee5\u628a\u4f4e\u7ea7\u7684\u5b57\u8282\u8f93\u51fa\u6d41\u5305\u88c5\u6210\u4e00\u4e2a\u9ad8\u7ea7\u7684\u7f13\u51b2\u5b57\u8282\u8f93\u51fa\u6d41\uff0c\u4ece\u800c\u63d0\u9ad8\u5199\u6570\u636e\u7684\u6027\u80fd<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.io.*;\n\n\/**\n    \u76ee\u6807\uff1a\u4f7f\u7528\u5b57\u8282\u7f13\u51b2\u6d41\u5b8c\u6210\u6570\u636e\u7684\u8bfb\u5199\u64cd\u4f5c\u3002\n *\/\npublic class\n\nByteBufferDemo {\n    public static void main(String&#91;] args) {\n\n        try (\n                \/\/ \u8fd9\u91cc\u9762\u53ea\u80fd\u653e\u7f6e\u8d44\u6e90\u5bf9\u8c61\uff0c\u7528\u5b8c\u4f1a\u81ea\u52a8\u5173\u95ed\uff1a\u81ea\u52a8\u8c03\u7528\u8d44\u6e90\u5bf9\u8c61\u7684close\u65b9\u6cd5\u5173\u95ed\u8d44\u6e90\uff08\u5373\u4f7f\u51fa\u73b0\u5f02\u5e38\u4e5f\u4f1a\u505a\u5173\u95ed\u64cd\u4f5c\uff09\n                \/\/ 1\u3001\u521b\u5efa\u4e00\u4e2a\u5b57\u8282\u8f93\u5165\u6d41\u7ba1\u9053\u4e0e\u539f\u89c6\u9891\u63a5\u901a\n                InputStream is = new FileInputStream(\"D:\\\\resources\\\\newmeinv.jpeg\");\n                \/\/ a.\u628a\u539f\u59cb\u7684\u5b57\u8282\u8f93\u5165\u6d41\u5305\u88c5\u6210\u9ad8\u7ea7\u7684\u7f13\u51b2\u5b57\u8282\u8f93\u5165\u6d41\n                InputStream bis = new BufferedInputStream(is);\n                \/\/ 2\u3001\u521b\u5efa\u4e00\u4e2a\u5b57\u8282\u8f93\u51fa\u6d41\u7ba1\u9053\u4e0e\u76ee\u6807\u6587\u4ef6\u63a5\u901a\n                OutputStream os = new FileOutputStream(\"D:\\\\resources\\\\newmeinv222.jpeg\");\n                \/\/ b.\u628a\u5b57\u8282\u8f93\u51fa\u6d41\u7ba1\u9053\u5305\u88c5\u6210\u9ad8\u7ea7\u7684\u7f13\u51b2\u5b57\u8282\u8f93\u51fa\u6d41\u7ba1\u9053\n                OutputStream bos = new BufferedOutputStream(os);\n\n        ) {\n\n            \/\/ 3\u3001\u5b9a\u4e49\u4e00\u4e2a\u5b57\u8282\u6570\u7ec4\u8f6c\u79fb\u6570\u636e\n            byte&#91;] buffer = new byte&#91;1024];\n            int len; \/\/ \u8bb0\u5f55\u6bcf\u6b21\u8bfb\u53d6\u7684\u5b57\u8282\u6570\u3002\n            while ((len = bis.read(buffer)) != -1){\n                bos.write(buffer, 0 , len);\n            }\n            System.out.println(\"\u590d\u5236\u5b8c\u6210\u4e86\uff01\");\n\n        } catch (Exception e){\n            e.printStackTrace();\n        }\n\n    }\n}<\/code><\/pre>\n\n\n\n<p>\u5b57\u7b26\u7f13\u51b2\u8f93\u5165\u6d41<br>\u5b57\u7b26\u7f13\u51b2\u8f93\u5165\u6d41\uff1aBufferedReader\u3002<br>\u4f5c\u7528\uff1a\u63d0\u9ad8\u5b57\u7b26\u8f93\u5165\u6d41\u8bfb\u53d6\u6570\u636e\u7684\u6027\u80fd\uff0c\u9664\u6b64\u4e4b\u5916\u591a\u4e86\u6309\u7167\u884c\u8bfb\u53d6\u6570\u636e\u7684\u529f\u80fd\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u6784\u9020\u5668<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>public&nbsp;BufferedReader\u200b(Reader&nbsp;r)<\/td><td>\u53ef\u4ee5\u628a\u4f4e\u7ea7\u7684\u5b57\u7b26\u8f93\u5165\u6d41\u5305\u88c5\u6210\u4e00\u4e2a\u9ad8\u7ea7\u7684\u7f13\u51b2\u5b57\u7b26\u8f93\u5165\u6d41\u7ba1\u9053\uff0c\u4ece\u800c\u63d0\u9ad8\u5b57\u7b26\u8f93\u5165\u6d41\u8bfb\u6570\u636e\u7684\u6027\u80fd<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u5b57\u7b26\u7f13\u51b2\u8f93\u5165\u6d41\u65b0\u589e\u529f\u80fd<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u65b9\u6cd5<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>public&nbsp;String&nbsp;readLine()<\/td><td>\u8bfb\u53d6\u4e00\u884c\u6570\u636e\u8fd4\u56de\uff0c\u5982\u679c\u8bfb\u53d6\u6ca1\u6709\u5b8c\u6bd5\uff0c\u65e0\u884c\u53ef\u8bfb\u8fd4\u56denull<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.io.BufferedReader;\nimport java.io.FileReader;\nimport java.io.IOException;\nimport java.io.Reader;\n\n\/**\n    \u76ee\u6807\uff1a\u5b66\u4f1a\u4f7f\u7528\u7f13\u51b2\u5b57\u7b26\u8f93\u5165\u6d41\u63d0\u9ad8\u5b57\u7b26\u8f93\u5165\u6d41\u7684\u6027\u80fd\uff0c\u65b0\u589e\u4e86\u6309\u7167\u884c\u8bfb\u53d6\u7684\u65b9\u6cd5(\u7ecf\u5178\u4ee3\u7801)\n *\/\npublic class BufferedReaderDemo1 {\n    public static void main(String&#91;] args) {\n        try (\n                \/\/ 1\u3001\u521b\u5efa\u4e00\u4e2a\u6587\u4ef6\u5b57\u7b26\u8f93\u5165\u6d41\u4e0e\u6e90\u6587\u4ef6\u63a5\u901a\u3002\n                Reader fr = new FileReader(\"io-app2\/src\/data01.txt\");\n                \/\/ a\u3001\u628a\u4f4e\u7ea7\u7684\u5b57\u7b26\u8f93\u5165\u6d41\u5305\u88c5\u6210\u9ad8\u7ea7\u7684\u7f13\u51b2\u5b57\u7b26\u8f93\u5165\u6d41\u3002\n                BufferedReader br = new BufferedReader(fr);\n                ){\n\n            \/\/ 2\u3001\u7528\u5faa\u73af\uff0c\u6bcf\u6b21\u8bfb\u53d6\u4e00\u4e2a\u5b57\u7b26\u6570\u7ec4\u7684\u6570\u636e\u3002  1024 + 1024 + 8\n\/\/            char&#91;] buffer = new char&#91;1024]; \/\/ 1K\u5b57\u7b26\n\/\/            int len;\n\/\/            while ((len = br.read(buffer)) != -1) {\n\/\/                String rs = new String(buffer, 0, len);\n\/\/                System.out.print(rs);\n\/\/            }\n\n              String line;\n              while ((line = br.readLine()) != null){\n                  System.out.println(line);\n              }\n        } catch (IOException e) {\n            e.printStackTrace();\n        }\n    }\n}<\/code><\/pre>\n\n\n\n<p>\u5b57\u7b26\u7f13\u51b2\u8f93\u51fa\u6d41<br>\u5b57\u7b26\u7f13\u51b2\u8f93\u51fa\u6d41\uff1aBufferedWriter\u3002<br>\u4f5c\u7528\uff1a\u63d0\u9ad8\u5b57\u7b26\u8f93\u51fa\u6d41\u5199\u53d6\u6570\u636e\u7684\u6027\u80fd\uff0c\u9664\u6b64\u4e4b\u5916\u591a\u4e86\u6362\u884c\u529f\u80fd<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u6784\u9020\u5668<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>public&nbsp;BufferedWriter\u200b(Writer&nbsp;w)<\/td><td>\u53ef\u4ee5\u628a\u4f4e\u7ea7\u7684\u5b57\u7b26\u8f93\u51fa\u6d41\u5305\u88c5\u6210\u4e00\u4e2a\u9ad8\u7ea7\u7684\u7f13\u51b2\u5b57\u7b26\u8f93\u51fa\u6d41\u7ba1\u9053\uff0c\u4ece\u800c\u63d0\u9ad8\u5b57\u7b26\u8f93\u51fa\u6d41\u5199\u6570\u636e\u7684\u6027\u80fd<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u5b57\u7b26\u7f13\u51b2\u8f93\u51fa\u6d41\u65b0\u589e\u529f\u80fd<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u65b9\u6cd5<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>public&nbsp;void&nbsp;newLine()<\/td><td>\u6362\u884c\u64cd\u4f5c<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.io.BufferedWriter;\nimport java.io.FileWriter;\nimport java.io.Writer;\n\n\/**\n     \u76ee\u6807\uff1a\u7f13\u51b2\u5b57\u7b26\u8f93\u51fa\u6d41\u7684\u4f7f\u7528\uff0c\u5b66\u4f1a\u5b83\u591a\u51fa\u6765\u7684\u4e00\u4e2a\u529f\u80fd\uff1anewLine();\n *\/\npublic class BufferedWriterDemo2 {\n    public static void main(String&#91;] args) throws Exception {\n        \/\/ 1\u3001\u521b\u5efa\u4e00\u4e2a\u5b57\u7b26\u8f93\u51fa\u6d41\u7ba1\u9053\u4e0e\u76ee\u6807\u6587\u4ef6\u63a5\u901a\n        Writer fw = new FileWriter(\"io-app2\/src\/out02.txt\"); \/\/ \u8986\u76d6\u7ba1\u9053\uff0c\u6bcf\u6b21\u542f\u52a8\u90fd\u4f1a\u6e05\u7a7a\u6587\u4ef6\u4e4b\u524d\u7684\u6570\u636e\n       \/\/Writer fw = new FileWriter(\"io-app2\/src\/out02.txt\", true); \/\/ \u8ffd\u52a0\u6570\u636e\n        BufferedWriter bw = new BufferedWriter(fw);\n\n\/\/      a.public void write(int c):\u5199\u4e00\u4e2a\u5b57\u7b26\u51fa\u53bb\n        bw.write(98);\n        bw.write('a');\n        bw.write('\u5f90'); \/\/ \u4e0d\u4f1a\u51fa\u95ee\u9898\u4e86\n        bw.newLine(); \/\/ bw.write(\"\\r\\n\"); \/\/ \u6362\u884c\n\n\/\/       b.public void write(String c)\u5199\u4e00\u4e2a\u5b57\u7b26\u4e32\u51fa\u53bb\n        bw.write(\"abc\u6211\u662f\u4e2d\u56fd\u4eba\");\n        bw.newLine(); \/\/ bw.write(\"\\r\\n\"); \/\/ \u6362\u884c\n\n\n\/\/       c.public void write(char&#91;] buffer):\u5199\u4e00\u4e2a\u5b57\u7b26\u6570\u7ec4\u51fa\u53bb\n        char&#91;] chars = \"abc\u6211\u662f\u4e2d\u56fd\u4eba\".toCharArray();\n        bw.write(chars);\n        bw.newLine(); \/\/ bw.write(\"\\r\\n\"); \/\/ \u6362\u884c\n\n\n\/\/       d.public void write(String c ,int pos ,int len):\u5199\u5b57\u7b26\u4e32\u7684\u4e00\u90e8\u5206\u51fa\u53bb\n        bw.write(\"abc\u6211\u662f\u4e2d\u56fd\u4eba\", 0, 5);\n        bw.newLine(); \/\/ bw.write(\"\\r\\n\"); \/\/ \u6362\u884c\n\n\/\/       e.public void write(char&#91;] buffer ,int pos ,int len):\u5199\u5b57\u7b26\u6570\u7ec4\u7684\u4e00\u90e8\u5206\u51fa\u53bb\n        bw.write(chars, 3, 5);\n        bw.newLine(); \/\/ bw.write(\"\\r\\n\"); \/\/ \u6362\u884c\n\n\n        \/\/ fw.flush();\/\/ \u5237\u65b0\u540e\u6d41\u53ef\u4ee5\u7ee7\u7eed\u4f7f\u7528\n        bw.close(); \/\/ \u5173\u95ed\u5305\u542b\u5237\u7ebf\uff0c\u5173\u95ed\u540e\u6d41\u4e0d\u80fd\u4f7f\u7528\n\n    }\n}<\/code><\/pre>\n\n\n\n<p>\u590d\u5236\u64cd\u4f5c<\/p>\n\n\n\n<p>\u62f7\u8d1d\u51fa\u5e08\u8868\u5230\u53e6\u4e00\u4e2a\u6587\u4ef6\uff0c\u6062\u590d\u987a\u5e8f<br>\u9700\u6c42\uff1a\u628a\u300a\u51fa\u5e08\u8868\u300b\u7684\u6587\u7ae0\u987a\u5e8f\u8fdb\u884c\u6062\u590d\u5230\u4e00\u4e2a\u65b0\u6587\u4ef6\u4e2d\u3002<br>\u5206\u6790\uff1a<br>\u5b9a\u4e49\u4e00\u4e2a\u7f13\u5b58\u5b57\u7b26\u8f93\u5165\u6d41\u7ba1\u9053\u4e0e\u6e90\u6587\u4ef6\u63a5\u901a\u3002<br>\u5b9a\u4e49\u4e00\u4e2aList\u96c6\u5408\u5b58\u50a8\u8bfb\u53d6\u7684\u6bcf\u884c\u6570\u636e\u3002<br>\u5b9a\u4e49\u4e00\u4e2a\u5faa\u73af\u6309\u7167\u884c\u8bfb\u53d6\u6570\u636e\uff0c\u5b58\u5165\u5230List\u96c6\u5408\u4e2d\u53bb\u3002<br>\u5bf9List\u96c6\u5408\u4e2d\u7684\u6bcf\u884c\u6570\u636e\u6309\u7167\u9996\u5b57\u7b26\u7f16\u53f7\u5347\u5e8f\u6392\u5e8f\u3002<br>\u5b9a\u4e49\u4e00\u4e2a\u7f13\u5b58\u5b57\u7b26\u8f93\u51fa\u7ba1\u9053\u4e0e\u76ee\u6807\u6587\u4ef6\u63a5\u901a\u3002<br>\u904d\u5386List\u96c6\u5408\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\uff0c\u7528\u7f13\u51b2\u8f93\u51fa\u7ba1\u9053\u5199\u51fa\u5e76\u6362\u884c\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.io.*;\nimport java.util.*;\n\n\/**\n   \u76ee\u6807\uff1a\u5b8c\u6210\u51fa\u5e08\u8868\u987a\u5e8f\u7684\u6062\u590d\uff0c\u5e76\u5b58\u5165\u5230\u53e6\u4e00\u4e2a\u65b0\u6587\u4ef6\u4e2d\u53bb\u3002\n *\/\npublic class BufferedCharTest3 {\n    public static void main(String&#91;] args) {\n        try(\n                \/\/ 1\u3001\u521b\u5efa\u7f13\u51b2\u5b57\u7b26\u8f93\u5165\u6d41\u7ba1\u9053\u4e0e\u6e90\u6587\u4ef6\u63a5\u901a\n                BufferedReader br = new BufferedReader(new FileReader(\"io-app2\/src\/csb.txt\"));\n\n                \/\/ 5\u3001\u5b9a\u4e49\u7f13\u51b2\u5b57\u7b26\u8f93\u51fa\u7ba1\u9053\u4e0e\u76ee\u6807\u6587\u4ef6\u63a5\u901a\n                BufferedWriter bw = new BufferedWriter(new FileWriter(\"io-app2\/src\/new.txt\"));\n                ) {\n\n            \/\/ 2\u3001\u5b9a\u4e49\u4e00\u4e2aList\u96c6\u5408\u5b58\u50a8\u6bcf\u884c\u5185\u5bb9\n            List&lt;String&gt; data = new ArrayList&lt;&gt;();\n            \/\/ 3\u3001\u5b9a\u4e49\u5faa\u73af\uff0c\u6309\u7167\u884c\u8bfb\u53d6\u6587\u7ae0\n            String line;\n            while ((line = br.readLine()) != null){\n                data.add(line);\n            }\n            System.out.println(data);\n\n            \/\/ 4\u3001\u6392\u5e8f\n            \/\/ \u81ea\u5b9a\u4e49\u6392\u5e8f\u89c4\u5219\n            List&lt;String&gt; sizes = new ArrayList&lt;&gt;();\n            Collections.addAll(sizes, \"\u4e00\",\"\u4e8c\",\"\u4e09\",\"\u56db\",\"\u4e94\",\"\u9646\",\"\u67d2\",\"\u516b\",\"\u4e5d\",\"\u5341\",\"\u5341\u4e00\");\n\n            Collections.sort(data, new Comparator&lt;String&gt;() {\n                @Override\n                public int compare(String o1, String o2) {\n                    \/\/ o1   \u516b.,....\n                    \/\/ o2   \u67d2.,....\n                    return sizes.indexOf(o1.substring(0, o1.indexOf(\".\")))\n                            - sizes.indexOf(o2.substring(0, o2.indexOf(\".\")));\n                }\n            });\n            System.out.println(data);\n\n            \/\/ 6\u3001\u904d\u5386\u96c6\u5408\u4e2d\u7684\u6bcf\u884c\u6587\u7ae0\u5199\u51fa\u53bb\uff0c\u4e14\u8981\u6362\u884c\n            for (String datum : data) {\n                bw.write(datum);\n                bw.newLine(); \/\/ \u6362\u884c\n            }\n\n        } catch (Exception e) {\n            e.printStackTrace();\n        }\n    }\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u8f6c\u6362\u6d41<\/h3>\n\n\n\n<p>\u00b7\u4e4b\u524d\u6211\u4eec\u4f7f\u7528\u5b57\u7b26\u6d41\u8bfb\u53d6\u4e2d\u6587\u662f\u5426\u6709\u4e71\u7801\uff1f<br>\u6ca1\u6709\u7684\uff0c\u56e0\u4e3a\u4ee3\u7801\u7f16\u7801\u548c\u6587\u4ef6\u7f16\u7801\u90fd\u662fUTF-8\u3002<br>\u00b7\u5982\u679c\u4ee3\u7801\u7f16\u7801\u548c\u6587\u4ef6\u7f16\u7801\u4e0d\u4e00\u81f4\uff0c\u4f7f\u7528\u5b57\u7b26\u6d41\u76f4\u63a5\u8bfb\u53d6\u8fd8\u80fd\u4e0d\u4e71\u7801\u5417\uff1f<br>\u4f1a\u4e71\u7801\u3002<br>\u6587\u4ef6\u7f16\u7801\u548c\u8bfb\u53d6\u7684\u7f16\u7801\u5fc5\u987b\u4e00\u81f4\u624d\u4e0d\u4f1a\u4e71\u7801\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-8-1024x397.png\" alt=\"\" class=\"wp-image-658\" width=\"840\" height=\"325\" srcset=\"https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-8-1024x397.png 1024w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-8-300x116.png 300w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-8-768x298.png 768w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-8-1536x596.png 1536w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-8.png 1647w\" sizes=\"auto, (max-width: 840px) 100vw, 840px\" \/><\/figure>\n\n\n\n<p>\u5b57\u7b26\u8f93\u5165\u8f6c\u6362\u6d41<br>\u5b57\u7b26\u8f93\u5165\u8f6c\u6362\u6d41\uff1aInputStreamReader\uff0c\u53ef\u4ee5\u628a\u539f\u59cb\u7684\u5b57\u8282\u6d41\u6309\u7167\u6307\u5b9a\u7f16\u7801\u8f6c\u6362\u6210\u5b57\u7b26\u8f93\u5165\u6d41\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u6784\u9020\u5668<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>public&nbsp;InputStreamReader(InputStream&nbsp;is)<\/td><td>\u53ef\u4ee5\u628a\u539f\u59cb\u7684\u5b57\u8282\u6d41\u6309\u7167\u4ee3\u7801\u9ed8\u8ba4\u7f16\u7801\u8f6c\u6362\u6210\u5b57\u7b26\u8f93\u5165\u6d41\u3002\u51e0\u4e4e\u4e0d\u7528\uff0c\u4e0e\u9ed8\u8ba4\u7684FileReader\u4e00\u6837\u3002<\/td><\/tr><tr><td>public&nbsp;InputStreamReader(InputStream&nbsp;is&nbsp;\uff0cString&nbsp;charset)<\/td><td>\u53ef\u4ee5\u628a\u539f\u59cb\u7684\u5b57\u8282\u6d41\u6309\u7167\u6307\u5b9a\u7f16\u7801\u8f6c\u6362\u6210\u5b57\u7b26\u8f93\u5165\u6d41\uff0c\u8fd9\u6837\u5b57\u7b26\u6d41\u4e2d\u7684\u5b57\u7b26\u5c31\u4e0d\u4e71\u7801\u4e86(\u91cd\u70b9)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.io.*;\n\n\/**\n     \u76ee\u6807\uff1a\u5b57\u7b26\u8f93\u5165\u8f6c\u6362\u6d41InputStreamReader\u7684\u4f7f\u7528\u3002\n\n             \u5b57\u8282\u6d41                                     \u5b57\u7b26\u6d41\n     \u5b57\u8282\u8f93\u5165\u6d41               \u5b57\u8282\u8f93\u51fa\u6d41              \u5b57\u7b26\u8f93\u5165\u6d41            \u5b57\u7b26\u8f93\u51fa\u6d41\n     InputStream             OutputStream          Reader               Writer   (\u62bd\u8c61\u7c7b)\n     FileInputStream         FileOutputStream      FileReader           FileWriter(\u5b9e\u73b0\u7c7b)\n     BufferedInputStream     BufferedOutputStream  BufferedReader       BufferedWriter(\u5b9e\u73b0\u7c7b\uff0c\u7f13\u51b2\u6d41)\n                                                   InputStreamReader    OutputStreamWriter\n     \u5b57\u7b26\u8f93\u5165\u8f6c\u6362\u6d41InputStreamReader:\n          -- \u4f5c\u7528\uff1a\u53ef\u4ee5\u89e3\u51b3\u5b57\u7b26\u6d41\u8bfb\u53d6\u4e0d\u540c\u7f16\u7801\u4e71\u7801\u7684\u95ee\u9898\u3002\n                  \u4e5f\u53ef\u4ee5\u628a\u539f\u59cb\u7684\u5b57\u8282\u6d41\u6309\u7167\u6307\u5b9a\u7f16\u7801\u8f6c\u6362\u6210\u5b57\u7b26\u8f93\u5165\u6d41\n\n          -- \u6784\u9020\u5668\uff1a\n                public InputStreamReader(InputStream is)\uff1a\u53ef\u4ee5\u4f7f\u7528\u5f53\u524d\u4ee3\u7801\u9ed8\u8ba4\u7f16\u7801\u8f6c\u6362\u6210\u5b57\u7b26\u6d41\uff0c\u51e0\u4e4e\u4e0d\u7528\uff01\n                public InputStreamReader(InputStream is,String charset):\u53ef\u4ee5\u6307\u5b9a\u7f16\u7801\u628a\u5b57\u8282\u6d41\u8f6c\u6362\u6210\u5b57\u7b26\u6d41(\u6838\u5fc3)\n\n     \u5c0f\u7ed3\uff1a\n        \u5b57\u7b26\u8f93\u5165\u8f6c\u6362\u6d41InputStreamReader:\u4f5c\u7528\uff1a\u53ef\u4ee5\u89e3\u51b3\u5b57\u7b26\u6d41\u8bfb\u53d6\u4e0d\u540c\u7f16\u7801\u4e71\u7801\u7684\u95ee\u9898\u3002\n        public InputStreamReader(InputStream is,String charset):\u53ef\u4ee5\u6307\u5b9a\u7f16\u7801\u628a\u5b57\u8282\u6d41\u8f6c\u6362\u6210\u5b57\u7b26\u6d41(\u6838\u5fc3)\n *\/\npublic class InputStreamReaderDemo01 {\n    public static void main(String&#91;] args) throws Exception {\n        \/\/ \u4ee3\u7801UTF-8   \u6587\u4ef6 GBK  \"D:\\\\resources\\\\data.txt\"\n        \/\/ 1\u3001\u63d0\u53d6GBK\u6587\u4ef6\u7684\u539f\u59cb\u5b57\u8282\u6d41\u3002   abc \u6211\n        \/\/                            ooo oo\n        InputStream is = new FileInputStream(\"D:\\\\resources\\\\data.txt\");\n        \/\/ 2\u3001\u628a\u539f\u59cb\u5b57\u8282\u6d41\u8f6c\u6362\u6210\u5b57\u7b26\u8f93\u5165\u6d41\n        \/\/ Reader isr = new InputStreamReader(is); \/\/ \u9ed8\u8ba4\u4ee5UTF-8\u7684\u65b9\u5f0f\u8f6c\u6362\u6210\u5b57\u7b26\u6d41\u3002 \u8fd8\u662f\u4f1a\u4e71\u7801\u7684  \u8ddf\u76f4\u63a5\u4f7f\u7528FileReader\u662f\u4e00\u6837\u7684\n        Reader isr = new InputStreamReader(is , \"GBK\"); \/\/ \u4ee5\u6307\u5b9a\u7684GBK\u7f16\u7801\u8f6c\u6362\u6210\u5b57\u7b26\u8f93\u5165\u6d41  \u5b8c\u7f8e\u7684\u89e3\u51b3\u4e86\u4e71\u7801\u95ee\u9898\n\n        BufferedReader br = new BufferedReader(isr);\n        String line;\n        while ((line = br.readLine()) != null){\n            System.out.println(line);\n        }\n    }\n}\n<\/code><\/pre>\n\n\n\n<p>\u5b57\u7b26\u8f93\u51fa\u8f6c\u6362\u6d41<br>\u5b57\u7b26\u8f93\u5165\u8f6c\u6362\u6d41\uff1aOutputStreamWriter\uff0c\u53ef\u4ee5\u628a\u5b57\u8282\u8f93\u51fa\u6d41\u6309\u7167\u6307\u5b9a\u7f16\u7801\u8f6c\u6362\u6210\u5b57\u7b26\u8f93\u51fa\u6d41\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u6784\u9020\u5668<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>public&nbsp;OutputStreamWriter(OutputStream&nbsp;os)<\/td><td>\u53ef\u4ee5\u628a\u539f\u59cb\u7684\u5b57\u8282\u8f93\u51fa\u6d41\u6309\u7167\u4ee3\u7801\u9ed8\u8ba4\u7f16\u7801\u8f6c\u6362\u6210\u5b57\u7b26\u8f93\u51fa\u6d41\u3002\u51e0\u4e4e\u4e0d\u7528\u3002<\/td><\/tr><tr><td>public&nbsp;OutputStreamWriter(OutputStream&nbsp;os\uff0cString&nbsp;charset)<\/td><td>\u53ef\u4ee5\u628a\u539f\u59cb\u7684\u5b57\u8282\u8f93\u51fa\u6d41\u6309\u7167\u6307\u5b9a\u7f16\u7801\u8f6c\u6362\u6210\u5b57\u7b26\u8f93\u51fa\u6d41(\u91cd\u70b9)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.io.*;\nimport java.nio.Buffer;\n\n\/**\n     \u76ee\u6807\uff1a\u5b57\u7b26\u8f93\u51fa\u8f6c\u6362OutputStreamWriter\u6d41\u7684\u4f7f\u7528\u3002\n\n                \u5b57\u8282\u6d41                                         \u5b57\u7b26\u6d41\n     \u5b57\u8282\u8f93\u5165\u6d41               \u5b57\u8282\u8f93\u51fa\u6d41              \u5b57\u7b26\u8f93\u5165\u6d41            \u5b57\u7b26\u8f93\u51fa\u6d41\n     InputStream             OutputStream          Reader               Writer   (\u62bd\u8c61\u7c7b)\n     FileInputStream         FileOutputStream      FileReader           FileWriter(\u5b9e\u73b0\u7c7b)\n     BufferedInputStream     BufferedOutputStream  BufferedReader       BufferedWriter(\u5b9e\u73b0\u7c7b\uff0c\u7f13\u51b2\u6d41)\n                                                   InputStreamReader    OutputStreamWriter\n\n     \u5b57\u7b26\u8f93\u51fa\u8f6c\u6362\u6d41\uff1aOutputStreamWriter\n           -- \u4f5c\u7528\uff1a\u53ef\u4ee5\u6307\u5b9a\u7f16\u7801\u628a\u5b57\u8282\u8f93\u51fa\u6d41\u8f6c\u6362\u6210\u5b57\u7b26\u8f93\u51fa\u6d41\u3002\n                   \u53ef\u4ee5\u6307\u5b9a\u5199\u51fa\u53bb\u7684\u5b57\u7b26\u7684\u7f16\u7801\u3002\n           -- \u6784\u9020\u5668\uff1a\n                public OutputStreamWriter(OutputStream os) :   \u7528\u5f53\u524d\u9ed8\u8ba4\u7f16\u7801UTF-8\u628a\u5b57\u8282\u8f93\u51fa\u6d41\u8f6c\u6362\u6210\u5b57\u7b26\u8f93\u51fa\u6d41\n                public OutputStreamWriter(OutputStream os , String charset):\u6307\u5b9a\u7f16\u7801\u628a\u5b57\u8282\u8f93\u51fa\u6d41\u8f6c\u6362\u6210\u5b57\u7b26\u8f93\u51fa\u6d41\n     \u5c0f\u7ed3\uff1a\n        \u5b57\u7b26\u8f93\u51fa\u8f6c\u6362\u6d41OutputStreamWriter\u53ef\u4ee5\u6307\u5b9a\u7f16\u7801\u628a\u5b57\u8282\u8f93\u51fa\u6d41\u8f6c\u6362\u6210\u5b57\u7b26\u8f93\u51fa\u6d41\u3002\n        \u4ece\u800c\u5b9e\u73b0\u6307\u5b9a\u5199\u51fa\u53bb\u7684\u5b57\u7b26\u7f16\u7801\uff01\n *\/\npublic class OutputStreamWriterDemo02 {\n    public static void main(String&#91;] args) throws Exception {\n        \/\/ 1\u3001\u5b9a\u4e49\u4e00\u4e2a\u5b57\u8282\u8f93\u51fa\u6d41\n        OutputStream os = new FileOutputStream(\"io-app2\/src\/out03.txt\");\n\n        \/\/ 2\u3001\u628a\u539f\u59cb\u7684\u5b57\u8282\u8f93\u51fa\u6d41\u8f6c\u6362\u6210\u5b57\u7b26\u8f93\u51fa\u6d41\n        \/\/ Writer osw = new OutputStreamWriter(os); \/\/ \u4ee5\u9ed8\u8ba4\u7684UTF-8\u5199\u5b57\u7b26\u51fa\u53bb \u8ddf\u76f4\u63a5\u5199FileWriter\u4e00\u6837\n        Writer osw = new OutputStreamWriter(os , \"GBK\"); \/\/ \u6307\u5b9aGBK\u7684\u65b9\u5f0f\u5199\u5b57\u7b26\u51fa\u53bb\n\n        \/\/ 3\u3001\u628a\u4f4e\u7ea7\u7684\u5b57\u7b26\u8f93\u51fa\u6d41\u5305\u88c5\u6210\u9ad8\u7ea7\u7684\u7f13\u51b2\u5b57\u7b26\u8f93\u51fa\u6d41\u3002\n        BufferedWriter bw = new BufferedWriter(osw);\n\n        bw.write(\"\u6211\u7231\u4e2d\u56fd1~~\");\n        bw.write(\"\u6211\u7231\u4e2d\u56fd2~~\");\n        bw.write(\"\u6211\u7231\u4e2d\u56fd3~~\");\n\n        bw.close();\n    }\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u5e8f\u5217\u5316\u5bf9\u8c61<\/h3>\n\n\n\n<p>\u5bf9\u8c61\u5e8f\u5217\u5316\uff1a<br>\u4f5c\u7528\uff1a\u4ee5\u5185\u5b58\u4e3a\u57fa\u51c6\uff0c\u628a\u5185\u5b58\u4e2d\u7684\u5bf9\u8c61\u5b58\u50a8\u5230\u78c1\u76d8\u6587\u4ef6\u4e2d\u53bb\uff0c\u79f0\u4e3a\u5bf9\u8c61\u5e8f\u5217\u5316\u3002<br>\u4f7f\u7528\u5230\u7684\u6d41\u662f\u5bf9\u8c61\u5b57\u8282\u8f93\u51fa\u6d41\uff1aObjectOutputStream<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"439\" src=\"https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-9-1024x439.png\" alt=\"\" class=\"wp-image-659\" srcset=\"https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-9-1024x439.png 1024w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-9-300x129.png 300w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-9-768x329.png 768w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-9-1536x659.png 1536w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-9.png 1639w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u5bf9\u8c61\u5e8f\u5217\u5316\uff1a<br>\u4f7f\u7528\u5230\u7684\u6d41\u662f\u5bf9\u8c61\u5b57\u8282\u8f93\u51fa\u6d41\uff1aObjectOutputStream<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u6784\u9020\u5668<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>public&nbsp;ObjectOutputStream(OutputStream&nbsp;out)<\/td><td>\u628a\u4f4e\u7ea7\u5b57\u8282\u8f93\u51fa\u6d41\u5305\u88c5\u6210\u9ad8\u7ea7\u7684\u5bf9\u8c61\u5b57\u8282\u8f93\u51fa\u6d41<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>ObjectOutputStream\u5e8f\u5217\u5316\u65b9\u6cd5<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u65b9\u6cd5\u540d\u79f0<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>public&nbsp;final&nbsp;void&nbsp;writeObject(Object&nbsp;obj)<\/td><td>\u628a\u5bf9\u8c61\u5199\u51fa\u53bb\u5230\u5bf9\u8c61\u5e8f\u5217\u5316\u6d41\u7684\u6587\u4ef6\u4e2d\u53bb<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u5bf9\u8c61\u53cd\u5e8f\u5217\u5316\uff1a<br>\u4f7f\u7528\u5230\u7684\u6d41\u662f\u5bf9\u8c61\u5b57\u8282\u8f93\u5165\u6d41\uff1aObjectInputStream<br>\u4f5c\u7528\uff1a\u4ee5\u5185\u5b58\u4e3a\u57fa\u51c6\uff0c\u628a\u5b58\u50a8\u5230\u78c1\u76d8\u6587\u4ef6\u4e2d\u53bb\u7684\u5bf9\u8c61\u6570\u636e\u6062\u590d\u6210\u5185\u5b58\u4e2d\u7684\u5bf9\u8c61\uff0c\u79f0\u4e3a\u5bf9\u8c61\u53cd\u5e8f\u5217\u5316<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u6784\u9020\u5668<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>public&nbsp;ObjectInputStream(InputStream&nbsp;out)<\/td><td>\u628a\u4f4e\u7ea7\u5b57\u8282\u8f93\u5982\u6d41\u5305\u88c5\u6210\u9ad8\u7ea7\u7684\u5bf9\u8c61\u5b57\u8282\u8f93\u5165\u6d41<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>ObjectInputStream\u5e8f\u5217\u5316\u65b9\u6cd5<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u65b9\u6cd5\u540d\u79f0<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>public&nbsp;Object&nbsp;readObject()<\/td><td>\u628a\u5b58\u50a8\u5230\u78c1\u76d8\u6587\u4ef6\u4e2d\u53bb\u7684\u5bf9\u8c61\u6570\u636e\u6062\u590d\u6210\u5185\u5b58\u4e2d\u7684\u5bf9\u8c61\u8fd4\u56de<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.io.FileOutputStream;\nimport java.io.ObjectOutputStream;\nimport java.io.PrintStream;\n\n\/**\n     \u76ee\u6807\uff1a\u5b66\u4f1a\u5bf9\u8c61\u5e8f\u5217\u5316\uff0c\u4f7f\u7528 ObjectOutputStream \u628a\u5185\u5b58\u4e2d\u7684\u5bf9\u8c61\u5b58\u5165\u5230\u78c1\u76d8\u6587\u4ef6\u4e2d\u3002\n\n     transient\u4fee\u9970\u7684\u6210\u5458\u53d8\u91cf\u4e0d\u53c2\u4e0e\u5e8f\u5217\u5316\u4e86\n     \u5bf9\u8c61\u5982\u679c\u8981\u5e8f\u5217\u5316\uff0c\u5fc5\u987b\u5b9e\u73b0Serializable\u5e8f\u5217\u5316\u63a5\u53e3\u3002\n\n     \u7533\u660e\u5e8f\u5217\u5316\u7684\u7248\u672c\u53f7\u7801\n     \u5e8f\u5217\u5316\u7684\u7248\u672c\u53f7\u4e0e\u53cd\u5e8f\u5217\u5316\u7684\u7248\u672c\u53f7\u5fc5\u987b\u4e00\u81f4\u624d\u4e0d\u4f1a\u51fa\u9519\uff01\n     private static final long serialVersionUID = 1;\n *\/\npublic class ObjectOutputStreamDemo1 {\n    public static void main(String&#91;] args) throws Exception {\n        \/\/ 1\u3001\u521b\u5efa\u5b66\u751f\u5bf9\u8c61\n        Student s = new Student(\"\u9648\u78ca\", \"chenlei\",\"1314520\", 21);\n\n        \/\/ 2\u3001\u5bf9\u8c61\u5e8f\u5217\u5316\uff1a\u4f7f\u7528\u5bf9\u8c61\u5b57\u8282\u8f93\u51fa\u6d41\u5305\u88c5\u5b57\u8282\u8f93\u51fa\u6d41\u7ba1\u9053\n        ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(\"io-app2\/src\/obj.txt\"));\n\n        \/\/ 3\u3001\u76f4\u63a5\u8c03\u7528\u5e8f\u5217\u5316\u65b9\u6cd5\n        oos.writeObject(s);\n\n        \/\/ 4\u3001\u91ca\u653e\u8d44\u6e90\n        oos.close();\n        System.out.println(\"\u5e8f\u5217\u5316\u5b8c\u6210\u4e86~~\");\n\n    }\n}\n\nimport java.io.FileInputStream;\nimport java.io.FileNotFoundException;\nimport java.io.ObjectInputStream;\n\n\/**\n    \u76ee\u6807\uff1a\u5b66\u4f1a\u8fdb\u884c\u5bf9\u8c61\u53cd\u5e8f\u5217\u5316\uff1a\u4f7f\u7528\u5bf9\u8c61\u5b57\u8282\u8f93\u5165\u6d41\u628a\u6587\u4ef6\u4e2d\u7684\u5bf9\u8c61\u6570\u636e\u6062\u590d\u6210\u5185\u5b58\u4e2d\u7684Java\u5bf9\u8c61\u3002\n *\/\npublic class ObjectInputStreamDemo2 {\n    public static void main(String&#91;] args) throws Exception {\n        \/\/ 1\u3001\u521b\u5efa\u5bf9\u8c61\u5b57\u8282\u8f93\u5165\u6d41\u7ba1\u9053\u5305\u88c5\u4f4e\u7ea7\u7684\u5b57\u8282\u8f93\u5165\u6d41\u7ba1\u9053\n        ObjectInputStream is = new ObjectInputStream(new FileInputStream(\"io-app2\/src\/obj.txt\"));\n\n        \/\/ 2\u3001\u8c03\u7528\u5bf9\u8c61\u5b57\u8282\u8f93\u5165\u6d41\u7684\u53cd\u5e8f\u5217\u5316\u65b9\u6cd5\n        Student s = (Student) is.readObject();\n\n        System.out.println(s);\n    }\n}\n\nimport java.io.Serializable;\n\n\/**\n  \u5bf9\u8c61\u5982\u679c\u8981\u5e8f\u5217\u5316\uff0c\u5fc5\u987b\u5b9e\u73b0Serializable\u5e8f\u5217\u5316\u63a5\u53e3\u3002\n *\/\npublic class Student implements Serializable {\n    \/\/ \u7533\u660e\u5e8f\u5217\u5316\u7684\u7248\u672c\u53f7\u7801\n    \/\/ \u5e8f\u5217\u5316\u7684\u7248\u672c\u53f7\u4e0e\u53cd\u5e8f\u5217\u5316\u7684\u7248\u672c\u53f7\u5fc5\u987b\u4e00\u81f4\u624d\u4e0d\u4f1a\u51fa\u9519\uff01\n    private static final long serialVersionUID = 1;\n    private String name;\n    private String loginName;\n    \/\/ transient\u4fee\u9970\u7684\u6210\u5458\u53d8\u91cf\u4e0d\u53c2\u4e0e\u5e8f\u5217\u5316\u4e86\n    private transient String passWord;\n    private int age ;\n\n    public Student(){\n    }\n\n    public Student(String name, String loginName, String passWord, int age) {\n        this.name = name;\n        this.loginName = loginName;\n        this.passWord = passWord;\n        this.age = age;\n    }\n\n    public String getName() {\n        return name;\n    }\n\n    public void setName(String name) {\n        this.name = name;\n    }\n\n    public String getLoginName() {\n        return loginName;\n    }\n\n    public void setLoginName(String loginName) {\n        this.loginName = loginName;\n    }\n\n    public String getPassWord() {\n        return passWord;\n    }\n\n    public void setPassWord(String passWord) {\n        this.passWord = passWord;\n    }\n\n    public int getAge() {\n        return age;\n    }\n\n    public void setAge(int age) {\n        this.age = age;\n    }\n\n    @Override\n    public String toString() {\n        return \"Student{\" +\n                \"name='\" + name + '\\'' +\n                \", loginName='\" + loginName + '\\'' +\n                \", passWord='\" + passWord + '\\'' +\n                \", age=\" + age +\n                '}';\n    }\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u6253\u5370\u6d41<\/h3>\n\n\n\n<p>\u4f5c\u7528\uff1a\u6253\u5370\u6d41\u53ef\u4ee5\u5b9e\u73b0\u65b9\u4fbf\u3001\u9ad8\u6548\u7684\u6253\u5370\u6570\u636e\u5230\u6587\u4ef6\u4e2d\u53bb\u3002\u6253\u5370\u6d41\u4e00\u822c\u662f\u6307\uff1aPrintStream\uff0cPrintWriter\u4e24\u4e2a\u7c7b\u3002<br>\u53ef\u4ee5\u5b9e\u73b0\u6253\u5370\u4ec0\u4e48\u6570\u636e\u5c31\u662f\u4ec0\u4e48\u6570\u636e\uff0c\u4f8b\u5982\u6253\u5370\u6574\u657097\u5199\u51fa\u53bb\u5c31\u662f97\uff0c\u6253\u5370boolean\u7684true\uff0c\u5199\u51fa\u53bb\u5c31\u662ftrue\u3002<\/p>\n\n\n\n<p>PrintStream<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u6784\u9020\u5668<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>public&nbsp;PrintStream(OutputStream&nbsp;os)<\/td><td>\u6253\u5370\u6d41\u76f4\u63a5\u901a\u5411\u5b57\u8282\u8f93\u51fa\u6d41\u7ba1\u9053<\/td><\/tr><tr><td>public&nbsp;PrintStream(File&nbsp;&nbsp;f)<\/td><td>\u6253\u5370\u6d41\u76f4\u63a5\u901a\u5411\u6587\u4ef6\u5bf9\u8c61<\/td><\/tr><tr><td>public&nbsp;PrintStream(String&nbsp;filepath)<\/td><td>\u6253\u5370\u6d41\u76f4\u63a5\u901a\u5411\u6587\u4ef6\u8def\u5f84<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u65b9\u6cd5<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>public&nbsp;void&nbsp;print(Xxx&nbsp;xx)<\/td><td>\u6253\u5370\u4efb\u610f\u7c7b\u578b\u7684\u6570\u636e\u51fa\u53bb<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>PrintWriter<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u6784\u9020\u5668<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>public&nbsp;PrintWriter(OutputStream&nbsp;os)<\/td><td>\u6253\u5370\u6d41\u76f4\u63a5\u901a\u5411\u5b57\u8282\u8f93\u51fa\u6d41\u7ba1\u9053<\/td><\/tr><tr><td>public&nbsp;PrintWriter&nbsp;(Writer&nbsp;w)<\/td><td>\u6253\u5370\u6d41\u76f4\u63a5\u901a\u5411\u5b57\u7b26\u8f93\u51fa\u6d41\u7ba1\u9053<\/td><\/tr><tr><td>public&nbsp;PrintWriter&nbsp;(File&nbsp;&nbsp;f)<\/td><td>\u6253\u5370\u6d41\u76f4\u63a5\u901a\u5411\u6587\u4ef6\u5bf9\u8c61<\/td><\/tr><tr><td>public&nbsp;PrintWriter&nbsp;(String&nbsp;filepath)<\/td><td>\u6253\u5370\u6d41\u76f4\u63a5\u901a\u5411\u6587\u4ef6\u8def\u5f84<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u65b9\u6cd5<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>public&nbsp;void&nbsp;print(Xxx&nbsp;xx)<\/td><td>\u6253\u5370\u4efb\u610f\u7c7b\u578b\u7684\u6570\u636e\u51fa\u53bb<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>PrintStream\u548cPrintWriter\u7684\u533a\u522b<br>\u6253\u5370\u6570\u636e\u529f\u80fd\u4e0a\u662f\u4e00\u6a21\u4e00\u6837\u7684\uff0c\u90fd\u662f\u4f7f\u7528\u65b9\u4fbf\uff0c\u6027\u80fd\u9ad8\u6548\uff08\u6838\u5fc3\u4f18\u52bf\uff09<br>PrintStream\u7ee7\u627f\u81ea\u5b57\u8282\u8f93\u51fa\u6d41OutputStream\uff0c\u652f\u6301\u5199\u5b57\u8282\u6570\u636e\u7684\u65b9\u6cd5\u3002<br>PrintWriter\u7ee7\u627f\u81ea\u5b57\u7b26\u8f93\u51fa\u6d41Writer\uff0c\u652f\u6301\u5199\u5b57\u7b26\u6570\u636e\u51fa\u53bb\u3002<\/p>\n\n\n\n<p>\u8f93\u51fa\u8bed\u53e5\u91cd\u5b9a\u5411<br>\u5c5e\u4e8e\u6253\u5370\u6d41\u7684\u4e00\u79cd\u5e94\u7528\uff0c\u53ef\u4ee5\u628a\u8f93\u51fa\u8bed\u53e5\u7684\u6253\u5370\u4f4d\u7f6e\u6539\u5230\u6587\u4ef6\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.io.FileNotFoundException;\r\nimport java.io.FileOutputStream;\r\nimport java.io.PrintStream;\r\nimport java.io.PrintWriter;\r\n\r\n\/**\r\n    \u76ee\u6807\uff1a\u5b66\u4f1a\u4f7f\u7528\u6253\u5370\u6d41 \u9ad8\u6548  \u65b9\u4fbf\u5199\u6570\u636e\u5230\u6587\u4ef6\u3002\r\n *\/\r\npublic class PrintDemo1 {\r\n    public static void main(String&#91;] args) throws Exception {\r\n        \/\/ 1\u3001\u521b\u5efa\u4e00\u4e2a\u6253\u5370\u6d41\u5bf9\u8c61\r\n\/\/        PrintStream ps = new PrintStream(new FileOutputStream(\"io-app2\/src\/ps.txt\"));\r\n\/\/        PrintStream ps = new PrintStream(new FileOutputStream(\"io-app2\/src\/ps.txt\" , true)); \/\/ \u8ffd\u52a0\u6570\u636e\uff0c\u5728\u4f4e\u7ea7\u7ba1\u9053\u540e\u9762\u52a0True\r\n\/\/        PrintStream ps = new PrintStream(\"io-app2\/src\/ps.txt\" );\r\n        PrintWriter ps = new PrintWriter(\"io-app2\/src\/ps.txt\"); \/\/ \u6253\u5370\u529f\u80fd\u4e0a\u4e0ePrintStream\u7684\u4f7f\u7528\u6ca1\u6709\u533a\u522b\r\n\r\n        ps.println(97);\r\n        ps.println('a');\r\n        ps.println(23.3);\r\n        ps.println(true);\r\n        ps.println(\"\u6211\u662f\u6253\u5370\u6d41\u8f93\u51fa\u7684\uff0c\u6211\u662f\u5565\u5c31\u6253\u5370\u5565\");\r\n\r\n        ps.close();\r\n    }\r\n}\r\nimport java.io.FileOutputStream;\r\nimport java.io.PrintStream;\r\n\r\n\/**\r\n    \u76ee\u6807\uff1a\u4e86\u89e3\u6539\u53d8\u8f93\u51fa\u8bed\u53e5\u7684\u4f4d\u7f6e\u5230\u6587\u4ef6\r\n *\/\r\npublic class PrintDemo2 {\r\n    public static void main(String&#91;] args) throws Exception {\r\n        System.out.println(\"\u9526\u745f\u65e0\u7aef\u4e94\u5341\u5f26\");\r\n        System.out.println(\"\u4e00\u5f26\u4e00\u67f1\u601d\u534e\u5e74\");\r\n\r\n        \/\/ \u6539\u53d8\u8f93\u51fa\u8bed\u53e5\u7684\u4f4d\u7f6e\uff08\u91cd\u5b9a\u5411\uff09\r\n        PrintStream ps = new PrintStream(\"io-app2\/src\/log.txt\");\r\n        System.setOut(ps); \/\/ \u628a\u7cfb\u7edf\u6253\u5370\u6d41\u6539\u6210\u6211\u4eec\u81ea\u5df1\u7684\u6253\u5370\u6d41\r\n\r\n        System.out.println(\"\u5e84\u751f\u6653\u68a6\u8ff7\u8774\u8776\");\r\n        System.out.println(\"\u671b\u5e1d\u6625\u5fc3\u6258\u675c\u9e43\");\r\n    }\r\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Properties<\/h3>\n\n\n\n<p>\u5176\u5b9e\u5c31\u662f\u4e00\u4e2aMap\u96c6\u5408\uff0c\u4f46\u662f\u6211\u4eec\u4e00\u822c\u4e0d\u4f1a\u5f53\u96c6\u5408\u4f7f\u7528\uff0c\u56e0\u4e3aHashMap\u66f4\u597d\u7528\u3002<\/p>\n\n\n\n<p>Properties\u6838\u5fc3\u4f5c\u7528\uff1a<br>Properties\u4ee3\u8868\u7684\u662f\u4e00\u4e2a\u5c5e\u6027\u6587\u4ef6\uff0c\u53ef\u4ee5\u628a\u81ea\u5df1\u5bf9\u8c61\u4e2d\u7684\u952e\u503c\u5bf9\u4fe1\u606f\u5b58\u5165\u5230\u4e00\u4e2a\u5c5e\u6027\u6587\u4ef6\u4e2d\u53bb\u3002<br>\u5c5e\u6027\u6587\u4ef6\uff1a\u540e\u7f00\u662f.properties\u7ed3\u5c3e\u7684\u6587\u4ef6,\u91cc\u9762\u7684\u5185\u5bb9\u90fd\u662f key=value\uff0c\u540e\u7eed\u505a\u7cfb\u7edf\u914d\u7f6e\u4fe1\u606f\u7684\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"288\" src=\"https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-10-1024x288.png\" alt=\"\" class=\"wp-image-661\" srcset=\"https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-10-1024x288.png 1024w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-10-300x84.png 300w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-10-768x216.png 768w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/01\/image-10.png 1377w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Properties\u548cIO\u6d41\u7ed3\u5408\u7684\u65b9\u6cd5\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u6784\u9020\u5668<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>void&nbsp;load\u200b(InputStream&nbsp;inStream)<\/td><td>\u4ece\u8f93\u5165\u5b57\u8282\u6d41\u8bfb\u53d6\u5c5e\u6027\u5217\u8868\uff08\u952e\u548c\u5143\u7d20\u5bf9\uff09<\/td><\/tr><tr><td>void&nbsp;load\u200b(Reader&nbsp;reader)<\/td><td>\u4ece\u8f93\u5165\u5b57\u7b26\u6d41\u8bfb\u53d6\u5c5e\u6027\u5217\u8868\uff08\u952e\u548c\u5143\u7d20\u5bf9\uff09<\/td><\/tr><tr><td>void&nbsp;store\u200b(OutputStream&nbsp;out,&nbsp;String&nbsp;comments)<\/td><td>\u5c06\u6b64\u5c5e\u6027\u5217\u8868\uff08\u952e\u548c\u5143\u7d20\u5bf9\uff09\u5199\u5165\u6b64&nbsp;Properties\u8868\u4e2d\uff0c\u4ee5\u9002\u5408\u4e8e\u4f7f\u7528&nbsp;load(InputStream)\u65b9\u6cd5\u7684\u683c\u5f0f\u5199\u5165\u8f93\u51fa\u5b57\u8282\u6d41<\/td><\/tr><tr><td>void&nbsp;store\u200b(Writer&nbsp;writer,&nbsp;String&nbsp;comments)<\/td><td>\u5c06\u6b64\u5c5e\u6027\u5217\u8868\uff08\u952e\u548c\u5143\u7d20\u5bf9\uff09\u5199\u5165\u6b64&nbsp;Properties\u8868\u4e2d\uff0c\u4ee5\u9002\u5408\u4f7f\u7528&nbsp;load(Reader)\u65b9\u6cd5\u7684\u683c\u5f0f\u5199\u5165\u8f93\u51fa\u5b57\u7b26\u6d41<\/td><\/tr><tr><td>public&nbsp;Object&nbsp;setProperty(String&nbsp;key,&nbsp;String&nbsp;value)&nbsp;<\/td><td>\u4fdd\u5b58\u952e\u503c\u5bf9\uff08put\uff09<\/td><\/tr><tr><td>public&nbsp;String&nbsp;getProperty(String&nbsp;key)&nbsp;<\/td><td>\u4f7f\u7528\u6b64\u5c5e\u6027\u5217\u8868\u4e2d\u6307\u5b9a\u7684\u952e\u641c\u7d22\u5c5e\u6027\u503c&nbsp;(get)<\/td><\/tr><tr><td>public&nbsp;Set&lt;String&gt;&nbsp;stringPropertyNames()<\/td><td>\u6240\u6709\u952e\u7684\u540d\u79f0\u7684\u96c6\u5408&nbsp;&nbsp;(keySet())<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.io.FileWriter;\r\nimport java.util.Map;\r\nimport java.util.Properties;\r\nimport java.util.Scanner;\r\n\r\n\/**\r\n    \u76ee\u6807\uff1aProperties\u7684\u6982\u8ff0\u548c\u4f7f\u7528(\u6846\u67b6\u5e95\u5c42\u4f7f\u7528\uff0c\u4e86\u89e3\u8fd9\u4e2a\u6280\u672f\u5373\u53ef)\uff08\u4fdd\u5b58\u6570\u636e\u5230\u5c5e\u6027\u6587\u4ef6\uff09\r\n\r\n    Properties: \u5c5e\u6027\u96c6\u5bf9\u8c61\u3002\r\n         \u5176\u5b9e\u5c31\u662f\u4e00\u4e2aMap\u96c6\u5408\u3002\u4e5f\u5c31\u662f\u4e00\u4e2a\u952e\u503c\u5bf9\u96c6\u5408\uff0c\u4f46\u662f\u6211\u4eec\u4e00\u822c\u4e0d\u4f1a\u5f53\u96c6\u5408\u4f7f\u7528\uff0c\r\n         \u56e0\u4e3a\u6709HashMap\u3002\r\n\r\n    Properties\u6838\u5fc3\u4f5c\u7528\uff1a\r\n         Properties\u4ee3\u8868\u7684\u662f\u4e00\u4e2a\u5c5e\u6027\u6587\u4ef6\uff0c\u53ef\u4ee5\u628a\u952e\u503c\u5bf9\u7684\u6570\u636e\u5b58\u5165\u5230\u4e00\u4e2a\u5c5e\u6027\u6587\u4ef6\u4e2d\u53bb\u3002\r\n         \u5c5e\u6027\u6587\u4ef6\uff1a\u540e\u7f00\u662f.properties\u7ed3\u5c3e\u7684\u6587\u4ef6,\u91cc\u9762\u7684\u5185\u5bb9\u90fd\u662f key=value\u3002\r\n\r\n    \u5927\u5bb6\u5728\u540e\u671f\u5b66\u7684\u5f88\u591a\u5927\u578b\u6846\u67b6\u6280\u672f\u4e2d\uff0c\u5c5e\u6027\u6587\u4ef6\u90fd\u662f\u5f88\u91cd\u8981\u7684\u7cfb\u7edf\u914d\u7f6e\u6587\u4ef6\u3002\r\n        users.properties\r\n                admin=123456\r\n                dlei=dlei\r\n\r\n     \u9700\u6c42\uff1a\u4f7f\u7528Properties\u5bf9\u8c61\u751f\u6210\u4e00\u4e2a\u5c5e\u6027\u6587\u4ef6\uff0c\u91cc\u9762\u5b58\u5165\u7528\u6237\u540d\u548c\u5bc6\u7801\u4fe1\u606f\u3002\r\n\r\n     Properties\u7684\u65b9\u6cd5\uff1a\r\n         -- public Object setProperty(String key, String value) \uff1a \u4fdd\u5b58\u4e00\u5bf9\u5c5e\u6027\u3002  (put)\r\n         -- public String getProperty(String key) : \u4f7f\u7528\u6b64\u5c5e\u6027\u5217\u8868\u4e2d\u6307\u5b9a\u7684\u952e\u641c\u7d22\u5c5e\u6027\u503c (get)\r\n         -- public Set&lt;String> stringPropertyNames() : \u6240\u6709\u952e\u7684\u540d\u79f0\u7684\u96c6\u5408  (keySet())\r\n         -- public void store(OutputStream out, String comments): \u4fdd\u5b58\u6570\u636e\u5230\u5c5e\u6027\u6587\u4ef6\u4e2d\u53bb\r\n         -- public void store(Writer fw, String comments): \u4fdd\u5b58\u6570\u636e\u5230\u5c5e\u6027\u6587\u4ef6\u4e2d\u53bb\r\n\r\n     \u5c0f\u7ed3\uff1a\r\n            Properties\u53ef\u4ee5\u4fdd\u5b58\u952e\u503c\u5bf9\u6570\u636e\u5230\u5c5e\u6027\u6587\u4ef6\r\n\r\n *\/\r\npublic class PropertiesDemo01 {\r\n    public static void main(String&#91;] args) throws Exception {\r\n        \/\/ \u9700\u6c42\uff1a\u4f7f\u7528Properties\u628a\u952e\u503c\u5bf9\u4fe1\u606f\u5b58\u5165\u5230\u5c5e\u6027\u6587\u4ef6\u4e2d\u53bb\u3002\r\n        Properties properties = new Properties();\r\n        properties.setProperty(\"admin\", \"123456\");\r\n        properties.setProperty(\"dlei\", \"003197\");\r\n        properties.setProperty(\"heima\", \"itcast\");\r\n        System.out.println(properties);\r\n\r\n        \/**\r\n           \u53c2\u6570\u4e00\uff1a\u4fdd\u5b58\u7ba1\u9053 \u5b57\u7b26\u8f93\u51fa\u6d41\u7ba1\u9053\r\n           \u53c2\u6570\u4e8c\uff1a\u4fdd\u5b58\u5fc3\u5f97\r\n         *\/\r\n        properties.store(new FileWriter(\"io-app2\/src\/users.properties\")\r\n                , \"this is users!! i am very happy! give me 100!\");\r\n\r\n    }\r\n}\n\nimport java.io.FileReader;\r\nimport java.util.Properties;\r\nimport java.util.Set;\r\n\r\n\/**\r\n    \u76ee\u6807\uff1aProperties\u8bfb\u53d6\u5c5e\u6027\u6587\u4ef6\u4e2d\u7684\u952e\u503c\u5bf9\u4fe1\u606f\u3002\uff08\u8bfb\u53d6\uff09\r\n    Properties\u7684\u65b9\u6cd5\uff1a\r\n        -- public Object setProperty(String key, String value) \uff1a \u4fdd\u5b58\u4e00\u5bf9\u5c5e\u6027\u3002\r\n        -- public String getProperty(String key) \uff1a\u4f7f\u7528\u6b64\u5c5e\u6027\u5217\u8868\u4e2d\u6307\u5b9a\u7684\u952e\u641c\u7d22\u5c5e\u6027\u503c\r\n        -- public Set&lt;String> stringPropertyNames() \uff1a\u6240\u6709\u952e\u7684\u540d\u79f0\u7684\u96c6\u5408\r\n        -- public void store(OutputStream out, String comments):\u4fdd\u5b58\u6570\u636e\u5230\u5c5e\u6027\u6587\u4ef6\u4e2d\u53bb\r\n        -- public synchronized void load(InputStream inStream):\u52a0\u8f7d\u5c5e\u6027\u6587\u4ef6\u7684\u6570\u636e\u5230\u5c5e\u6027\u96c6\u5bf9\u8c61\u4e2d\u53bb\r\n        -- public synchronized void load(Reader fr):\u52a0\u8f7d\u5c5e\u6027\u6587\u4ef6\u7684\u6570\u636e\u5230\u5c5e\u6027\u96c6\u5bf9\u8c61\u4e2d\u53bb\r\n    \u5c0f\u7ed3\uff1a\r\n        \u5c5e\u6027\u96c6\u5bf9\u8c61\u53ef\u4ee5\u52a0\u8f7d\u8bfb\u53d6\u5c5e\u6027\u6587\u4ef6\u4e2d\u7684\u6570\u636e!!\r\n *\/\r\npublic class PropertiesDemo02 {\r\n    public static void main(String&#91;] args) throws Exception {\r\n        \/\/ \u9700\u6c42\uff1aProperties\u8bfb\u53d6\u5c5e\u6027\u6587\u4ef6\u4e2d\u7684\u952e\u503c\u5bf9\u4fe1\u606f\u3002\uff08\u8bfb\u53d6\uff09\r\n        Properties properties = new Properties();\r\n        System.out.println(properties);\r\n\r\n        \/\/ \u52a0\u8f7d\u5c5e\u6027\u6587\u4ef6\u4e2d\u7684\u952e\u503c\u5bf9\u6570\u636e\u5230\u5c5e\u6027\u5bf9\u8c61properties\u4e2d\u53bb\r\n        properties.load(new FileReader(\"io-app2\/src\/users.properties\"));\r\n\r\n        System.out.println(properties);\r\n        String rs = properties.getProperty(\"dlei\");\r\n        System.out.println(rs);\r\n        String rs1 = properties.getProperty(\"admin\");\r\n        System.out.println(rs1);\r\n    }\r\n}\r\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">IO\u6846\u67b6<\/h3>\n\n\n\n<p>commons-io\u6982\u8ff0<br>commons-io\u662fapache\u5f00\u6e90\u57fa\u91d1\u7ec4\u7ec7\u63d0\u4f9b\u7684\u4e00\u7ec4\u6709\u5173IO\u64cd\u4f5c\u7684\u7c7b\u5e93\uff0c\u53ef\u4ee5\u63d0\u9ad8IO\u529f\u80fd\u5f00\u53d1\u7684\u6548\u7387\u3002<br>commons-io\u5de5\u5177\u5305\u63d0\u4f9b\u4e86\u5f88\u591a\u6709\u5173io\u64cd\u4f5c\u7684\u7c7b\u3002\u6709\u4e24\u4e2a\u4e3b\u8981\u7684\u7c7bFileUtils, IOUtils<\/p>\n\n\n\n<p>FileUtils\u4e3b\u8981\u6709\u5982\u4e0b\u65b9\u6cd5:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u65b9\u6cd5\u540d<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>String&nbsp;readFileToString(File&nbsp;file,&nbsp;String&nbsp;encoding)<\/td><td>\u8bfb\u53d6\u6587\u4ef6\u4e2d\u7684\u6570\u636e,&nbsp;\u8fd4\u56de\u5b57\u7b26\u4e32<\/td><\/tr><tr><td>void&nbsp;copyFile(File&nbsp;srcFile,&nbsp;File&nbsp;destFile)<\/td><td>\u590d\u5236\u6587\u4ef6\u3002<\/td><\/tr><tr><td>void&nbsp;copyDirectoryToDirectory(File&nbsp;srcDir,&nbsp;File&nbsp;destDir)<\/td><td>\u590d\u5236\u6587\u4ef6\u5939\u3002<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u5bfc\u5165commons-io-2.6.jar\u505a\u5f00\u53d1<\/p>\n\n\n\n<p>\u9700\u6c42<br>\u4f7f\u7528commons-io\u7b80\u5316io\u6d41\u8bfb\u5199<br>\u5206\u6790<br>\u5728\u9879\u76ee\u4e2d\u521b\u5efa\u4e00\u4e2a\u6587\u4ef6\u5939\uff1alib<br>\u5c06commons-io-2.6.jar\u6587\u4ef6\u590d\u5236\u5230lib\u6587\u4ef6\u5939<br>\u5728jar\u6587\u4ef6\u4e0a\u70b9\u53f3\u952e\uff0c\u9009\u62e9 Add as Library -> \u70b9\u51fbOK<br>\u5728\u7c7b\u4e2d\u5bfc\u5305\u4f7f\u7528<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import org.apache.commons.io.FileUtils;\r\nimport java.io.File;\r\n\r\n\/**\r\n    \u76ee\u6807:Commons-io\u5305\u7684\u4f7f\u7528\u4ecb\u7ecd\u3002\r\n\r\n    \u4ec0\u4e48\u662fCommons-io\u5305\uff1f\r\n            commons-io\u662fapache\u5f00\u6e90\u57fa\u91d1\u7ec4\u7ec7\u63d0\u4f9b\u7684\u4e00\u7ec4\u6709\u5173IO\u64cd\u4f5c\u7684\u7c7b\u5e93\uff0c\r\n            \u53ef\u4ee5\u633a\u63d0\u9ad8IO\u529f\u80fd\u5f00\u53d1\u7684\u6548\u7387\u3002commons-io\u5de5\u5177\u5305\u63d0\u4f9b\u4e86\u5f88\u591a\u6709\u5173io\u64cd\u4f5c\u7684\u7c7b\uff0c\r\n\r\n    \u89c1\u4e0b\u8868\uff1a\r\n         | \u5305                                  | \u529f\u80fd\u63cf\u8ff0                                     |\r\n         | ----------------------------------- | :------------------------------------------- |\r\n         | org.apache.commons.io               | \u6709\u5173Streams\u3001Readers\u3001Writers\u3001Files\u7684\u5de5\u5177\u7c7b |\r\n         | org.apache.commons.io.input         | \u8f93\u5165\u6d41\u76f8\u5173\u7684\u5b9e\u73b0\u7c7b\uff0c\u5305\u542bReader\u548cInputStream  |\r\n         | org.apache.commons.io.output        | \u8f93\u51fa\u6d41\u76f8\u5173\u7684\u5b9e\u73b0\u7c7b\uff0c\u5305\u542bWriter\u548cOutputStream |\r\n         | org.apache.commons.io.serialization | \u5e8f\u5217\u5316\u76f8\u5173\u7684\u7c7b\r\n\r\n    \u6b65\u9aa4\uff1a\r\n         1. \u4e0b\u8f7dcommons-io\u76f8\u5173jar\u5305\uff1bhttp:\/\/commons.apache.org\/proper\/commons-io\/\r\n         2. \u628acommons-io-2.6.jar\u5305\u590d\u5236\u5230\u6307\u5b9a\u7684Module\u7684lib\u76ee\u5f55\u4e2d\r\n         3. \u5c06commons-io-2.6.jar\u52a0\u5165\u5230classpath\u4e2d\r\n\r\n    \u5c0f\u7ed3\uff1a\r\n         IOUtils\u548cFileUtils\u53ef\u4ee5\u65b9\u4fbf\u7684\u590d\u5236\u6587\u4ef6\u548c\u6587\u4ef6\u5939\uff01\uff01\r\n *\/\r\npublic class CommonsIODemo01 {\r\n    public static void main(String&#91;] args) throws Exception {\r\n\r\n\/\/\/\/        \/\/ 1.\u5b8c\u6210\u6587\u4ef6\u590d\u5236\uff01\r\n\/\/        IOUtils.copy(new FileInputStream(\"D:\\\\resources\\\\hushui.jpeg\"),\r\n\/\/                new FileOutputStream(\"D:\\\\resources\\\\hushui2.jpeg\"));\r\n\r\n\r\n\/\/\/\/        \/\/ 2.\u5b8c\u6210\u6587\u4ef6\u590d\u5236\u5230\u67d0\u4e2a\u6587\u4ef6\u5939\u4e0b\uff01\r\n\/\/        FileUtils.copyFileToDirectory(new File(\"D:\\\\resources\\\\hushui.jpeg\"), new File(\"D:\/\"));\r\n\r\n\r\n          \/\/ 3.\u5b8c\u6210\u6587\u4ef6\u5939\u590d\u5236\u5230\u67d0\u4e2a\u6587\u4ef6\u5939\u4e0b\uff01\r\n\/\/          FileUtils.copyDirectoryToDirectory(new File(\"D:\\\\resources\") , new File(\"D:\\\\new\"));\r\n\/\/           FileUtils.deleteDirectory(new File(\"D:\\\\new\"));\r\n\r\n         \/\/ JDK1.7 \u81ea\u5df1\u4e5f\u505a\u4e86\u4e00\u4e9b\u4e00\u884c\u4ee3\u7801\u5b8c\u6210\u590d\u5236\u7684\u64cd\u4f5c:New IO\u7684\u6280\u672f\r\n         \/\/ Files.copy(Path.of(\"D:\\\\resources\\\\hushui.jpeg\"), Path.of(\"D:\\\\resources\\\\hushui3.jpeg\"));\r\n\r\n        FileUtils.deleteDirectory(new File(\"D:\\\\new\"));\r\n    }\r\n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u6d41\u76f8\u5173<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[23],"tags":[],"class_list":["post-641","post","type-post","status-publish","format-standard","hentry","category-java"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.gislxz.com\/index.php\/wp-json\/wp\/v2\/posts\/641","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.gislxz.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.gislxz.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.gislxz.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gislxz.com\/index.php\/wp-json\/wp\/v2\/comments?post=641"}],"version-history":[{"count":7,"href":"https:\/\/www.gislxz.com\/index.php\/wp-json\/wp\/v2\/posts\/641\/revisions"}],"predecessor-version":[{"id":662,"href":"https:\/\/www.gislxz.com\/index.php\/wp-json\/wp\/v2\/posts\/641\/revisions\/662"}],"wp:attachment":[{"href":"https:\/\/www.gislxz.com\/index.php\/wp-json\/wp\/v2\/media?parent=641"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.gislxz.com\/index.php\/wp-json\/wp\/v2\/categories?post=641"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.gislxz.com\/index.php\/wp-json\/wp\/v2\/tags?post=641"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}