{"id":203857,"date":"2025-05-22T12:20:47","date_gmt":"2025-05-22T04:20:47","guid":{"rendered":"https:\/\/server.hk\/cnblog\/203857\/"},"modified":"2025-05-22T12:20:47","modified_gmt":"2025-05-22T04:20:47","slug":"java-%e5%af%86%e5%b0%81%e7%b1%bb","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/203857\/","title":{"rendered":"Java \u5bc6\u5c01\u7c7b"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>Java \u5bc6\u5c01\u7c7b<\/h1>\n<p><span style=\"cursor: pointer\"><i><\/i>\u6536\u85cf<\/span>    <\/p>\n<p>\u54c8\u55bd\uff01\u4eca\u5929\u5fc3\u8840\u6765\u6f6e\u7ed9\u5927\u5bb6\u5e26\u6765\u4e86<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300aJava \u5bc6\u5c01\u7c7b\u300b<\/span>\uff0c\u60f3\u5fc5\u5927\u5bb6\u5e94\u8be5\u5bf9<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u6587\u7ae0<\/span>\u90fd\u4e0d\u964c\u751f\u5427\uff0c\u90a3\u4e48\u9605\u8bfb\u672c\u6587\u5c31\u90fd\u4e0d\u4f1a\u5f88\u56f0\u96be\uff0c\u4ee5\u4e0b\u5185\u5bb9\u4e3b\u8981\u6d89\u53ca\u5230<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\uff0c\u82e5\u662f\u4f60\u6b63\u5728\u5b66\u4e60<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u6587\u7ae0<\/span>\uff0c\u5343\u4e07\u522b\u9519\u8fc7\u8fd9\u7bc7\u6587\u7ae0~\u5e0c\u671b\u80fd\u5e2e\u52a9\u5230\u4f60\uff01<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241128\/1732784820674832b4b136d.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>\u5bc6\u5c01\u7c7b<\/strong> \u662f\u4e4b\u524d\u5728 jdk 15 \u4e2d\u5f15\u5165\u5e76\u5728 jdk 17 \u4e2d\u6b63\u5f0f\u5f15\u5165\u7684\u529f\u80fd\u3002<strong>\u5bc6\u5c01\u7c7b<\/strong> \u662f\u4e0d\u80fd\u7531\u672a\u660e\u786e\u5141\u8bb8\u7684\u7c7b\u6269\u5c55\u7684\u7c7b\uff08\u5728\u7c7b\u58f0\u660e\u4e2d\uff09\uff0c\u56e0\u6b64\u5b50\u7c7b\u7684\u6570\u91cf\u662f\u6709\u9650\u7684\u5e76\u4e14\u63d0\u524d\u77e5\u9053\u3002<\/p>\n<p>\u5b83\u4eec\u7684\u76ee\u7684\u662f\u5141\u8bb8\u66f4\u7cbe\u786e\u5730\u63a7\u5236\u7ee7\u627f\u5c42\u6b21\u7ed3\u6784\uff0c\u5e76\u4fc3\u8fdb\u6240\u6709\u53ef\u80fd\u7684\u5b50\u7c7b\u5df2\u77e5\u7684\u57df\u7684\u5efa\u6a21\uff0c\u5e76\u63d0\u9ad8\u4ee3\u7801\u7684\u5b89\u5168\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002<\/p>\n<p><strong>\u5bc6\u5c01\u7c7b<\/strong>\u548c\u6700\u7ec8\u7c7b\u578b\u7684\u7c7b\u4e4b\u95f4\u7684\u533a\u522b\u5728\u4e8e\u540e\u8005\u4e0d\u80fd\u88ab\u4efb\u4f55\u7c7b\u6269\u5c55\uff0c\u800c<strong>\u5bc6\u5c01\u7c7b<\/strong>\u53ef\u4ee5\u6269\u5c55\u6709\u9650\u6570\u91cf\u7684\u7c7b\u8bfe\u7a0b\u3002<\/p>\n<h2> \u5bc6\u5c01\u7c7b\u58f0\u660e <\/h2>\n<p>\u5047\u8bbe\u6211\u4eec\u6709\u4e24\u4e2a\u7c7b\uff0c\u4e00\u4e2a shape \u7c7b\u548c\u4e00\u4e2a circle \u7c7b\uff0c\u5b83\u4eec\u90fd\u662f\u666e\u901a\u7c7b\uff0c\u6240\u4ee5 shape \u53ef\u4ee5\u88ab\u4efb\u4f55\u7c7b\u6269\u5c55\u3002<\/p>\n<pre>public class shape {\n    \/\/ ...\n}\n\npublic class circle extends shape {\n    \/\/ ...\n}\n<\/pre>\n<p>\u5982\u679c\u6211\u4eec\u5728shape\u7c7b\u4e2d\u4f7f\u7528final\u5173\u952e\u5b57\uff0c\u90a3\u4e48\u5b83\u5c31\u4e0d\u80fd\u88ab\u4efb\u4f55\u7c7b\u6269\u5c55\u3002<\/p>\n<pre>public final class shape {\n    \/\/ ...\n}\n\npublic class circle extends shape { \/\/ error\n    \/\/ ...\n}\n<\/pre>\n<p>\u73b0\u5728\uff0c\u5982\u679c\u6211\u4eec\u5e0c\u671b shape \u7c7b\u4ec5\u7531\u67d0\u4e9b\u7c7b\uff08\u4f8b\u5982 circle \u548c square\uff09\u6269\u5c55\uff0c\u90a3\u4e48\u6211\u4eec\u53ef\u4ee5\u5c06\u5176\u58f0\u660e\u4e3a <strong>\u5bc6\u5c01\u7c7b<\/strong>\u3002<\/p>\n<pre>public sealed class shape permits circle, square {\n    \/\/ ...\n}\n<\/pre>\n<p>\u5206\u6790\u524d\u9762\u7684\u58f0\u660e\uff0c\u6211\u4eec\u53d1\u73b0\u9700\u8981\u5728\u5355\u8bcdclass\u4e4b\u524d\u653e\u7f6esealed\uff0c\u4ee5\u8868\u660e\u5b83\u662f\u4e00\u4e2a<strong>\u5bc6\u5c01\u7c7b<\/strong>\u3002\u7136\u540e\uff0c\u4f7f\u7528\u201cpermits\u201d\u4e00\u8bcd\uff0c\u540e\u9762\u8ddf\u7740\u53ef\u4ee5\u6269\u5c55\u5f53\u524d\u7c7b\u7684\u7c7b\u5217\u8868\uff0c\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u53ea\u6709 circle \u548c square \u7c7b\u53ef\u4ee5\u6269\u5c55 shape \u7c7b\u3002<\/p>\n<p>\u5982\u679c\u60a8\u4f7f\u7528\u62bd\u8c61\u7c7b\u578b\u7684\u7c7b\uff0c\u5373\u65e0\u6cd5\u5b9e\u4f8b\u5316\u4f46\u53ef\u4ee5\u7531\u5176\u4ed6\u7c7b\u6269\u5c55\u7684\u7c7b\uff0c\u4e5f\u4f1a\u53d1\u751f\u540c\u6837\u7684\u60c5\u51b5\u3002<\/p>\n<pre>public sealed abstract class shape permits circle, square {\n    \/\/ ...\n}\n<\/pre>\n<p>\u8fd9\u4e2a\u6982\u5ff5\u4e5f\u53ef\u4ee5\u5e94\u7528\u4e8e\u63a5\u53e3\u3002<\/p>\n<pre>public sealed interface shape permits circle, square {\n    \/\/ ...\n}\n<\/pre>\n<blockquote>\n<p><strong>\u6ce8\u610f<\/strong>\uff1a\u5141\u8bb8\u7684\u5b50\u7c7b\u5fc5\u987b\u4e0e<strong>sealed<\/strong>\u7c7b\u4f4d\u4e8e\u540c\u4e00\u6a21\u5757\u6216\u5305\u4e2d\uff0c\u5426\u5219\u5c06\u663e\u793a\u9519\u8bef\u6d88\u606f\u3002<\/p>\n<\/blockquote>\n<h2> \u5141\u8bb8\u7684\u8bfe\u7a0b <\/h2>\n<p>\u4e00\u65e6\u5c06\u7c7b\u58f0\u660e\u4e3a seal \u5e76\u6307\u5b9a\u4e86\u5141\u8bb8\u7684\u7c7b\uff0c\u5f53\u4f7f\u7528\u5141\u8bb8\u7684\u7c7b\u6269\u5c55 shape \u7c7b\uff08\u901a\u8fc7\u653e\u7f6e extends shape\uff09\u65f6\uff0cide \u5c06\u663e\u793a\u7c7b\u4f3c\u4e8e\u6b64\u7684\u9519\u8bef\u6d88\u606f <em>modifier &#8216;sealed&#8217; \uff0c\u2018\u672a\u5bc6\u5c01\u2019\u6216\u2018\u6700\u7ec8\u2019\u9884\u8ba1<\/em>\uff0c\u8fd9\u662f\u4ec0\u4e48\u610f\u601d\uff1f.<\/p>\n<p>\u5fc5\u987b\u8003\u8651\u5230\u6bcf\u4e2a\u5141\u8bb8\u7684\u7c7b\uff08\u5b50\u7c7b\uff09\u90fd\u5fc5\u987b\u4f7f\u7528\u4ee5\u4e0b\u5173\u952e\u5b57\u4e4b\u4e00\u8fdb\u884c\u58f0\u660e\uff1a<\/p>\n<ul>\n<li> final\uff1a\u8868\u793a\u8be5\u7c7b\u4e0d\u80fd\u6269\u5c55\u3002<\/li>\n<li> sealed\uff1a\u8868\u793a\u8be5\u7c7b\u662f<strong>\u5bc6\u5c01\u7c7b<\/strong>\u5e76\u4e14\u5b83\u5141\u8bb8\u5b50\u7c7b\u3002<\/li>\n<li> \u975e\u5bc6\u5c01\uff1a\u8868\u793a\u8be5\u7c7b\u4e0d\u662f<strong>\u5bc6\u5c01\u7c7b<\/strong>\u5e76\u4e14\u53ef\u4ee5\u7531\u4efb\u4f55\u7c7b\u6269\u5c55\u3002<\/li>\n<\/ul>\n<p>\u4e3a\u4e86\u5c06\u4e0a\u8ff0\u5185\u5bb9\u4ed8\u8bf8\u5b9e\u8df5\uff0c\u8ba9\u6211\u4eec\u4f7f\u7528 shape \u7c7b\u4ee5\u53ca circle\u3001square \u548c triangle \u7c7b\u6765\u770b\u770b\u5982\u4f55\u6839\u636e\u4e0a\u9762\u63d0\u5230\u7684\u5185\u5bb9\u6765\u58f0\u660e\u5141\u8bb8\u7684\u7c7b\u3002<\/p>\n<pre>public sealed class shape permits circle, square, triangle {\n    \/\/ ...\n}\n<\/pre>\n<h3> \u5706\u73ed-\u51b3\u8d5b <\/h3>\n<p>\u5982\u679c\u6211\u4eec\u5e0c\u671b circle \u7c7b\u662f\u6700\u7ec8\u7c7b\u578b\u5e76\u4e14\u56e0\u6b64\u4e0d\u80fd\u6269\u5c55\uff0c\u90a3\u4e48\u5b83\u5fc5\u987b\u58f0\u660e\u5982\u4e0b\uff1a<\/p>\n<pre>public final class circle extends shape {\n    \/\/ ...\n}\n<\/pre>\n<p>\u8fd9\u53ef\u4ee5\u9632\u6b62 circle \u7c7b\u88ab\u4efb\u4f55\u5176\u4ed6\u7c7b\u6269\u5c55\u3002<\/p>\n<h3> \u65b9\u5f62\u7c7b-\u5bc6\u5c01 <\/h3>\n<p>\u5982\u679c\u6211\u4eec\u5e0c\u671b square \u7c7b\u662f\u5bc6\u5c01\u7c7b\u578b\u5e76\u4e14\u5141\u8bb8\u5b50\u7c7b\u53ef\u4ee5\u6269\u5c55\u5b83\uff0c\u90a3\u4e48\u5b83\u5fc5\u987b\u58f0\u660e\u5982\u4e0b\uff1a<\/p>\n<pre>public sealed class square extends shape permits squarechild1, squarechild2 {\n    \/\/ ...\n}\n<\/pre>\n<p>\u5bf9\u4e8e\u6b64\u793a\u4f8b\uff0c\u6bcf\u4e2a\u5141\u8bb8\u7684\u7c7b\uff08squarechild1 \u548c squarechild2\uff09\u90fd\u58f0\u660e\u4e3a final \u7c7b\u578b\uff0c\u4ee5\u4fbf\u5b83\u4eec\u4e0d\u80fd\u7531\u4efb\u4f55\u5176\u4ed6\u7c7b\u6269\u5c55\u3002<\/p>\n<pre>public final class squarechild1 extends square {\n    \/\/ ...\n}\n\npublic final class squarechild2 extends square {\n    \/\/ ...\n}\n<\/pre>\n<p>\u5982\u679c\u60a8\u5e0c\u671b\u8fd9\u4e9b\u7c7b\u80fd\u591f\u6269\u5c55\u66f4\u591a\u7684\u7c7b\uff0c\u90a3\u4e48\u5e94\u8be5\u5c06\u5b83\u4eec\u58f0\u660e\u4e3a\u5bc6\u5c01\u7684\uff0c\u6216\u8005\u5b83\u4eec\u53ef\u4ee5\u7531\u4efb\u4f55\u975e\u5bc6\u5c01\u7684\u7c7b\u6269\u5c55\u3002<\/p>\n<h3> \u4e09\u89d2\u7c7b-\u975e\u5bc6\u5c01 <\/h3>\n<p>\u5bf9\u4e8e triangle \u7c7b\uff0c\u5c06\u5176\u58f0\u660e\u4e3a\u975e\u5bc6\u5c01\u7c7b\u5141\u8bb8\u4efb\u4f55\u5176\u4ed6\u7c7b\u6269\u5c55\u8be5\u7c7b\uff0c\u800c\u65e0\u9700\u6307\u5b9a\u5141\u8bb8\u7684\u7c7b\u3002<\/p>\n<pre>public non-sealed class triangle extends shape {\n    \/\/ ...\n}\n<\/pre>\n<p>\u4f8b\u5982\uff0c\u5982\u679c\u60a8\u521b\u5efa\u6269\u5c55 triangle \u7684 trianglechild \u7c7b\uff0c\u5219\u4e0d\u4f1a\u663e\u793a\u9519\u8bef\u6d88\u606f\u3002<\/p>\n<pre>public class trianglechild extends triangle {\n    \/\/ ...\n}\n<\/pre>\n<p>\u6b64\u65f6\uff0c\u91cd\u8981\u7684\u662f\u8981\u8003\u8651\u5230\uff0c\u5982\u679c\u60a8\u5c06\u4e00\u4e2a\u7c7b\u58f0\u660e\u4e3a\u975e\u5bc6\u5c01\u7c7b\uff0c\u90a3\u4e48\u60a8\u4f1a\u4ee5\u67d0\u79cd\u65b9\u5f0f <em>\u201c\u7834\u574f\u201d<\/em> <strong>\u5bc6\u5c01\u7c7b<\/strong> \u7684\u76ee\u7684\uff0c\u56e0\u4e3a\u5b83\u5141\u8bb8\u6b64\u7c7b\u7531\u4efb\u4f55\u5176\u4ed6\u7c7b\u6269\u5c55\uff0c\u5e76\u4e14\u5141\u8bb8\u7684\u5b50\u7c7b\u6570\u91cf\u4e0d\u53d7\u9650\u5236\u3002<\/p>\n<h2> \u8bb0\u5f55\u53ef\u4ee5\u662f\u5bc6\u5c01\u7c7b\u5417\uff1f <\/h2>\n<p>\u5c31\u5176\u672c\u8eab\u800c\u8a00\uff0c<strong>\u8bb0\u5f55<\/strong>\u4e0d\u80fd\u662f\u5bc6\u5c01\u7c7b\u578b\uff0c\u56e0\u4e3a\u5b83\u5df2\u7ecf\u662f\u6700\u7ec8\u7c7b\u578b\u5e76\u4e14\u4e0d\u80fd\u7531\u4efb\u4f55\u5176\u4ed6\u7c7b\u6269\u5c55\u3002\u4f46\u662f\u60a8\u53ef\u4ee5\u505a\u7684\u662f\u5728\u5bc6\u5c01\u7c7b\u578b\u7684 <strong>interface<\/strong> \u4e2d\u58f0\u660e\u5141\u8bb8\u7684 <strong>record<\/strong> \uff08\u8003\u8651\u5230\u8bb0\u5f55\u4e0d\u80fd\u6269\u5c55\u7c7b\uff0c\u53ea\u80fd\u5b9e\u73b0\u63a5\u53e3\uff09\u3002\u4f8b\u5982\uff0c\u5982\u679c\u60a8\u6709\u4e00\u4e2a\u540d\u4e3a rectangle \u7684\u8bb0\u5f55\u548c\u4e00\u4e2a seal \u7c7b\u578b\u7684 shape \u63a5\u53e3\uff0c\u60a8\u53ef\u4ee5\u5728 shape \u63a5\u53e3\u4e2d\u58f0\u660e rectangle \uff0c\u8fd9\u6837 rectangle \u5c31\u80fd\u591f\u5b9e\u73b0 shape \u63a5\u53e3\u4ee5\u53ca\u8be5\u63a5\u53e3\u5305\u542b\u7684\u6240\u6709\u65b9\u6cd5\u3002 <\/p>\n<pre>public sealed interface shape permits rectangle {\n    \/\/ ...\n}\n\npublic record rectangle() implements shape {\n    \/\/ ...\n}\n<\/pre>\n<h2> \u90a3\u4e48\u5185\u90e8\u7c7b\u5462\uff1f <\/h2>\n<p>\u5982\u679c\u58f0\u660e\u4e3a\u5bc6\u5c01\u7684\u7c7b\u5177\u6709\u5185\u90e8\u7c7b\uff08\u5d4c\u5957\u6216\u5185\u90e8\u7c7b\uff09\uff0c\u5219\u5047\u5b9a\u8fd9\u4e9b\u7c7b\u5c5e\u4e8e\u4e3b\u7c7b\uff0c\u56e0\u6b64\u65e0\u9700\u5c06\u5b83\u4eec\u58f0\u660e\u4e3a\u5141\u8bb8\u7684\u3002\u4f8b\u5982\uff0c\u5982\u679c\u60a8\u5c06 animal \u7c7b\u58f0\u660e\u4e3a seal\uff0c\u540c\u65f6\u5c06 dog \u548c cat \u4f5c\u4e3a\u5185\u90e8\u7c7b\uff0c\u5219\u8fd9\u4e9b\u7c7b\u4e0d\u9700\u8981\u58f0\u660e\u4e3a allowed\uff0c\u4f46\u5b83\u4eec\u5fc5\u987b\u6269\u5c55\u4e3b\u7c7b\u5e76\u4e3a\u6700\u7ec8\u7c7b\u578b\uff0c\u5bc6\u5c01\u6216\u975e\u5bc6\u5c01\u3002<\/p>\n<pre>public sealed class Animal {\n\n    public final class Dog extends Animal { }\n\n    public final class Cat extends Animal { }\n\n}\n<\/pre>\n<h2> \u7ed3\u8bba <\/h2>\n<p><strong>\u5bc6\u5c01\u7c7b<\/strong>\u662f\u4e00\u79cd\u5c06\u7c7b\u5c42\u6b21\u7ed3\u6784\u9650\u5236\u4e3a\u6709\u9650\u6570\u91cf\u7684\u5141\u8bb8\u5b50\u7c7b\u7684\u65b9\u6cd5\uff0c\u5c3d\u7ba1\u6211\u4eec\u5df2\u7ecf\u770b\u5230\uff0c\u5982\u679c\u4e00\u4e2a\u7c7b\u88ab\u58f0\u660e\u4e3a\u975e\u5bc6\u5c01\uff0c\u90a3\u4e48\u76ee\u7684\u5c31\u6709\u70b9\u4e22\u5931\u4e86\uff0c\u6216\u8005\u901a\u8fc7\u58f0\u660e\u4e00\u4e2a\u4f5c\u4e3a\u5bc6\u5c01\u5b50\u7c7b\uff0c\u60a8\u53ef\u4ee5\u8fdb\u4e00\u6b65\u6269\u5c55\u6b64\u5c42\u6b21\u7ed3\u6784\u3002<\/p>\n<p>\u9700\u8981\u8003\u8651\u7684\u662f\uff0c\u5728\u58f0\u660e\u4e00\u4e2a\u7c7b\u4e3asealed\u65f6\uff0c\u8fd9\u53ea\u6307\u8c01\u53ef\u4ee5\u6269\u5c55\u5b83\uff0c\u800c\u4e0d\u4f1a\u9650\u5236\u4e3b\u7c7b\u5b9e\u4f8b\u7684\u521b\u5efa\uff0c\u4e5f\u4e0d\u4f1a\u4fee\u6539\u8be5\u7c7b\u7684\u8bed\u4e49\uff0c\u5373\u5b83\u4e0d\u4f1a\u4fee\u6539\u7c7b\u7684\u5185\u90e8\u884c\u4e3a\u3002<\/p>\n<p>\u7ec8\u4e8e\u4ecb\u7ecd\u5b8c\u5566\uff01\u5c0f\u4f19\u4f34\u4eec\uff0c\u8fd9\u7bc7\u5173\u4e8e\u300aJava 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