{"id":892,"date":"2023-03-08T11:44:44","date_gmt":"2024-01-31T15:14:51","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/java-15%e7%9a%84%e6%96%b0%e7%89%b9%e6%80%a7\/"},"modified":"2025-08-03T15:53:00","modified_gmt":"2025-08-03T07:53:00","slug":"java-15%e7%9a%84%e6%96%b0%e7%89%b9%e6%80%a7","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java-15%e7%9a%84%e6%96%b0%e7%89%b9%e6%80%a7\/","title":{"rendered":"Java 15\u65b0\u7279\u6027\u5168\u9762\u89e3\u6790\uff1a2020\u5e74\u5fc5\u77e5\u7684Java\u8bed\u8a00\u66f4\u65b0\u4e0e\u6539\u8fdb"},"content":{"rendered":"<p>\u6309\u7167\u6bcf\u516d\u4e2a\u6708\u53d1\u5e03\u4e00\u6b21\u7684\u60ef\u4f8b\uff0c\u57282020\u5e743\u670817\u65e5\u53d1\u5e03\u4e86Java 14\u4e4b\u540e\uff0c\u6211\u4eec\u73b0\u5728\u5373\u5c06\u8fce\u67652020\u5e749\u670815\u65e5\u53d1\u5e03\u7684Java 15\uff0c\u8fd9\u662f\u63a5\u4e0b\u6765\u7684\u975eLTS\u7248\u672c\u3002<\/p>\n<h2>Java 15 \u65b0\u7279\u6027<\/h2>\n<p>\u4ee5\u4e0b\u662fJava 15\u4e2d\u7684\u4e00\u4e9b\u7279\u6027\u7b80\u8981\u4ecb\u7ecd\uff1a<\/p>\n<ul class=\"post-ul\">\n<li>\u5bc6\u5c01\u7c7b\uff08\u9884\u89c8\u7248\uff09\u2013 JEP 360<\/li>\n<li>instanceof\u7684\u6a21\u5f0f\u5339\u914d\uff08\u7b2c\u4e8c\u6b21\u9884\u89c8\uff09\u2013 JEP 375<\/li>\n<li>\u8bb0\u5f55\u7c7b\uff08\u7b2c\u4e8c\u6b21\u9884\u89c8\uff09\u2013 JEP 359<\/li>\n<li>\u6587\u672c\u5757\uff08\u6807\u51c6\u7248\uff09\u2013 JEP 378<\/li>\n<li>\u9690\u85cf\u7c7b \u2013 JEP 371<\/li>\n<li>\u79fb\u9664Nashorn JavaScript\u5f15\u64ce \u2013 JEP 372<\/li>\n<li>\u91cd\u65b0\u5b9e\u73b0\u4f20\u7edfDatagramSocket API \u2013 JEP 373<\/li>\n<li>\u7981\u7528\u548c\u5e9f\u5f03\u504f\u5411\u9501 \u2013 JEP 374<\/li>\n<li>Shenandoah\uff1a\u4f4e\u6682\u505c\u65f6\u95f4\u5783\u573e\u6536\u96c6\u5668 \u2013 JEP 379<\/li>\n<li>\u79fb\u9664Solaris\u548cSPARC\u7aef\u53e3 \u2013 JEP 381<\/li>\n<li>\u5916\u90e8\u5185\u5b58\u8bbf\u95eeAPI\uff08\u7b2c\u4e8c\u6b21\u5b75\u5316\uff09\u2013 JEP 383<\/li>\n<li>\u5e9f\u5f03RMI\u6fc0\u6d3b\u673a\u5236\u4ee5\u4fbf\u79fb\u9664 \u2013 JEP 385<\/li>\n<\/ul>\n<h2>\u5728Mac OS\u4e0a\u5b89\u88c5Java 15<\/h2>\n<ul class=\"post-ul\">\n<li>\u8981\u5f00\u59cb\u4f7f\u7528Java 15\uff0c\u8bf7\u4ece\u6b64\u5904\u4e0b\u8f7dJDK\u3002<\/li>\n<li>\u5c06tar\u6587\u4ef6\u590d\u5236\u5e76\u89e3\u538b\u5230\/Library\/Java\/JavaVirtualMachines\u76ee\u5f55\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/li>\n<\/ul>\n<pre class=\"post-pre\"><code>$ <span class=\"token builtin class-name\">cd<\/span> \/Library\/Java\/JavaVirtualMachines\r\n\r\n$ <span class=\"token function\">sudo<\/span> <span class=\"token function\">cp<\/span> ~\/Downloads\/openjdk-15_osx-x64_bin.tar.gz \/Library\/Java\/JavaVirtualMachines\r\n\r\n$ <span class=\"token function\">sudo<\/span> <span class=\"token function\">tar<\/span> xzf openjdk-15_osx-x64_bin.tar.gz\r\n\r\n$ <span class=\"token function\">sudo<\/span> <span class=\"token function\">rm<\/span> openjdk-15_osx-x64_bin.tar.gz\r\n<\/code><\/pre>\n<p>\u5b8c\u6210\u540e\uff0c\u4f7f\u7528\u4efb\u4f55\u6587\u672c\u7f16\u8f91\u5668\u6253\u5f00bash_profile\u6587\u4ef6\u3002\u6211\u6b63\u5728\u4f7f\u7528vim ~\/.bash_profile\u547d\u4ee4\u3002\u5c06Java 15\u7684\u8def\u5f84\u8bbe\u7f6e\u4e3aJAVA_HOME\uff0c\u4fdd\u5b58\u66f4\u6539\u5e76\u6267\u884csource ~\/.bash_profile\u547d\u4ee4\u4ee5\u4f7f\u66f4\u6539\u751f\u6548\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token builtin class-name\">export<\/span> <span class=\"token assign-left variable\">JAVA_HOME<\/span><span class=\"token operator\">=<\/span>\/Library\/Java\/JavaVirtualMachines\/jdk-15.jdk\/Contents\/Home\r\n<\/code><\/pre>\n<p>\u6700\u540e\uff0c\u4f60\u5c31\u53ef\u4ee5\u4f7f\u7528Java 15\u7f16\u8bd1\u548c\u8fd0\u884c\u7a0b\u5e8f\u4e86\u3002\u6211\u4eec\u5c06\u4f7f\u7528JShell\uff0c\u4e00\u4e2a\u4ea4\u4e92\u5f0fREPL\u547d\u4ee4\u884c\u5de5\u5177\uff0c\u5feb\u901f\u6d4b\u8bd5\u65b0\u7684Java 15\u7279\u6027\u3002<\/p>\n<p>\u8bf7\u6ce8\u610f\uff0cJava 15\u4e2d\u53d1\u5e03\u7684\u8bb8\u591a\u529f\u80fd\u5904\u4e8e\u9884\u89c8\u72b6\u6001\u3002\u8fd9\u610f\u5473\u7740\u867d\u7136\u5b83\u4eec\u76ee\u524d\u5b8c\u5168\u53ef\u7528\uff0c\u4f46\u4ee5\u540e\u53ef\u80fd\u4f1a\u8fdb\u884c\u4fee\u6539\u3002\u4e00\u4e9b\u529f\u80fd\u53ef\u80fd\u4f1a\u6210\u4e3a\u6807\u51c6\uff0c\u6216\u5728\u4e0b\u4e00\u4e2a\u53d1\u5e03\u5468\u671f\u4e2d\u88ab\u79fb\u9664\u3002\u4e3a\u4e86\u6d4b\u8bd5\u9884\u89c8\u529f\u80fd\uff0c\u60a8\u9700\u8981\u5728\u8fd0\u884cJShell\u6216Java\u7a0b\u5e8f\u65f6\u663e\u5f0f\u8bbe\u7f6e&#8211;enable-preview\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre class=\"post-pre\"><code>jshell --enable-preview\r\n\r\njavac <span class=\"token parameter variable\">--release<\/span> <span class=\"token number\">15<\/span> --enable-preview Author.java\r\n<\/code><\/pre>\n<p>\u5728\u63a5\u4e0b\u6765\u7684\u51e0\u4e2a\u90e8\u5206\u4e2d\uff0c\u8ba9\u6211\u4eec\u8ba8\u8bba\u4e00\u4e0bJava 15\u4e2d\u7684\u91cd\u5927\u8bed\u8a00\u53d8\u5316\u3002<\/p>\n<h2>1. \u5bc6\u5c01\u7c7b\uff08\u9884\u89c8\u7248\uff09<\/h2>\n<h2>Java 15\u7684\u65b0\u7279\u6027\uff1a\u5bc6\u5c01\u7c7b\u4e0e\u8bb0\u5f55\uff08\u7b2c2\u90e8\u5206\uff09<\/h2>\n<p>\u81ea\u4ece Kotlin \u63a8\u51fa\u4ee5\u6765\uff0c\u5bc6\u5c01\u7c7b\u4e00\u76f4\u5b58\u5728\uff0c\u5e76\u4e14 Java 15 \u6700\u7ec8\u5f15\u5165\u4e86\u8fd9\u4e00\u7279\u6027\uff0c\u4ee5\u63d0\u4f9b\u66f4\u597d\u5730\u5bf9\u7ee7\u627f\u8fdb\u884c\u63a7\u5236\u7684\u529f\u80fd\u3002<\/p>\n<p>\u6b63\u5982\u5176\u540d\uff0c\u5bc6\u5c01\u7c7b\u53ef\u4ee5\u8ba9\u60a8\u9650\u5236\u6216\u5141\u8bb8\u4ec5\u7279\u5b9a\u7c7b\u578b\u7684\u7c7b\u7ee7\u627f\u5173\u7cfb\u3002<\/p>\n<p>\u8fd9\u5bf9\u4e8e\u6a21\u5f0f\u5339\u914d\u975e\u5e38\u6709\u7528\uff0c\u56e0\u4e3a\u60a8\u53ef\u4ee5\u5728\u4e00\u7ec4\u7279\u5b9a\u7684\u7c7b\u522b\u4e4b\u95f4\u8fdb\u884c\u5207\u6362\u3002<\/p>\n<p>\u4ee5\u4e0b\u8bed\u6cd5\u5728Java 15\u4e2d\u5b9a\u4e49\u4e86\u4e00\u4e2a\u5bc6\u5c01\u7c7b\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">sealed<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Vehicle<\/span> <span class=\"token keyword\">permits<\/span> <span class=\"token class-name\">Car<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Bike<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Truck<\/span> <span class=\"token punctuation\">{<\/span>\r\n<span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<p>\u6240\u4ee5\uff0c\u4e0a\u8ff0\u4ee3\u7801\u610f\u5473\u7740\u53ea\u6709\u5728\u5173\u952e\u5b57&#8221;permits&#8221;\u4e4b\u540e\u5b9a\u4e49\u7684\u7c7b\u624d\u53ef\u4ee5\u6269\u5c55Vehicle\u5bc6\u5c01\u7c7b\u3002<\/p>\n<p>\u5982\u679c\u4f60\u5df2\u7ecf\u5728\u540c\u4e00\u4e2a\u6587\u4ef6\u4e2d\u5b9a\u4e49\u4e86Car\u3001Bike\u548cTruck\u8fd9\u4e9b\u7c7b\uff0c\u4f60\u53ef\u4ee5\u7701\u7565\u5173\u952e\u5b57permits\uff0c\u7f16\u8bd1\u5668\u4f1a\u9690\u5f0f\u5730\u5904\u7406\u5b83\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">sealed<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Vehicle<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">}<\/span>\r\n\r\n<span class=\"token keyword\">final<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Car<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">Vehicle<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">}<\/span>\r\n<span class=\"token keyword\">final<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Bike<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">Vehicle<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">}<\/span>\r\n<span class=\"token keyword\">final<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Truck<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">Vehicle<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<p>\u6b63\u5982\u4f60\u5728\u4e0a\u9762\u6240\u770b\u5230\u7684\uff0c\u6211\u4eec\u5df2\u7ecf\u5b9a\u4e49\u4e86\u6bcf\u4e2a\u7c7b\u7684final\u4fee\u9970\u7b26\u3002\u73b0\u5728\uff0c\u8fd9\u662f\u4e00\u4e2a\u5173\u4e8e\u5bc6\u5c01\u7c7b\u7684\u91cd\u8981\u89c4\u5219\uff0c\u4f60\u9700\u8981\u8bb0\u4f4f\uff1a\u6bcf\u4e2a\u5141\u8bb8\u7684\u7c7b\u90fd\u5fc5\u987b\u8bbe\u7f6e\u4e00\u4e2a\u660e\u786e\u7684\u4fee\u9970\u7b26\u3002\u5b83\u53ef\u4ee5\u662ffinal\u3001sealed\u6216\u8005non-sealed\u4e4b\u4e00\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u6bcf\u4e2a\u4fee\u9970\u8bcd\u5bf9\u7ee7\u627f\u4ea7\u751f\u7684\u5f71\u54cd\uff1a<\/p>\n<ul class=\"post-ul\">\n<li>\u58f0\u660e\u4e3afinal\u7684\u5141\u8bb8\u5b50\u7c7b\u4e0d\u80fd\u88ab\u8fdb\u4e00\u6b65\u6269\u5c55\u3002<\/li>\n<li>\u58f0\u660e\u4e3asealed\u7684\u5141\u8bb8\u5b50\u7c7b\u53ef\u4ee5\u88ab\u8fdb\u4e00\u6b65\u6269\u5c55\uff0c\u4f46\u53ea\u80fd\u7531\u8be5\u5b50\u7c7b\u5141\u8bb8\u7684\u7c7b\u8fdb\u884c\u6269\u5c55\u3002<\/li>\n<li>\u58f0\u660e\u4e3anon-sealed\u7684\u5141\u8bb8\u5b50\u7c7b\u53ef\u4ee5\u88ab\u4efb\u4f55\u7c7b\u8fdb\u4e00\u6b65\u6269\u5c55\u3002\u8d85\u7c7b\u4e0d\u80fd\u5728\u6b64\u7c7b\u5c42\u6b21\u7ed3\u6784\u4e2d\u8fdb\u4e00\u6b65\u9650\u5236\u5b50\u7c7b\u3002<\/li>\n<\/ul>\n<p>\u5728Java 15\u4e4b\u524d\uff0c\u5f00\u53d1\u4eba\u5458\u53ea\u80fd\u4f7f\u7528final\u5173\u952e\u5b57\u6216\u8303\u56f4\u4fee\u9970\u7b26\u6765\u63a7\u5236\u7ee7\u627f\u3002\u56e0\u6b64\uff0c\u5bc6\u5c01\u7c7b\u4e3aJava\u5f00\u53d1\u4eba\u5458\u5728\u5b9a\u4e49\u7c7b\u5c42\u6b21\u7ed3\u6784\u65f6\u5e26\u6765\u4e86\u989d\u5916\u7684\u7075\u6d3b\u6027\u3002<\/p>\n<p>Java\u7684\u53cd\u5c04API\u8fd8\u63d0\u4f9b\u4e86\u4e24\u79cd\u5904\u7406\u5bc6\u5c01\u7c7b\u7684\u65b0\u65b9\u6cd5\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"token class-name\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>lang<span class=\"token punctuation\">.<\/span>constant<span class=\"token punctuation\">.<\/span><\/span>ClassDesc<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token function\">getPermittedSubclasses<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">boolean<\/span> <span class=\"token function\">isSealed<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>\r\n<\/code><\/pre>\n<h2>2. \u8bb0\u5f55\uff08Records\uff09\uff08\u7b2c\u4e8c\u4e2a\u9884\u89c8\uff09<\/h2>\n<p>\u5728Java 14\u4e2d\uff0c\u8bb0\u5f55\u4f5c\u4e3a\u4e00\u9879\u9884\u89c8\u529f\u80fd\u88ab\u5f15\u5165\uff0c\u65e8\u5728\u51cf\u5c11\u5728\u7f16\u5199\u57fa\u4e8ePOJO\u7684\u6570\u636e\u627f\u8f7d\u7c7b\u65f6\u7684\u6837\u677f\u4ee3\u7801\u3002\u8fd9\u5728Kotlin\u4e2d\u65e9\u5c31\u5b58\u5728\uff0c\u4ee5\u6570\u636e\u7c7b\u7684\u5f62\u5f0f\u3002<\/p>\n<p>\u73b0\u5728\uff0cJava 15 \u63a8\u51fa\u4e86\u8bb0\u5f55\uff08Records\uff09\u7684\u7b2c\u4e8c\u4e2a\u9884\u89c8\u7248\u672c\u3002\u867d\u7136\u6ca1\u6709\u8fdb\u884c\u5927\u7684\u6539\u52a8\uff08\u53ea\u662f\u4e00\u4e9b\u5c0f\u7684\u6dfb\u52a0\uff09\uff0c\u4f46\u662f\u6709\u4e00\u4e9b\u91cd\u8981\u7684\u6f84\u6e05\u548c\u9650\u5236\u9700\u8981\u60a8\u4e86\u89e3\u3002<\/p>\n<ul class=\"post-ul\">\n<li>\u5728Java 15\u4e4b\u524d\uff0c\u53ef\u4ee5\u5728\u8bb0\u5f55\u4e2d\u58f0\u660e\u672c\u5730\u65b9\u6cd5\uff08\u5c3d\u7ba1\u8fd9\u4e0d\u662f\u4e00\u4e2a\u597d\u4e3b\u610f\uff09\u3002\u73b0\u5728\uff0cJEP\u660e\u786e\u7981\u6b62\u5728\u8bb0\u5f55\u4e2d\u58f0\u660e\u672c\u5730\u65b9\u6cd5\u3002\u53ef\u4ee5\u7406\u89e3\u7684\u662f\uff0c\u5b9a\u4e49\u672c\u5730\u65b9\u6cd5\u4f1a\u901a\u8fc7\u5f15\u5165\u5916\u90e8\u72b6\u6001\u4f9d\u8d56\u6765\u524a\u5f31\u8bb0\u5f55\u7684\u72ec\u7279\u5356\u70b9\u3002<\/li>\n<li>\u4e0e\u8bb0\u5f55\u7c7b\u7684\u8bb0\u5f55\u7ec4\u4ef6\u76f8\u5bf9\u5e94\u7684\u9690\u5f0f\u58f0\u660e\u5b57\u6bb5\u662ffinal\u7684\uff0c\u73b0\u5728\u4e0d\u5e94\u8be5\u901a\u8fc7\u53cd\u5c04\u4fee\u6539\u5b83\u4eec\uff0c\u56e0\u4e3a\u8fd9\u5c06\u629b\u51faIllegalAccessException\u3002<\/li>\n<\/ul>\n<p>\u8bb0\u5f55\u5e94\u8be5\u662f\u6570\u636e\u8f7d\u4f53\u7c7b\uff0c\u4f60\u5e94\u8be5\u5b8c\u5168\u907f\u514d\u5728\u5176\u4e2d\u5b9a\u4e49\u672c\u5730\u65b9\u6cd5\u3002<\/p>\n<h3>\u5c01\u88c5\u7c7b\u578b\u7684\u8bb0\u5f55<\/h3>\n<p>\uff08\u6b64\u5904\u5185\u5bb9\u5f85\u7eed\uff09<\/p>\n<p>\u8fd9\u662f\u6587\u7ae0\u300aJava 15\u7684\u65b0\u7279\u6027\u300b\u7684\u7b2c3\u90e8\u5206\uff08\u51714\u90e8\u5206\uff09\u3002<\/p>\n<p>\u6211\u4eec\u77e5\u9053\u8bb0\u5f55\u662f\u6700\u7ec8\u7684\uff0c\u4e0d\u80fd\u88ab\u6269\u5c55\u3002\u5e78\u8fd0\u7684\u662f\uff0c\u8bb0\u5f55\u53ef\u4ee5\u5b9e\u73b0\u63a5\u53e3\u3002<\/p>\n<p>\u6240\u4ee5\u60a8\u53ef\u4ee5\u5b9a\u4e49\u4e00\u4e2a\u5c01\u95ed\u63a5\u53e3\uff0c\u5e76\u4ee5\u4ee5\u4e0b\u65b9\u5f0f\u5728\u60a8\u7684\u8bb0\u5f55\u4e2d\u5b9e\u73b0\u5b83\u4eec\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">sealed<\/span> <span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">\u6c7d\u8f66<\/span> <span class=\"token keyword\">permits<\/span> <span class=\"token constant\">\u5b9d\u9a6c<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">\u5965\u8fea<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span> <span class=\"token punctuation\">}<\/span>\r\n\r\n<span class=\"token keyword\">record<\/span> <span class=\"token class-name\">\u5b9d\u9a6c<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> \u4ef7\u683c<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">\u6c7d\u8f66<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span> <span class=\"token punctuation\">}<\/span>\r\n\r\n<span class=\"token keyword\">record<\/span> <span class=\"token class-name\">\u5965\u8fea<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> \u4ef7\u683c<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> \u578b\u53f7<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">\u6c7d\u8f66<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span> <span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<h3>\u672c\u5730\u8bb0\u5f55<\/h3>\n<p>\u5728\u65b9\u6cd5\u4e2d\uff0c\u53ef\u4ee5\u5b9a\u4e49\u8bb0\u5f55\u6765\u5b58\u50a8\u4e2d\u95f4\u503c\u3002\u4e0e\u5c40\u90e8\u7c7b\u4e0d\u540c\uff0c\u5c40\u90e8\u8bb0\u5f55\u662f\u9690\u5f0f\u9759\u6001\u7684\u3002\u8fd9\u610f\u5473\u7740\u5b83\u4eec\u65e0\u6cd5\u8bbf\u95ee\u5c01\u88c5\u65b9\u6cd5\u7684\u53d8\u91cf\u548c\u5b9e\u4f8b\u6210\u5458\uff0c\u8fd9\u5b9e\u9645\u4e0a\u662f\u4e00\u4e2a\u4f18\u70b9\uff0c\u56e0\u4e3a\u5b83\u9632\u6b62\u4e86\u8bb0\u5f55\u6355\u83b7\u503c\u3002<\/p>\n<p>\u5bf9\u4e8e\u4e4b\u524d\u5fc5\u987b\u521b\u5efa\u8f85\u52a9\u8bb0\u5f55\u7684Java\u5f00\u53d1\u4eba\u5458\u6765\u8bf4\uff0c\u672c\u5730\u8bb0\u5f55\u662f\u4e00\u4e2a\u5de8\u5927\u7684\u4fbf\u5229\u3002<\/p>\n<p>\u901a\u8fc7\u5f15\u5165\u672c\u5730\u8bb0\u5f55\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u5982\u4f55\u5728\u6d41API\u4e2d\u4f7f\u7528\u4ee5\u4e0b\u65b9\u6cd5\u6267\u884c\u503c\u7684\u8ba1\u7b97\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Merchant<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token function\">findTopMerchants<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Merchant<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> merchants<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> month<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n    <span class=\"token comment\">\/\/ \u672c\u5730\u8bb0\u5f55<\/span>\r\n    <span class=\"token keyword\">record<\/span> <span class=\"token class-name\">MerchantSales<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Merchant<\/span> merchant<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">double<\/span> sales<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span>\r\n\r\n    <span class=\"token keyword\">return<\/span> merchants<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>\r\n        <span class=\"token punctuation\">.<\/span><span class=\"token function\">map<\/span><span class=\"token punctuation\">(<\/span>merchant <span class=\"token operator\">-&gt;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">MerchantSales<\/span><span class=\"token punctuation\">(<\/span>merchant<span class=\"token punctuation\">,<\/span> <span class=\"token function\">computeSales<\/span><span class=\"token punctuation\">(<\/span>merchant<span class=\"token punctuation\">,<\/span> month<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>\r\n        <span class=\"token punctuation\">.<\/span><span class=\"token function\">sorted<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>m1<span class=\"token punctuation\">,<\/span> m2<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token class-name\">Double<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">compare<\/span><span class=\"token punctuation\">(<\/span>m2<span class=\"token punctuation\">.<\/span><span class=\"token function\">sales<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> m1<span class=\"token punctuation\">.<\/span><span class=\"token function\">sales<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>\r\n        <span class=\"token punctuation\">.<\/span><span class=\"token function\">map<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">MerchantSales<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">merchant<\/span><span class=\"token punctuation\">)<\/span>\r\n        <span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">toList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<h2>\u7ed3\u8bba<\/h2>\n<p>\u5728Java 15\u4e2d\uff0c\u4e0a\u8ff0\u4e24\u4e2a\u662f\u4e3b\u8981\u7684\u8bed\u8a00\u7279\u6027\u3002\u6b64\u5916\uff0c\u6211\u4eec\u8fd8\u6709\u7b2c\u4e8c\u4e2a\u9884\u89c8\u7248\u7684\u6a21\u5f0f\u5339\u914d\u4f9b\u7528\u6237\u53cd\u9988\uff0c\u6587\u672c\u5757\u73b0\u5728\u5df2\u6210\u4e3a\u6807\u51c6\u7279\u6027\uff0c\u8fd8\u6709\u4e00\u9879\u91cd\u8981\u7684\u65b0\u7279\u6027\u2014\u2014\u9690\u85cf\u7c7b\u3002<\/p>\n<p>\u9690\u85cf\u7c7b\u662f\u4e00\u4e2a\u4e0e\u6846\u67b6\u5f00\u53d1\u4eba\u5458\u76f8\u5173\u7684JVM\u529f\u80fd\u3002\u5b83\u5141\u8bb8\u901a\u8fc7Lookup::defineHiddenClass\u5b9a\u4e49\u7c7b\u5b9e\u73b0\uff0c\u4f7f\u5176\u65e0\u6cd5\u88ab\u53d1\u73b0\u3002\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0c\u8fd9\u4e9b\u7c7b\u65e2\u65e0\u6cd5\u4f7f\u7528Class.forName\u627e\u5230\uff0c\u4e5f\u65e0\u6cd5\u901a\u8fc7\u5b57\u8282\u7801\u76f4\u63a5\u5f15\u7528\u3002<\/p>\n<p>\u4ee5\u4e0b\u662fJava 15\u5f15\u5165\u7684\u4e3b\u8981\u53d8\u66f4\u603b\u7ed3\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6309\u7167\u6bcf\u516d\u4e2a\u6708\u53d1\u5e03\u4e00\u6b21\u7684\u60ef\u4f8b\uff0c\u57282020\u5e743\u670817\u65e5\u53d1\u5e03\u4e86Java 14\u4e4b\u540e\uff0c\u6211\u4eec\u73b0\u5728\u5373\u5c06\u8fce\u67652020\u5e749\u670815 [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[2304,761,1244,2305,180],"class_list":["post-892","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-java-15","tag-java"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Java 15\u65b0\u7279\u6027\u5168\u9762\u89e3\u6790\uff1a2020\u5e74\u5fc5\u77e5\u7684Java\u8bed\u8a00\u66f4\u65b0\u4e0e\u6539\u8fdb - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u5168\u9762\u89e3\u6790Java 15\u7684\u65b0\u7279\u6027\u4e0e\u6539\u8fdb\uff0c\u5305\u62ec\u6587\u672c\u5757\u3001\u8bb0\u5f55\u7c7b\u3001\u5bc6\u5c01\u7c7b\u7b49\u91cd\u8981\u66f4\u65b0\u3002\u4e86\u89e3Java 15\u5982\u4f55\u63d0\u5347\u5f00\u53d1\u6548\u7387\uff0c\u4ee5\u53ca\u8fd9\u4e9b\u65b0\u7279\u6027\u5bf9Java\u5e94\u7528\u7a0b\u5e8f\u7684\u5f71\u54cd\u3002Java\u5f00\u53d1\u8005\u5fc5\u8bfb\u7684\u5347\u7ea7\u6307\u5357\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/java-15\u7684\u65b0\u7279\u6027\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java 15\u65b0\u7279\u6027\u5168\u9762\u89e3\u6790\uff1a2020\u5e74\u5fc5\u77e5\u7684Java\u8bed\u8a00\u66f4\u65b0\u4e0e\u6539\u8fdb\" \/>\n<meta property=\"og:description\" content=\"\u5168\u9762\u89e3\u6790Java 15\u7684\u65b0\u7279\u6027\u4e0e\u6539\u8fdb\uff0c\u5305\u62ec\u6587\u672c\u5757\u3001\u8bb0\u5f55\u7c7b\u3001\u5bc6\u5c01\u7c7b\u7b49\u91cd\u8981\u66f4\u65b0\u3002\u4e86\u89e3Java 15\u5982\u4f55\u63d0\u5347\u5f00\u53d1\u6548\u7387\uff0c\u4ee5\u53ca\u8fd9\u4e9b\u65b0\u7279\u6027\u5bf9Java\u5e94\u7528\u7a0b\u5e8f\u7684\u5f71\u54cd\u3002Java\u5f00\u53d1\u8005\u5fc5\u8bfb\u7684\u5347\u7ea7\u6307\u5357\u3002\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/java-15\u7684\u65b0\u7279\u6027\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2024-01-31T15:14:51+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-08-03T07:53:00+00:00\" \/>\n<meta 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