{"id":202679,"date":"2025-05-22T10:05:54","date_gmt":"2025-05-22T02:05:54","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202679\/"},"modified":"2025-05-22T10:05:54","modified_gmt":"2025-05-22T02:05:54","slug":"java-%e5%87%bd%e6%95%b0%e6%80%a7%e8%83%bd%e5%88%86%e6%9e%90%e5%92%8c%e5%9f%ba%e5%87%86%e6%b5%8b%e8%af%95%e6%8a%80%e5%b7%a7","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202679\/","title":{"rendered":"Java \u51fd\u6570\u6027\u80fd\u5206\u6790\u548c\u57fa\u51c6\u6d4b\u8bd5\u6280\u5de7"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>Java \u51fd\u6570\u6027\u80fd\u5206\u6790\u548c\u57fa\u51c6\u6d4b\u8bd5\u6280\u5de7<\/h1>\n<p>\u4eca\u65e5\u4e0d\u80af\u57cb\u5934\uff0c\u660e\u65e5\u4f55\u4ee5\u62ac\u5934\uff01\u6bcf\u65e5\u4e00\u53e5\u52aa\u529b\u81ea\u5df1\u7684\u8bdd\u54c8\u54c8~\u54c8\u55bd\uff0c\u4eca\u5929\u6211\u5c06\u7ed9\u5927\u5bb6\u5e26\u6765\u4e00\u7bc7<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300aJava \u51fd\u6570\u6027\u80fd\u5206\u6790\u548c\u57fa\u51c6\u6d4b\u8bd5\u6280\u5de7\u300b<\/span>\uff0c\u4e3b\u8981\u5185\u5bb9\u662f\u8bb2\u89e3<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\u7b49\u7b49\uff0c\u611f\u5174\u8da3\u7684\u670b\u53cb\u53ef\u4ee5\u6536\u85cf\u6216\u8005\u6709\u66f4\u597d\u7684\u5efa\u8bae\u5728\u8bc4\u8bba\u63d0\u51fa\uff0c\u6211\u90fd\u4f1a\u8ba4\u771f\u770b\u7684\uff01\u5927\u5bb6\u4e00\u8d77\u8fdb\u6b65\uff0c\u4e00\u8d77\u5b66\u4e60\uff01<\/p>\n<p>Java \u51fd\u6570\u6027\u80fd\u5206\u6790\u548c\u57fa\u51c6\u6d4b\u8bd5\u6280\u5de7\u5305\u62ec\uff1a\u5206\u6790\u6280\u672f\uff1a\u5229\u7528 Java Profiler\u3001System Out \u6216 JMH \u5206\u6790\u51fd\u6570\u6267\u884c\u65f6\u95f4\u3001\u5185\u5b58\u6d88\u8017\u548c\u7ebf\u7a0b\u4ea4\u4e92\u3002\u57fa\u51c6\u6d4b\u8bd5\u6280\u672f\uff1a\u4f7f\u7528\u57fa\u51c6\u6d4b\u8bd5\u6846\u67b6\u548c\u5fae\u57fa\u51c6\u6d4b\u8bd5\u9694\u79bb\u548c\u6bd4\u8f83\u51fd\u6570\u6027\u80fd\uff0c\u96c6\u6210\u6d4b\u8bd5\u57fa\u51c6\u6d4b\u8bd5\u590d\u6742\u573a\u666f\u3002\u5b9e\u6218\u6848\u4f8b\uff1a\u901a\u8fc7\u5206\u6790\u548c\u57fa\u51c6\u6d4b\u8bd5\uff0c\u786e\u5b9a sort \u51fd\u6570\u7684\u5faa\u73af\u74f6\u9888\uff0c\u5e76\u901a\u8fc7\u5b9e\u65bd\u66f4\u6709\u6548\u7684\u7b97\u6cd5\u4f18\u5316\u4e86\u6027\u80fd\uff0c\u5c06\u6267\u884c\u65f6\u95f4\u51cf\u5c11\u4e86 50%\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241026\/1729931128671ca77865118.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>Java \u51fd\u6570\u6027\u80fd\u5206\u6790\u548c\u57fa\u51c6\u6d4b\u8bd5\u6280\u5de7<\/strong><\/p>\n<p><strong>\u7b80\u4ecb<\/strong><\/p>\n<p>\u51fd\u6570\u6027\u80fd\u4f18\u5316\u662f\u63d0\u9ad8 Java \u5e94\u7528\u7a0b\u5e8f\u6027\u80fd\u7684\u5173\u952e\u3002\u901a\u8fc7\u51c6\u786e\u5206\u6790\u548c\u57fa\u51c6\u6d4b\u8bd5\u51fd\u6570\uff0c\u6211\u4eec\u53ef\u4ee5\u8bc6\u522b\u6027\u80fd\u74f6\u9888\u5e76\u8fdb\u884c\u6709\u9488\u5bf9\u6027\u7684\u4f18\u5316\u3002\u672c\u6587\u5c06\u63a2\u8ba8 Java \u4e2d\u51fd\u6570\u6027\u80fd\u5206\u6790\u548c\u57fa\u51c6\u6d4b\u8bd5\u7684\u6700\u4f73\u5b9e\u8df5\u3002<\/p>\n<p><strong>\u5206\u6790\u6280\u672f<\/strong><\/p>\n<ul>\n<li><strong>Java Profiler\uff08JProfiler\u3001YourKit \u7b49\uff09\uff1a<\/strong>\u5f3a\u5927\u7684\u5de5\u5177\u53ef\u5206\u6790\u5e94\u7528\u7a0b\u5e8f\u6027\u80fd\uff0c\u5e76\u63d0\u4f9b\u6709\u5173\u51fd\u6570\u6267\u884c\u65f6\u95f4\u3001\u5185\u5b58\u6d88\u8017\u548c\u7ebf\u7a0b\u4ea4\u4e92\u7684\u6df1\u5165\u89c1\u89e3\u3002<\/li>\n<li><strong>System Out \u4e0e System Err\uff1a<\/strong>\u624b\u52a8\u5728\u4ee3\u7801\u4e2d\u6dfb\u52a0\u8ba1\u65f6\u5668\uff0c\u4ee5\u6d4b\u91cf\u51fd\u6570\u6267\u884c\u65f6\u95f4\uff0c\u5c3d\u7ba1\u7c92\u5ea6\u6709\u9650\u3002<\/li>\n<li><strong>JMH\uff08Java \u5fae\u57fa\u51c6\u6d4b\u8bd5\u5de5\u5177\uff09\uff1a<\/strong>\u4e13\u95e8\u7528\u4e8e\u57fa\u51c6\u6d4b\u8bd5 Java \u65b9\u6cd5\uff0c\u63d0\u4f9b\u7cbe\u786e\u7684\u8ba1\u65f6\u548c\u53ef\u5b9a\u5236\u7684\u57fa\u51c6\u6d4b\u8bd5\u573a\u666f\u3002<\/li>\n<\/ul>\n<p><strong>\u57fa\u51c6\u6d4b\u8bd5\u6280\u672f<\/strong><\/p>\n<ul>\n<li><strong>\u57fa\u51c6\u6d4b\u8bd5\u6846\u67b6\uff08JMH\u3001BenchmarkDotNet \u7b49\uff09\uff1a<\/strong>\u63d0\u4f9b\u4e86\u4e00\u5957\u57fa\u51c6\u6d4b\u8bd5\u5de5\u5177\uff0c\u4ee5\u81ea\u52a8\u5316\u57fa\u51c6\u6d4b\u8bd5\u8fc7\u7a0b\u3002<\/li>\n<li><strong>\u5fae\u57fa\u51c6\u6d4b\u8bd5\uff1a<\/strong>\u4e13\u6ce8\u4e8e\u5355\u4e2a\u65b9\u6cd5\u6216\u5c0f\u4ee3\u7801\u6bb5\u7684\u6027\u80fd\uff0c\u4ee5\u9694\u79bb\u548c\u5206\u6790\u7279\u5b9a\u51fd\u6570\u884c\u4e3a\u3002<\/li>\n<li><strong>\u96c6\u6210\u6d4b\u8bd5\uff1a<\/strong>\u57fa\u51c6\u6d4b\u8bd5\u66f4\u590d\u6742\u7684\u5e94\u7528\u7a0b\u5e8f\u573a\u666f\uff0c\u5305\u62ec\u591a\u4e2a\u51fd\u6570\u4ea4\u4e92\u548c\u4f9d\u8d56\u5173\u7cfb\u3002<\/li>\n<\/ul>\n<p><strong>\u5b9e\u6218\u6848\u4f8b<\/strong><\/p>\n<p>\u8003\u8651\u4ee5\u4e0b Java \u51fd\u6570\uff0c\u5b83\u5c06\u4e00\u4e2a\u6574\u6570\u6570\u7ec4\u6392\u5e8f\uff1a<\/p>\n<pre>public static int[] sort(int[] arr) {\n    for (int i = 0; i &lt; arr.length; i++) {\n        int min = i;\n        for (int j = i + 1; j &lt; arr.length; j++) {\n            if (arr[j] &lt; arr[min]) {\n                min = j;\n            }\n        }\n        int temp = arr[min];\n        arr[min] = arr[i];\n        arr[i] = temp;\n    }\n    return arr;\n}<\/pre>\n<p><strong>\u6027\u80fd\u5206\u6790<\/strong><\/p>\n<ul>\n<li>\u4f7f\u7528 JProfiler \u5206\u6790\u4ee3\u7801\uff0c\u53d1\u73b0\u51fd\u6570 <code>sort<\/code> \u5360\u7528\u5e94\u7528\u7a0b\u5e8f 80% \u7684\u6267\u884c\u65f6\u95f4\u3002<\/li>\n<li>\u901a\u8fc7\u8fdb\u4e00\u6b65\u5206\u6790\uff0c\u53d1\u73b0 <code>sort<\/code> \u4e2d\u7684\u5faa\u73af\u5bfc\u81f4\u4e86\u4e3b\u8981\u7684\u6027\u80fd\u74f6\u9888\u3002<\/li>\n<\/ul>\n<p><strong>\u57fa\u51c6\u6d4b\u8bd5<\/strong><\/p>\n<ul>\n<li>\u4f7f\u7528 JMH \u8bbe\u7f6e\u57fa\u51c6\u6d4b\u8bd5\uff0c\u5c06 <code>sort<\/code> \u51fd\u6570\u7684\u6027\u80fd\u4e0e\u5176\u4ed6\u6392\u5e8f\u7b97\u6cd5\u8fdb\u884c\u6bd4\u8f83\u3002<\/li>\n<li>\u57fa\u51c6\u6d4b\u8bd5\u663e\u793a\uff0c<code>sort<\/code> \u6bd4 QuickSort \u548c MergeSort \u7b49\u5176\u4ed6\u9ad8\u6548\u7b97\u6cd5\u6162\u5f97\u591a\u3002<\/li>\n<\/ul>\n<p><strong>\u4f18\u5316<\/strong><\/p>\n<ul>\n<li>\u901a\u8fc7\u5206\u6790\u548c\u57fa\u51c6\u6d4b\u8bd5\uff0c\u6211\u4eec\u786e\u5b9a <code>sort<\/code> \u51fd\u6570\u7684\u6027\u80fd\u53ef\u4ee5\u901a\u8fc7\u5b9e\u65bd\u66f4\u6709\u6548\u7684\u6392\u5e8f\u7b97\u6cd5\uff08\u5982 QuickSort\uff09\u6765\u63d0\u9ad8\u3002<\/li>\n<li>\u5b9e\u65bd\u540e\uff0c\u5e94\u7528\u7a0b\u5e8f\u6027\u80fd\u663e\u7740\u63d0\u9ad8\uff0c<code>sort<\/code> \u51fd\u6570\u7684\u6267\u884c\u65f6\u95f4\u51cf\u5c11\u4e86 50%\u3002<\/li>\n<\/ul>\n<p><strong>\u7ed3\u8bba<\/strong><\/p>\n<p>\u901a\u8fc7\u9075\u5faa\u8fd9\u4e9b\u6280\u672f\uff0c\u6211\u4eec\u53ef\u4ee5\u6709\u6548\u5730\u5206\u6790\u548c\u57fa\u51c6\u6d4b\u8bd5 Java \u51fd\u6570\u7684\u6027\u80fd\u3002\u5b9e\u6218\u6848\u4f8b\u8bc1\u660e\u4e86\u6027\u80fd\u4f18\u5316\u5982\u4f55\u901a\u8fc7\u8bc6\u522b\u548c\u89e3\u51b3\u74f6\u9888\u6765\u6781\u5927\u5730\u63d0\u9ad8\u5e94\u7528\u7a0b\u5e8f\u6027\u80fd\u3002<\/p>\n<p>\u4eca\u5929\u5173\u4e8e\u300aJava \u51fd\u6570\u6027\u80fd\u5206\u6790\u548c\u57fa\u51c6\u6d4b\u8bd5\u6280\u5de7\u300b\u7684\u5185\u5bb9\u5c31\u4ecb\u7ecd\u5230\u8fd9\u91cc\u4e86\uff0c\u662f\u4e0d\u662f\u5b66\u8d77\u6765\u4e00\u76ee\u4e86\u7136\uff01\u60f3\u8981\u4e86\u89e3\u66f4\u591a\u5173\u4e8ejava,\u6027\u80fd\u5206\u6790\u7684\u5185\u5bb9\u8bf7\u5173\u6ce8\u516c\u4f17\u53f7\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java \u51fd\u6570\u6027\u80fd\u5206\u6790\u548c\u57fa\u51c6\u6d4b\u8bd5&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-202679","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202679","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=202679"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202679\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202679"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202679"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202679"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}