{"id":202570,"date":"2025-05-22T10:15:41","date_gmt":"2025-05-22T02:15:41","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202570\/"},"modified":"2025-05-22T10:15:41","modified_gmt":"2025-05-22T02:15:41","slug":"%e5%a6%82%e4%bd%95%e9%80%9a%e8%bf%87%e5%9f%ba%e5%87%86%e6%b5%8b%e8%af%95%e5%ba%a6%e9%87%8f%e5%92%8c%e6%94%b9%e8%bf%9b-java-%e5%87%bd%e6%95%b0%e6%80%a7%e8%83%bd%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202570\/","title":{"rendered":"\u5982\u4f55\u901a\u8fc7\u57fa\u51c6\u6d4b\u8bd5\u5ea6\u91cf\u548c\u6539\u8fdb Java \u51fd\u6570\u6027\u80fd\uff1f"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>\u5982\u4f55\u901a\u8fc7\u57fa\u51c6\u6d4b\u8bd5\u5ea6\u91cf\u548c\u6539\u8fdb Java \u51fd\u6570\u6027\u80fd\uff1f<\/h1>\n<p><span style=\"font-size: 15px\">\u5b66\u4e60\u77e5\u8bc6\u8981\u5584\u4e8e\u601d\u8003\uff0c\u601d\u8003\uff0c\u518d\u601d\u8003\uff01\u4eca\u5929\u5c0f\u7f16\u5c31\u7ed9\u5927\u5bb6\u5e26\u6765<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300a\u5982\u4f55\u901a\u8fc7\u57fa\u51c6\u6d4b\u8bd5\u5ea6\u91cf\u548c\u6539\u8fdb Java \u51fd\u6570\u6027\u80fd\uff1f\u300b<\/span>\uff0c\u4ee5\u4e0b\u5185\u5bb9\u4e3b\u8981\u5305\u542b<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u4f60\u6b63\u5728\u5b66\u4e60\u6216\u51c6\u5907\u5b66\u4e60<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u6587\u7ae0<\/span>\uff0c\u5c31\u90fd\u4e0d\u8981\u9519\u8fc7\u672c\u6587\u5566~\u8ba9\u6211\u4eec\u4e00\u8d77\u6765\u770b\u770b\u5427\uff0c\u80fd\u5e2e\u52a9\u5230\u4f60\u5c31\u66f4\u597d\u4e86\uff01<\/span><\/p>\n<p>\u901a\u8fc7\u57fa\u51c6\u6d4b\u8bd5\u5ea6\u91cf Java \u51fd\u6570\u6027\u80fd\u81f3\u5173\u91cd\u8981\uff0c\u53ef\u4ee5\u8861\u91cf\u5f53\u524d\u6027\u80fd\u3001\u786e\u5b9a\u74f6\u9888\u548c\u8ddf\u8e2a\u6539\u8fdb\u3002\u4f7f\u7528 JMH \u548c Benchmark Harness \u7b49\u5de5\u5177\u8fdb\u884c\u57fa\u51c6\u6d4b\u8bd5\uff0c\u5206\u6790\u7ed3\u679c\u53ef\u8bc6\u522b\u6027\u80fd\u74f6\u9888\uff0c\u5982 HashMap \u6027\u80fd\u53ef\u901a\u8fc7\u4f7f\u7528 ConcurrentHashMap \u63d0\u9ad8\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241026\/1729918880671c77a0507c3.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>\u5982\u4f55\u901a\u8fc7\u57fa\u51c6\u6d4b\u8bd5\u5ea6\u91cf\u548c\u6539\u8fdb Java \u51fd\u6570\u6027\u80fd<\/strong><\/p>\n<p><strong>\u80cc\u666f<\/strong><\/p>\n<p>\u57fa\u51c6\u6d4b\u8bd5\u5bf9\u4e8e\u6d4b\u91cf\u548c\u6539\u8fdb Java \u51fd\u6570\u7684\u6027\u80fd\u81f3\u5173\u91cd\u8981\u3002\u901a\u8fc7\u5efa\u7acb\u57fa\u51c6\uff0c\u60a8\u53ef\u4ee5\u8861\u91cf\u51fd\u6570\u7684\u5f53\u524d\u6027\u80fd\uff0c\u786e\u5b9a\u6027\u80fd\u74f6\u9888\uff0c\u5e76\u8ddf\u8e2a\u6539\u8fdb\u540e\u7684\u53d8\u5316\u3002<\/p>\n<p><strong>\u57fa\u51c6\u6d4b\u8bd5\u5de5\u5177<\/strong><\/p>\n<p>Java \u63d0\u4f9b\u4e86\u51e0\u4e2a\u57fa\u51c6\u6d4b\u8bd5\u5de5\u5177\uff0c\u4f8b\u5982\uff1a<\/p>\n<ul>\n<li><strong>JMH (Java \u5fae\u57fa\u51c6)<\/strong>\uff1a\u7528\u4e8e\u5bf9\u5fae\u670d\u52a1\u548c\u7cfb\u7edf\u8fdb\u884c\u57fa\u51c6\u6d4b\u8bd5\u3002<\/li>\n<li><strong>Benchmark Harness<\/strong>\uff1a\u4e00\u79cd\u5185\u7f6e\u57fa\u51c6\u6d4b\u8bd5\u6846\u67b6\uff0c\u53ef\u7528\u4e8e\u4ece Java \u4e2d\u8fdb\u884c\u57fa\u672c\u57fa\u51c6\u6d4b\u8bd5\u3002<\/li>\n<li><strong>GATLING<\/strong>\uff1a\u7528\u4e8e\u8fdb\u884c\u8d1f\u8f7d\u548c\u6027\u80fd\u6d4b\u8bd5\u7684\u5de5\u5177\uff0c\u53ef\u5305\u62ec\u57fa\u51c6\u6d4b\u8bd5\u529f\u80fd\u3002<\/li>\n<\/ul>\n<p><strong>\u5b9e\u6218\u6848\u4f8b\uff1a\u57fa\u51c6\u6d4b\u8bd5 HashMap<\/strong><\/p>\n<p>\u8003\u8651\u4e00\u4e2a\u5c06\u952e\u503c\u5bf9\u5b58\u50a8\u5728 HashMap \u4e2d\u7684\u51fd\u6570\uff1a<\/p>\n<pre>public Map&lt;String, Integer&gt; getHashMap(List&lt;String&gt; keys, List&lt;Integer&gt; values) {\n    Map&lt;String, Integer&gt; map = new HashMap&lt;&gt;();\n    for (int i = 0; i &lt; keys.size(); i++) {\n        map.put(keys.get(i), values.get(i));\n    }\n    return map;\n}<\/pre>\n<p><strong>\u4f7f\u7528 JMH \u8fdb\u884c\u57fa\u51c6\u6d4b\u8bd5<\/strong><\/p>\n<p>\u8981\u4f7f\u7528 JMH \u5bf9\u6b64\u51fd\u6570\u8fdb\u884c\u57fa\u51c6\u6d4b\u8bd5\uff0c\u53ef\u4ee5\u4f7f\u7528\u6b64\u4ee3\u7801\uff1a<\/p>\n<pre>@Benchmark\n@BenchmarkMode(Mode.Throughput)\npublic Map&lt;String, Integer&gt; getHashMap_jmh(BenchmarkState state) {\n    return getHashMap(state.keys, state.values);\n}\n\npublic static class BenchmarkState {\n    \/\/ JMH \u5c06\u81ea\u52a8\u521b\u5efa\u8fd9\u4e2a\u7c7b\u7684\u4e00\u4e2a\u5b9e\u4f8b\uff0c\u5e76\u6839\u636e\u9700\u8981\u7528\u5b83\u4e3a\u57fa\u51c6\u65b9\u6cd5\u4f20\u9012\u4e00\u4e9b\u72b6\u6001\u3002\n    @Param({ \"1000\", \"100000\" })\n    public int size;\n    public List&lt;String&gt; keys;\n    public List&lt;Integer&gt; values;\n\n    @Setup\n    public void setup() {\n        keys = new ArrayList&lt;&gt;();\n        values = new ArrayList&lt;&gt;();\n        for (int i = 0; i &lt; size; i++) {\n            keys.add(\"key\" + i);\n            values.add(i);\n        }\n    }\n}<\/pre>\n<p><strong>\u4f7f\u7528 Benchmark Harness \u8fdb\u884c\u57fa\u51c6\u6d4b\u8bd5<\/strong><\/p>\n<p>\u8981\u4f7f\u7528 Benchmark Harness \u5bf9\u6b64\u51fd\u6570\u8fdb\u884c\u57fa\u51c6\u6d4b\u8bd5\uff0c\u53ef\u4ee5\u4f7f\u7528\u6b64\u4ee3\u7801\uff1a<\/p>\n<pre>public class GetHashMapBenchmark {\n\n    @Benchmark\n    public Map&lt;String, Integer&gt; getHashMap() {\n        return getHashMap(keyList, valueList);\n    }\n\n    private List&lt;String&gt; keyList = new ArrayList&lt;&gt;();\n    private List&lt;Integer&gt; valueList = new ArrayList&lt;&gt;();\n\n    @Before\n    public void setUp() {\n        for (int i = 0; i &lt; 1000; i++) {\n            keyList.add(\"key\" + i);\n            valueList.add(i);\n        }\n    }\n}<\/pre>\n<p><strong>\u6539\u8fdb\u6027\u80fd<\/strong><\/p>\n<p>\u4e00\u65e6\u5bf9\u51fd\u6570\u8fdb\u884c\u4e86\u57fa\u51c6\u6d4b\u8bd5\uff0c\u5c31\u53ef\u4ee5\u786e\u5b9a\u6027\u80fd\u74f6\u9888\u5e76\u5b9e\u73b0\u6539\u8fdb\u3002\u4f8b\u5982\uff0c\u4e3a\u4e86\u63d0\u9ad8 HashMap \u6027\u80fd\uff0c\u53ef\u4ee5\u8003\u8651\u4f7f\u7528 <strong>ConcurrentHashMap<\/strong>\u3002<\/p>\n<p><strong>\u7ed3\u8bed<\/strong><\/p>\n<p>\u57fa\u51c6\u6d4b\u8bd5\u662f\u5ea6\u91cf\u548c\u6539\u8fdb Java \u51fd\u6570\u6027\u80fd\u7684\u5173\u952e\u5b9e\u8df5\u3002\u901a\u8fc7\u4f7f\u7528\u57fa\u51c6\u6d4b\u8bd5\u5de5\u5177\uff0c\u60a8\u53ef\u4ee5\u8bc6\u522b\u6027\u80fd\u74f6\u9888\u5e76\u5b9e\u73b0\u6539\u8fdb\uff0c\u4ece\u800c\u63d0\u5347\u5e94\u7528\u7a0b\u5e8f\u7684\u6574\u4f53\u6548\u7387\u3002<\/p>\n<p>\u597d\u4e86\uff0c\u672c\u6587\u5230\u6b64\u7ed3\u675f\uff0c\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u300a\u5982\u4f55\u901a\u8fc7\u57fa\u51c6\u6d4b\u8bd5\u5ea6\u91cf\u548c\u6539\u8fdb Java \u51fd\u6570\u6027\u80fd\uff1f\u300b\uff0c\u5e0c\u671b\u672c\u6587\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff01\u5173\u6ce8\u516c\u4f17\u53f7\uff0c\u7ed9\u5927\u5bb6\u5206\u4eab\u66f4\u591a\u6587\u7ae0\u77e5\u8bc6\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5982\u4f55\u901a\u8fc7\u57fa\u51c6\u6d4b\u8bd5\u5ea6\u91cf\u548c\u6539\u8fdb Ja&#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-202570","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202570","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=202570"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202570\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202570"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202570"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202570"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}