{"id":202612,"date":"2025-05-22T09:08:55","date_gmt":"2025-05-22T01:08:55","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202612\/"},"modified":"2025-05-22T09:08:55","modified_gmt":"2025-05-22T01:08:55","slug":"java-%e5%87%bd%e6%95%b0%e6%89%a7%e8%a1%8c%e6%95%88%e7%8e%87%e4%bd%8e%e7%9a%84%e5%8e%9f%e5%9b%a0%e6%98%af%e4%bb%80%e4%b9%88%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202612\/","title":{"rendered":"Java \u51fd\u6570\u6267\u884c\u6548\u7387\u4f4e\u7684\u539f\u56e0\u662f\u4ec0\u4e48\uff1f"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>Java \u51fd\u6570\u6267\u884c\u6548\u7387\u4f4e\u7684\u539f\u56e0\u662f\u4ec0\u4e48\uff1f<\/h1>\n<p>\u4eca\u5929\u5c06\u7ed9\u5927\u5bb6\u5e26\u6765<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300aJava \u51fd\u6570\u6267\u884c\u6548\u7387\u4f4e\u7684\u539f\u56e0\u662f\u4ec0\u4e48\uff1f\u300b<\/span>\uff0c\u611f\u5174\u8da3\u7684\u670b\u53cb\u8bf7\u7ee7\u7eed\u770b\u4e0b\u53bb\u5427\uff01\u4ee5\u4e0b\u5185\u5bb9\u5c06\u4f1a\u6d89\u53ca\u5230<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u4f60\u662f\u6b63\u5728\u5b66\u4e60<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u6587\u7ae0<\/span>\u6216\u8005\u5df2\u7ecf\u662f\u5927\u4f6c\u7ea7\u522b\u4e86\uff0c\u90fd\u975e\u5e38\u6b22\u8fce\u4e5f\u5e0c\u671b\u5927\u5bb6\u90fd\u80fd\u7ed9\u6211\u5efa\u8bae\u8bc4\u8bba\u54c8~\u5e0c\u671b\u80fd\u5e2e\u52a9\u5230\u5927\u5bb6\uff01<\/p>\n<p>Java \u51fd\u6570\u6267\u884c\u6548\u7387\u4f4e\u7684\u539f\u56e0\u5305\u62ec\u5185\u5b58\u6cc4\u6f0f\u3001\u6027\u80fd\u74f6\u9888\u3001\u8fc7\u5ea6\u540c\u6b65\u548c\u5783\u573e\u56de\u6536\u5f00\u9500\u3002\u4f18\u5316\u63aa\u65bd\u5305\u62ec\uff1a\u4f7f\u7528 WeakReference \u548c Finalizer \u89e3\u51b3\u5185\u5b58\u6cc4\u6f0f\uff1b\u901a\u8fc7\u4ee3\u7801\u5206\u6790\u3001\u4f18\u5316\u7b97\u6cd5\u548c\u4f7f\u7528\u7f13\u5b58\u6d88\u9664\u6027\u80fd\u74f6\u9888\uff1b\u8c28\u614e\u4f7f\u7528\u540c\u6b65\uff0c\u4f7f\u7528\u8bfb\u5199\u9501\u548c\u65e0\u9501\u6570\u636e\u7ed3\u6784\uff1b\u51cf\u5c11\u5bf9\u8c61\u521b\u5efa\u548c\u8c03\u4f18\u5783\u573e\u56de\u6536\u53c2\u6570\u4ee5\u51cf\u8f7b\u5783\u573e\u56de\u6536\u5f00\u9500\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241026\/1729923993671c8b99d5a5d.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>Java \u51fd\u6570\u6267\u884c\u6548\u7387\u4f4e\u7684\u539f\u56e0\u53ca\u5176\u4f18\u5316<\/strong><\/p>\n<p>Java \u51fd\u6570\u6267\u884c\u6548\u7387\u4f4e\u53ef\u80fd\u6709\u591a\u79cd\u539f\u56e0\u3002\u4e86\u89e3\u8fd9\u4e9b\u539f\u56e0\u5e76\u5e94\u7528\u9002\u5f53\u7684\u4f18\u5316\u6280\u672f\u5bf9\u4e8e\u63d0\u9ad8\u5e94\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\u81f3\u5173\u91cd\u8981\u3002\u672c\u6587\u5c06\u63a2\u8ba8\u5bfc\u81f4 Java \u51fd\u6570\u6267\u884c\u6548\u7387\u4f4e\u7684\u4e00\u4e9b\u5e38\u89c1\u539f\u56e0\u5e76\u63d0\u4f9b\u5b9e\u6218\u6848\u4f8b\u6765\u5c55\u793a\u5982\u4f55\u89e3\u51b3\u8fd9\u4e9b\u95ee\u9898\u3002<\/p>\n<p><strong>1. \u5185\u5b58\u6cc4\u6f0f<\/strong><\/p>\n<p>\u5185\u5b58\u6cc4\u6f0f\u662f\u6307 Java \u5bf9\u8c61\u5728\u4e0d\u518d\u88ab\u5f15\u7528\u65f6\u4ecd\u4fdd\u7559\u5728\u5185\u5b58\u4e2d\uff0c\u5bfc\u81f4\u5185\u5b58\u4f7f\u7528\u4e0d\u65ad\u589e\u52a0\u3002\u8fd9\u4f1a\u964d\u4f4e\u5e94\u7528\u7a0b\u5e8f\u7684\u6267\u884c\u901f\u5ea6\u5e76\u6700\u7ec8\u5bfc\u81f4\u5185\u5b58\u4e0d\u8db3\u9519\u8bef\u3002\u4e3a\u4e86\u89e3\u51b3\u5185\u5b58\u6cc4\u6f0f\uff0c\u8bf7\u4f7f\u7528\u4ee5\u4e0b\u6280\u672f\uff1a<\/p>\n<ul>\n<li><code>WeakReference<\/code>\uff1a\u4f7f\u7528 <code>WeakReference<\/code> \u5141\u8bb8\u5783\u573e\u56de\u6536\u5668\u5728\u5bf9\u8c61\u4e0d\u518d\u53ef\u7528\u65f6\u81ea\u52a8\u56de\u6536\u5185\u5b58\u3002<\/li>\n<li><code>Finalizer<\/code>\uff1a<code>Finalizer<\/code> \u5728\u5783\u573e\u56de\u6536\u4e4b\u524d\u5bf9\u5bf9\u8c61\u8fdb\u884c\u6e05\u7406\uff0c\u91ca\u653e\u8d44\u6e90\u3002<\/li>\n<\/ul>\n<p><strong>2. \u6027\u80fd\u74f6\u9888<\/strong><\/p>\n<p>\u4ee3\u7801\u4e2d\u53ef\u80fd\u5b58\u5728\u5bfc\u81f4\u6267\u884c\u901f\u5ea6\u74f6\u9888\u7684\u7279\u5b9a\u90e8\u5206\u3002\u8fd9\u4e9b\u74f6\u9888\u53ef\u80fd\u662f\u7b97\u6cd5\u590d\u6742\u5ea6\u3001\u6570\u636e\u7ed3\u6784\u4f7f\u7528\u6216\u5916\u90e8\u7cfb\u7edf\u4ea4\u4e92\u7b49\u5404\u4e2a\u65b9\u9762\u9020\u6210\u7684\u3002\u4e3a\u4e86\u89e3\u51b3\u6027\u80fd\u74f6\u9888\uff0c\u8bf7\u4f7f\u7528\u4ee5\u4e0b\u65b9\u6cd5\uff1a<\/p>\n<ul>\n<li><strong>\u5206\u6790\u4ee3\u7801\uff1a<\/strong>\u4f7f\u7528\u6027\u80fd\u5206\u6790\u5de5\u5177\uff08\u5982 JProfiler \u6216 JMeter\uff09\u6765\u6807\u8bc6\u6267\u884c\u65f6\u95f4\u957f\u7684\u4ee3\u7801\u90e8\u5206\u3002<\/li>\n<li><strong>\u4f18\u5316\u7b97\u6cd5\uff1a<\/strong>\u4f7f\u7528\u66f4\u6709\u6548\u7684\u7b97\u6cd5\u6216\u6570\u636e\u7ed3\u6784\u6765\u964d\u4f4e\u65f6\u95f4\u590d\u6742\u5ea6\u3002<\/li>\n<li><strong>\u7f13\u5b58\uff1a<\/strong>\u7f13\u5b58\u6602\u8d35\u7684\u8ba1\u7b97\u6216\u5916\u90e8\u6570\u636e\uff0c\u4ee5\u51cf\u5c11\u91cd\u590d\u64cd\u4f5c\u7684\u5f00\u9500\u3002<\/li>\n<\/ul>\n<p><strong>3. \u8fc7\u5ea6\u540c\u6b65<\/strong><\/p>\n<p>\u4e0d\u5fc5\u8981\u7684\u540c\u6b65\u4f1a\u963b\u585e\u7ebf\u7a0b\u5e76\u5bfc\u81f4\u6267\u884c\u6548\u7387\u4f4e\u3002\u53ea\u6709\u5f53\u771f\u6b63\u9700\u8981\u4fdd\u6301\u6570\u636e\u4e00\u81f4\u6027\u65f6\u624d\u5e94\u8be5\u4f7f\u7528\u540c\u6b65\u3002\u4e3a\u4e86\u4f18\u5316\u540c\u6b65\uff0c\u8bf7\uff1a<\/p>\n<ul>\n<li>\u4ec5\u9501\u5b9a\u5fc5\u9700\u7684\u90e8\u5206\u4ee3\u7801\u3002<\/li>\n<li>\u4f7f\u7528\u8bfb\u5199\u9501\u5141\u8bb8\u5e76\u53d1\u8bfb\u53d6\u548c\u5199\u5165\u3002<\/li>\n<li>\u8003\u8651\u4f7f\u7528\u65e0\u9501\u6570\u636e\u7ed3\u6784\uff08\u5982 <code>ConcurrentHashMap<\/code>\uff09\u3002<\/li>\n<\/ul>\n<p><strong>4. \u5783\u573e\u56de\u6536\u5f00\u9500<\/strong><\/p>\n<p>\u5783\u573e\u56de\u6536\uff08GC\uff09\u8fc7\u7a0b\u53ef\u80fd\u4f1a\u5f71\u54cd\u51fd\u6570\u7684\u6267\u884c\u65f6\u95f4\uff0c\u5c24\u5176\u662f\u5f53 GC \u8fd0\u884c\u9891\u7e41\u6216\u5e94\u7528\u7a0b\u5e8f\u521b\u5efa\u5927\u91cf\u77ed\u671f\u5bf9\u8c61\u65f6\u3002\u4e3a\u4e86\u51cf\u8f7b GC \u5f00\u9500\uff0c\u53ef\u4ee5\uff1a<\/p>\n<ul>\n<li><strong>\u51cf\u5c11\u5bf9\u8c61\u521b\u5efa\uff1a<\/strong>\u4ec5\u521b\u5efa\u5fc5\u8981\u7684\u5bf9\u8c61\uff0c\u5e76\u4f7f\u7528\u5bf9\u8c61\u6c60\u6765\u91cd\u7528\u5bf9\u8c61\u3002<\/li>\n<li><strong>\u8c03\u4f18 GC\uff1a<\/strong>\u8c03\u6574 GC \u53c2\u6570\uff08\u5982\u6536\u96c6\u9891\u7387\u548c\u5783\u573e\u56de\u6536\u5668\u7c7b\u578b\uff09\u4ee5\u4f18\u5316\u6027\u80fd\u3002<\/li>\n<\/ul>\n<p><strong>\u5b9e\u6218\u6848\u4f8b\uff1a<\/strong><\/p>\n<p>\u8003\u8651\u4e0b\u9762\u7684 Java \u51fd\u6570\uff0c\u7528\u4e8e\u5728\u4e00\u4e2a\u5927\u5217\u8868\u4e2d\u67e5\u627e\u4e00\u4e2a\u7279\u5b9a\u5143\u7d20\u3002<\/p>\n<pre>public static int findElement(List&lt;Integer&gt; list, int element) {\n    for (int i = 0; i &lt; list.size(); i++) {\n        if (list.get(i) == element) {\n            return i;\n        }\n    }\n    return -1;\n}<\/pre>\n<p>\u901a\u8fc7\u5206\u6790\u4ee3\u7801\uff0c\u6211\u4eec\u53ef\u4ee5\u53d1\u73b0\u6027\u80fd\u74f6\u9888\u5728\u4e8e\u4f7f\u7528\u7ebf\u6027\u641c\u7d22\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528\u4e8c\u5206\u641c\u7d22\u7b97\u6cd5\u6765\u4f18\u5316\u8be5\u51fd\u6570\uff1a<\/p>\n<pre>public static int findElement(List&lt;Integer&gt; list, int element) {\n    int low = 0;\n    int high = list.size() - 1;\n    while (low &lt;= high) {\n        int mid = (low + high) \/ 2;\n        if (list.get(mid) == element) {\n            return mid;\n        } else if (list.get(mid) &lt; element) {\n            low = mid + 1;\n        } else {\n            high = mid - 1;\n        }\n    }\n    return -1;\n}<\/pre>\n<p>\u901a\u8fc7\u4f7f\u7528\u4e8c\u5206\u641c\u7d22\uff0c\u6211\u4eec\u5927\u5927\u964d\u4f4e\u4e86\u67e5\u627e\u5143\u7d20\u6240\u9700\u7684\u6bd4\u8f83\u6b21\u6570\uff0c\u4ece\u800c\u63d0\u9ad8\u4e86\u51fd\u6570\u7684\u6267\u884c\u6548\u7387\u3002<\/p>\n<p>\u6587\u4e2d\u5173\u4e8ejava,\u6267\u884c\u6548\u7387\u7684\u77e5\u8bc6\u4ecb\u7ecd\uff0c\u5e0c\u671b\u5bf9\u4f60\u7684\u5b66\u4e60\u6709\u6240\u5e2e\u52a9\uff01\u82e5\u662f\u53d7\u76ca\u532a\u6d45\uff0c\u90a3\u5c31\u52a8\u52a8\u9f20\u6807\u6536\u85cf\u8fd9\u7bc7\u300aJava \u51fd\u6570\u6267\u884c\u6548\u7387\u4f4e\u7684\u539f\u56e0\u662f\u4ec0\u4e48\uff1f\u300b\u6587\u7ae0\u5427\uff0c\u4e5f\u53ef\u5173\u6ce8\u516c\u4f17\u53f7\u4e86\u89e3\u76f8\u5173\u6280\u672f\u6587\u7ae0\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java \u51fd\u6570\u6267\u884c\u6548\u7387\u4f4e\u7684\u539f\u56e0\u662f&#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-202612","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202612","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=202612"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202612\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202612"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202612"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202612"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}