{"id":3070,"date":"2024-03-29T16:01:39","date_gmt":"2024-03-29T08:01:39","guid":{"rendered":"https:\/\/www.talktop.cn\/?p=3070"},"modified":"2024-12-16T11:10:56","modified_gmt":"2024-12-16T03:10:56","slug":"java-concurrenthashmap%e8%af%a6%e8%a7%a3%ef%bc%9a%e5%b9%b6%e5%8f%91%e5%ae%89%e5%85%a8%e7%9a%84%e5%93%88%e5%b8%8c%e8%a1%a8","status":"publish","type":"post","link":"https:\/\/www.talktop.cn\/?p=3070","title":{"rendered":"Java ConcurrentHashMap\u8be6\u89e3\uff1a\u5e76\u53d1\u5b89\u5168\u7684\u54c8\u5e0c\u8868"},"content":{"rendered":"\n<p>\u5728Java\u5f00\u53d1\u4e2d\uff0c\u5904\u7406\u591a\u7ebf\u7a0b\u5e76\u53d1\u8bbf\u95ee\u6570\u636e\u65f6\uff0c\u7ecf\u5e38\u4f1a\u9047\u5230\u7ebf\u7a0b\u5b89\u5168\u7684\u95ee\u9898\u3002\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e9b\u95ee\u9898\uff0cJava\u63d0\u4f9b\u4e86\u8bb8\u591a\u5e76\u53d1\u5b89\u5168\u7684\u6570\u636e\u7ed3\u6784\uff0c\u5176\u4e2d\u4e4b\u4e00\u5c31\u662fConcurrentHashMap\u3002\u672c\u6587\u5c06\u6df1\u5165\u4ecb\u7ecdConcurrentHashMap\u7684\u6838\u5fc3\u529f\u80fd\u3001\u7c7b\u7ee7\u627f\u5173\u7cfb\u3001\u5b9e\u73b0\u539f\u7406\uff0c\u5e76\u901a\u8fc7\u5177\u4f53\u793a\u4f8b\u8bf4\u660e\u5176\u7528\u6cd5\u548c\u5e94\u7528\u573a\u666f\uff0c\u540c\u65f6\u63d0\u4f9b\u4e00\u4e9b\u6ce8\u610f\u4e8b\u9879\uff0c\u5e2e\u52a9\u65b0\u624bJava\u5f00\u53d1\u4eba\u5458\u66f4\u597d\u5730\u7406\u89e3\u548c\u4f7f\u7528\u8be5\u7c7b\u3002<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">\u4e00\u3001ConcurrentHashMap\u7684\u6838\u5fc3\u529f\u80fd<\/h5>\n\n\n\n<p>ConcurrentHashMap\u662fJava\u96c6\u5408\u6846\u67b6\u4e2d\u7684\u4e00\u5458\uff0c\u5b83\u63d0\u4f9b\u4e86\u4e00\u4e2a\u5e76\u53d1\u5b89\u5168\u7684\u54c8\u5e0c\u8868\u5b9e\u73b0\u3002\u4e0eHashMap\u76f8\u6bd4\uff0cConcurrentHashMap\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u66f4\u52a0\u5b89\u5168\u548c\u9ad8\u6548\u3002\u5176\u4e3b\u8981\u529f\u80fd\u5305\u62ec\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u5e76\u53d1\u5b89\u5168\u6027\uff1a<\/strong> ConcurrentHashMap\u80fd\u591f\u652f\u6301\u591a\u7ebf\u7a0b\u5e76\u53d1\u8bbf\u95ee\uff0c\u800c\u65e0\u9700\u663e\u5f0f\u52a0\u9501\u3002\u5b83\u901a\u8fc7\u5185\u90e8\u5b9e\u73b0\u673a\u5236\u6765\u786e\u4fdd\u7ebf\u7a0b\u5b89\u5168\uff0c\u4ece\u800c\u907f\u514d\u4e86\u6570\u636e\u7ade\u4e89\u548c\u4e0d\u4e00\u81f4\u6027\u95ee\u9898\u3002<\/li>\n\n\n\n<li><strong>\u9ad8\u6548\u6027\u80fd\uff1a<\/strong> ConcurrentHashMap\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u80fd\u591f\u63d0\u4f9b\u8f83\u9ad8\u7684\u5e76\u53d1\u6027\u80fd\u3002\u76f8\u6bd4\u4e8e\u4f20\u7edf\u7684\u540c\u6b65Map\uff08\u5982Hashtable\u6216\u901a\u8fc7Collections.synchronizedMap\u5305\u88c5\u7684Map\uff09\uff0cConcurrentHashMap\u5728\u4e00\u5b9a\u7a0b\u5ea6\u4e0a\u51cf\u5c11\u4e86\u9501\u7ade\u4e89\uff0c\u4ece\u800c\u63d0\u5347\u4e86\u6027\u80fd\u3002<\/li>\n\n\n\n<li><strong>\u53ef\u4f38\u7f29\u6027\uff1a<\/strong> ConcurrentHashMap\u652f\u6301\u52a8\u6001\u8c03\u6574\u5bb9\u91cf\uff0c\u80fd\u591f\u5728\u4e0d\u5f71\u54cd\u6574\u4f53\u6027\u80fd\u7684\u60c5\u51b5\u4e0b\u8fdb\u884c\u5e76\u53d1\u63d2\u5165\u3001\u5220\u9664\u548c\u67e5\u8be2\u64cd\u4f5c\u3002<\/li>\n<\/ol>\n\n\n\n<h6 class=\"wp-block-heading\">\u7c7b\u7ee7\u627f\u5173\u7cfb<\/h6>\n\n\n\n<p>ConcurrentHashMap\u7c7b\u7684\u7ee7\u627f\u5173\u7cfb\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code has-white-color has-black-background-color has-text-color has-background has-link-color wp-elements-d04d52c738c321fe7048468bd733273b\"><code>java.lang.Object\n  \u21b3 java.util.AbstractMap&lt;K,V&gt;\n      \u21b3 java.util.concurrent.ConcurrentHashMap&lt;K,V&gt;<\/code><\/pre>\n\n\n\n<p>ConcurrentHashMap\u76f4\u63a5\u7ee7\u627f\u81eaAbstractMap\u7c7b\uff0c\u5b9e\u73b0\u4e86Map\u63a5\u53e3\uff0c\u540c\u65f6\u4e5f\u662f\u4e00\u4e2a\u7ebf\u7a0b\u5b89\u5168\u7684Map\u5b9e\u73b0\u3002<\/p>\n\n\n\n<h6 class=\"wp-block-heading\">\u5b9e\u73b0\u539f\u7406<\/h6>\n\n\n\n<p>ConcurrentHashMap\u7684\u5b9e\u73b0\u539f\u7406\u4e3b\u8981\u57fa\u4e8e\u5206\u6bb5\u9501\uff08Segment\uff09\u548cCAS\uff08Compare and Swap\uff09\u64cd\u4f5c\u3002\u5b83\u5c06\u6574\u4e2a\u6570\u636e\u7ed3\u6784\u5206\u6210\u591a\u4e2a\u6bb5\uff08Segment\uff09\uff0c\u6bcf\u4e2a\u6bb5\u90fd\u662f\u4e00\u4e2a\u72ec\u7acb\u7684\u54c8\u5e0c\u8868\uff0c\u5404\u81ea\u7ba1\u7406\u7740\u4e00\u90e8\u5206\u952e\u503c\u5bf9\u3002\u6bcf\u4e2a\u6bb5\u5185\u90e8\u91c7\u7528\u6570\u7ec4+\u94fe\u8868\/\u7ea2\u9ed1\u6811\u7684\u65b9\u5f0f\u5b58\u50a8\u6570\u636e\uff0c\u901a\u8fc7\u54c8\u5e0c\u7b97\u6cd5\u786e\u5b9a\u952e\u503c\u5bf9\u5e94\u7684\u5b58\u50a8\u4f4d\u7f6e\u3002<\/p>\n\n\n\n<p>\u5728\u8bfb\u64cd\u4f5c\u65f6\uff0cConcurrentHashMap\u5141\u8bb8\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u8bbf\u95ee\u4e0d\u540c\u7684\u6bb5\uff0c\u4ece\u800c\u5b9e\u73b0\u4e86\u8bfb\u64cd\u4f5c\u7684\u5e76\u53d1\u6027\u3002\u800c\u5728\u5199\u64cd\u4f5c\u65f6\uff0cConcurrentHashMap\u4f1a\u5148\u9501\u5b9a\u6d89\u53ca\u5230\u7684\u6bb5\uff0c\u7136\u540e\u6267\u884c\u5177\u4f53\u7684\u63d2\u5165\u3001\u5220\u9664\u6216\u66f4\u65b0\u64cd\u4f5c\uff0c\u6700\u540e\u91ca\u653e\u9501\u3002\u8fd9\u6837\u505a\u7684\u597d\u5904\u662f\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\u53ef\u4ee5\u907f\u514d\u9501\u7ade\u4e89\uff0c\u63d0\u9ad8\u4e86\u5e76\u53d1\u6027\u80fd\u3002<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">\u4e8c\u3001\u793a\u4f8b\u5e94\u7528\u573a\u666f<\/h5>\n\n\n\n<p><strong>1.\u9ad8\u5e76\u53d1\u7f13\u5b58<\/strong><br>\u5728\u9ad8\u5e76\u53d1\u7684\u7f51\u7edc\u5e94\u7528\u4e2d\uff0c\u901a\u5e38\u9700\u8981\u4f7f\u7528\u7f13\u5b58\u6765\u63d0\u9ad8\u6570\u636e\u8bbf\u95ee\u6027\u80fd\u3002ConcurrentHashMap\u53ef\u4ee5\u4f5c\u4e3a\u4e00\u4e2a\u9ad8\u6548\u7684\u7f13\u5b58\u5bb9\u5668\uff0c\u7528\u4e8e\u5b58\u50a8\u9891\u7e41\u8bbf\u95ee\u7684\u6570\u636e\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u6570\u636e\u5e93\u67e5\u8be2\u7ed3\u679c\u7f13\u5b58\u5728ConcurrentHashMap\u4e2d\uff0c\u591a\u4e2a\u7ebf\u7a0b\u53ef\u4ee5\u5e76\u53d1\u5730\u4ece\u7f13\u5b58\u4e2d\u8bfb\u53d6\u6570\u636e\uff0c\u907f\u514d\u4e86\u9891\u7e41\u7684\u6570\u636e\u5e93\u8bbf\u95ee\uff0c\u63d0\u5347\u4e86\u7cfb\u7edf\u7684\u54cd\u5e94\u901f\u5ea6\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code has-white-color has-black-background-color has-text-color has-background has-link-color wp-elements-d4734f3a94c742c639e5935470e3070e\"><code>ConcurrentHashMap&lt;String, Object&gt; cache = new ConcurrentHashMap&lt;&gt;();\n\n\/\/ \u5c06\u6570\u636e\u5e93\u67e5\u8be2\u7ed3\u679c\u7f13\u5b58\nString key = \"query_result\";\nObject value = fetchDataFromDatabase();\ncache.put(key, value);\n\n\/\/ \u4ece\u7f13\u5b58\u4e2d\u83b7\u53d6\u6570\u636e\nObject data = cache.get(key);<\/code><\/pre>\n\n\n\n<p><strong>2.\u4efb\u52a1\u5206\u53d1\u4e0e\u7ed3\u679c\u6536\u96c6<\/strong><br>\u5728\u5e76\u884c\u8ba1\u7b97\u6216\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\uff0c\u7ecf\u5e38\u9700\u8981\u5c06\u4efb\u52a1\u5206\u53d1\u7ed9\u591a\u4e2a\u5de5\u4f5c\u7ebf\u7a0b\uff0c\u5e76\u6536\u96c6\u5b83\u4eec\u7684\u6267\u884c\u7ed3\u679c\u3002ConcurrentHashMap\u53ef\u4ee5\u4f5c\u4e3a\u4efb\u52a1\u4e0e\u7ed3\u679c\u7684\u6620\u5c04\u5bb9\u5668\uff0c\u591a\u4e2a\u7ebf\u7a0b\u53ef\u4ee5\u5e76\u53d1\u5730\u5411\u5176\u4e2d\u6dfb\u52a0\u4efb\u52a1\u548c\u7ed3\u679c\uff0c\u4ece\u800c\u5b9e\u73b0\u9ad8\u6548\u7684\u4efb\u52a1\u5206\u53d1\u4e0e\u7ed3\u679c\u6536\u96c6\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code has-white-color has-black-background-color has-text-color has-background has-link-color wp-elements-db1d3e8d7ea5398f339b37eaec593775\"><code>ConcurrentHashMap&lt;Integer, String&gt; taskResultMap = new ConcurrentHashMap&lt;&gt;();\n\n\/\/ \u5e76\u53d1\u6267\u884c\u4efb\u52a1\uff0c\u5e76\u5c06\u7ed3\u679c\u5b58\u50a8\u5728ConcurrentHashMap\u4e2d\nExecutorService executor = Executors.newFixedThreadPool(10);\nfor (int i = 0; i &lt; 10; i++) {\n    final int taskId = i;\n    executor.execute(() -&gt; {\n        String result = doTask(taskId);\n        taskResultMap.put(taskId, result);\n    });\n}\nexecutor.shutdown();\nexecutor.awaitTermination(Long.MAX_VALUE, TimeUnit.SECONDS);\n\n\/\/ \u6536\u96c6\u4efb\u52a1\u6267\u884c\u7ed3\u679c\nfor (Map.Entry&lt;Integer, String&gt; entry : taskResultMap.entrySet()) {\n    System.out.println(\"Task \" + entry.getKey() + \" result: \" + entry.getValue());\n}<\/code><\/pre>\n\n\n\n<h5 class=\"wp-block-heading\">\u4e09\u3001\u6ce8\u610f\u4e8b\u9879<\/h5>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u8fed\u4ee3\u5668\u5b89\u5168\u6027\uff1a<\/strong> \u5c3d\u7ba1ConcurrentHashMap\u652f\u6301\u5e76\u53d1\u8bbf\u95ee\uff0c\u4f46\u5728\u4f7f\u7528\u8fed\u4ee3\u5668\u904d\u5386\u65f6\uff0c\u4ecd\u7136\u9700\u8981\u6ce8\u610f\u5e76\u53d1\u4fee\u6539\u7684\u95ee\u9898\u3002\u5982\u679c\u5728\u8fed\u4ee3\u8fc7\u7a0b\u4e2d\u5bf9ConcurrentHashMap\u8fdb\u884c\u4e86\u4fee\u6539\uff08\u5982\u63d2\u5165\u3001\u5220\u9664\u64cd\u4f5c\uff09\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4ConcurrentModificationException\u5f02\u5e38\u3002\u4e3a\u4e86\u907f\u514d\u8fd9\u79cd\u60c5\u51b5\uff0c\u53ef\u4ee5\u8003\u8651\u4f7f\u7528ConcurrentHashMap\u63d0\u4f9b\u7684\u7ebf\u7a0b\u5b89\u5168\u7684\u904d\u5386\u65b9\u6cd5\uff08\u5982forEach\uff09\u6216\u8005\u5728\u8fed\u4ee3\u65f6\u4f7f\u7528\u540c\u6b65\u63aa\u65bd\u3002<\/li>\n\n\n\n<li><strong>\u9002\u7528\u573a\u666f\u9009\u62e9\uff1a<\/strong> \u867d\u7136ConcurrentHashMap\u80fd\u591f\u63d0\u4f9b\u8f83\u597d\u7684\u5e76\u53d1\u6027\u80fd\uff0c\u4f46\u5e76\u4e0d\u662f\u9002\u7528\u4e8e\u6240\u6709\u573a\u666f\u3002\u5728\u5355\u7ebf\u7a0b\u6216\u4f4e\u5e76\u53d1\u73af\u5883\u4e0b\uff0c\u4f7f\u7528HashMap\u53ef\u80fd\u66f4\u4e3a\u7b80\u5355\u9ad8\u6548\u3002\u56e0\u6b64\uff0c\u5728\u9009\u62e9\u6570\u636e\u7ed3\u6784\u65f6\uff0c\u9700\u8981\u6839\u636e\u5177\u4f53\u7684\u5e94\u7528\u573a\u666f\u548c\u6027\u80fd\u8981\u6c42\u6765\u8fdb\u884c\u6743\u8861\u548c\u9009\u62e9\u3002<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>\u5728Java\u5f00\u53d1\u4e2d\uff0c\u5904\u7406\u591a\u7ebf\u7a0b\u5e76\u53d1\u8bbf\u95ee\u6570\u636e\u65f6\uff0c\u7ecf\u5e38\u4f1a\u9047\u5230\u7ebf\u7a0b\u5b89\u5168\u7684\u95ee\u9898\u3002\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e9b\u95ee\u9898\uff0cJava\u63d0\u4f9b\u4e86\u8bb8\u591a\u5e76\u53d1 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[59],"tags":[16],"class_list":["post-3070","post","type-post","status-publish","format-standard","hentry","category-59","tag-java"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Java ConcurrentHashMap\u8be6\u89e3\uff1a\u5e76\u53d1\u5b89\u5168\u7684\u54c8\u5e0c\u8868<\/title>\n<meta name=\"description\" content=\"\u672c\u6587\u5c06\u6df1\u5165\u4ecb\u7ecdConcurrentHashMap\u7684\u6838\u5fc3\u529f\u80fd\u3001\u7c7b\u7ee7\u627f\u5173\u7cfb\u3001\u5b9e\u73b0\u539f\u7406\uff0c\u5e76\u901a\u8fc7\u5177\u4f53\u793a\u4f8b\u8bf4\u660e\u5176\u7528\u6cd5\u548c\u5e94\u7528\u573a\u666f\uff0c\u540c\u65f6\u63d0\u4f9b\u4e00\u4e9b\u6ce8\u610f\u4e8b\u9879\uff0c\u5e2e\u52a9\u65b0\u624bJava\u5f00\u53d1\u4eba\u5458\u66f4\u597d\u5730\u7406\u89e3\u548c\u4f7f\u7528\u8be5\u7c7b\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.talktop.cn\/?p=3070\" \/>\n<script type=\"application\/ld+json\" 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