{"id":3045,"date":"2024-03-28T14:00:25","date_gmt":"2024-03-28T06:00:25","guid":{"rendered":"https:\/\/www.talktop.cn\/?p=3045"},"modified":"2024-12-16T11:15:26","modified_gmt":"2024-12-16T03:15:26","slug":"%e6%b7%b1%e5%85%a5%e7%90%86%e8%a7%a3countdownlatch%e7%b1%bb","status":"publish","type":"post","link":"https:\/\/www.talktop.cn\/?p=3045","title":{"rendered":"\u6df1\u5165\u7406\u89e3Java CountDownLatch\u7c7b"},"content":{"rendered":"\n<p>\u4f5c\u4e3aJava\u5f00\u53d1\u4eba\u5458\uff0c\u6211\u4eec\u7ecf\u5e38\u4f1a\u9047\u5230\u9700\u8981\u534f\u8c03\u591a\u4e2a\u7ebf\u7a0b\u6267\u884c\u7684\u60c5\u51b5\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c<code>CountDownLatch<\/code> \u7c7b\u6210\u4e3a\u4e86\u4e00\u4e2a\u5f3a\u5927\u800c\u5b9e\u7528\u7684\u5de5\u5177\u3002\u672c\u6587\u5c06\u6df1\u5165\u63a2\u8ba8<code>CountDownLatch<\/code> \u7c7b\u7684\u6838\u5fc3\u529f\u80fd\u3001\u7c7b\u7ee7\u627f\u5173\u7cfb\u3001\u5b9e\u73b0\u539f\u7406\uff0c\u5e76\u901a\u8fc7\u5177\u4f53\u7684\u793a\u4f8b\u6765\u8bf4\u660e\u5176\u7528\u6cd5\uff0c\u540c\u65f6\u63d0\u4f9b\u6ce8\u610f\u4e8b\u9879\uff0c\u5e2e\u52a9\u65b0\u624bJava\u5f00\u53d1\u4eba\u5458\u66f4\u597d\u5730\u7406\u89e3\u548c\u4f7f\u7528\u8fd9\u4e00\u7c7b\u3002<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">CountDownLatch\u7684\u6838\u5fc3\u529f\u80fd<\/h5>\n\n\n\n<p><code>CountDownLatch<\/code> \u662fJava\u5e76\u53d1\u5305\uff08java.util.concurrent\uff09\u4e2d\u7684\u4e00\u4e2a\u7c7b\uff0c\u5176\u6838\u5fc3\u529f\u80fd\u662f\u5141\u8bb8\u4e00\u4e2a\u6216\u591a\u4e2a\u7ebf\u7a0b\u7b49\u5f85\u5176\u4ed6\u7ebf\u7a0b\u5b8c\u6210\u64cd\u4f5c\u3002\u5176\u4e3b\u8981\u65b9\u6cd5\u662f <code>await()<\/code> \u548c <code>countDown()<\/code>\u3002\u5f53\u4e00\u4e2a\u7ebf\u7a0b\u8c03\u7528 <code>await()<\/code> \u65b9\u6cd5\u65f6\uff0c\u5b83\u4f1a\u4e00\u76f4\u7b49\u5f85\uff0c\u76f4\u5230 <code>countDown()<\/code> \u65b9\u6cd5\u7684\u8ba1\u6570\u5668\u5f52\u96f6\u4e3a\u6b62\u3002<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">\u7c7b\u7ee7\u627f\u5173\u7cfb<\/h5>\n\n\n\n<p><code>CountDownLatch<\/code> \u7c7b\u5e76\u4e0d\u6d89\u53ca\u7ee7\u627f\uff0c\u5b83\u662f\u76f4\u63a5\u5b9e\u73b0\u7684\u3002\u5b83\u4f4d\u4e8e <code>java.util.concurrent<\/code> \u5305\u4e2d\uff0c\u662f\u8be5\u5305\u4e2d\u7684\u4e00\u4e2a\u91cd\u8981\u6210\u5458\u3002<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">\u5b9e\u73b0\u539f\u7406<\/h5>\n\n\n\n<p><code>CountDownLatch<\/code> \u7684\u5b9e\u73b0\u57fa\u4e8eAQS\uff08AbstractQueuedSynchronizer\uff09\u7c7b\uff0c\u5185\u90e8\u7ef4\u62a4\u4e86\u4e00\u4e2a\u8ba1\u6570\u5668\uff08count\uff09\uff0c\u521d\u59cb\u503c\u7531\u6784\u9020\u65b9\u6cd5\u6307\u5b9a\u3002<code>await()<\/code> \u65b9\u6cd5\u4f1a\u4f7f\u8c03\u7528\u7ebf\u7a0b\u963b\u585e\uff0c\u76f4\u5230\u8ba1\u6570\u5668\u53d8\u4e3a0\uff1b\u800c <code>countDown()<\/code> \u65b9\u6cd5\u4f1a\u5c06\u8ba1\u6570\u5668\u51cf1\u3002\u5f53\u8ba1\u6570\u5668\u5f52\u96f6\u65f6\uff0c\u6240\u6709\u7b49\u5f85\u7684\u7ebf\u7a0b\u90fd\u4f1a\u88ab\u91ca\u653e\u3002<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">\u793a\u4f8b\u8bf4\u660e<\/h5>\n\n\n\n<p>1. \u591a\u7ebf\u7a0b\u4efb\u52a1\u534f\u540c<\/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-18cc4c888178201e58555f6dbde6bb95\"><code>import java.util.concurrent.CountDownLatch;\n\npublic class TaskCoordinator {\n    public static void main(String&#91;] args) throws InterruptedException {\n        final CountDownLatch latch = new CountDownLatch(3);\n\n        Runnable task = () -&gt; {\n            System.out.println(\"Task is running...\");\n            latch.countDown(); \/\/ \u51cf\u5c11\u8ba1\u6570\u5668\n        };\n\n        \/\/ \u521b\u5efa\u5e76\u542f\u52a8\u4e09\u4e2a\u7ebf\u7a0b\u6267\u884c\u4efb\u52a1\n        for (int i = 0; i &lt; 3; i++) {\n            new Thread(task).start();\n        }\n\n        latch.await(); \/\/ \u7b49\u5f85\u6240\u6709\u4efb\u52a1\u5b8c\u6210\n        System.out.println(\"All tasks are completed.\");\n    }\n}<\/code><\/pre>\n\n\n\n<p>2. \u4e3b\u7ebf\u7a0b\u7b49\u5f85\u591a\u4e2a\u5b50\u7ebf\u7a0b\u5b8c\u6210<\/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-b9cb6ced238293666a9478fe3c0755fa\"><code>import java.util.concurrent.CountDownLatch;\n\npublic class MainThread {\n    public static void main(String&#91;] args) throws InterruptedException {\n        final CountDownLatch latch = new CountDownLatch(2);\n\n        \/\/ \u542f\u52a8\u4e24\u4e2a\u5b50\u7ebf\u7a0b\n        new Thread(() -&gt; {\n            System.out.println(\"Task 1 is running...\");\n            latch.countDown(); \/\/ \u51cf\u5c11\u8ba1\u6570\u5668\n        }).start();\n\n        new Thread(() -&gt; {\n            System.out.println(\"Task 2 is running...\");\n            latch.countDown(); \/\/ \u51cf\u5c11\u8ba1\u6570\u5668\n        }).start();\n\n        latch.await(); \/\/ \u4e3b\u7ebf\u7a0b\u7b49\u5f85\u4e24\u4e2a\u5b50\u7ebf\u7a0b\u5b8c\u6210\n        System.out.println(\"All tasks are completed.\");\n    }\n}<\/code><\/pre>\n\n\n\n<h5 class=\"wp-block-heading\">\u6ce8\u610f\u4e8b\u9879<\/h5>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u5728\u4f7f\u7528 <code>CountDownLatch<\/code> \u65f6\uff0c\u8981\u786e\u4fdd\u8c03\u7528 <code>countDown()<\/code> \u65b9\u6cd5\u7684\u6b21\u6570\u7b49\u4e8e\u6784\u9020\u65b9\u6cd5\u4e2d\u6307\u5b9a\u7684\u521d\u59cb\u503c\uff0c\u5426\u5219\u4f1a\u5bfc\u81f4 <code>await()<\/code> \u65b9\u6cd5\u6c38\u8fdc\u963b\u585e\u3002<\/li>\n\n\n\n<li>\u4f7f\u7528 <code>CountDownLatch<\/code> 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