{"id":3054,"date":"2024-03-28T14:30:39","date_gmt":"2024-03-28T06:30:39","guid":{"rendered":"https:\/\/www.talktop.cn\/?p=3054"},"modified":"2024-12-16T11:12:11","modified_gmt":"2024-12-16T03:12:11","slug":"java-atomicinteger%e7%b1%bb%e7%9a%84%e4%bb%8b%e7%bb%8d%e4%b8%8e%e5%ba%94%e7%94%a8","status":"publish","type":"post","link":"https:\/\/www.talktop.cn\/?p=3054","title":{"rendered":"Java AtomicInteger \u7c7b\u7684\u4ecb\u7ecd\u4e0e\u5e94\u7528"},"content":{"rendered":"\n<p>\u5728 Java \u7f16\u7a0b\u4e2d\uff0c\u591a\u7ebf\u7a0b\u5e76\u53d1\u64cd\u4f5c\u662f\u4e00\u4e2a\u5e38\u89c1\u7684\u573a\u666f\uff0c\u800c\u5904\u7406\u591a\u7ebf\u7a0b\u5e76\u53d1\u64cd\u4f5c\u65f6\uff0c\u4fdd\u8bc1\u6570\u636e\u7684\u539f\u5b50\u6027\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002Java \u63d0\u4f9b\u4e86\u4e00\u7cfb\u5217\u539f\u5b50\u7c7b\uff08Atomic classes\uff09\u6765\u652f\u6301\u539f\u5b50\u64cd\u4f5c\uff0c\u5176\u4e2d <code>AtomicInteger<\/code> \u662f\u4e00\u4e2a\u5e38\u7528\u7684\u7c7b\uff0c\u7528\u4e8e\u5bf9\u6574\u578b\u53d8\u91cf\u8fdb\u884c\u539f\u5b50\u64cd\u4f5c\u3002<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">\u6838\u5fc3\u529f\u80fd<\/h5>\n\n\n\n<p><code>AtomicInteger<\/code> \u7c7b\u63d0\u4f9b\u4e86\u4e00\u79cd\u7ebf\u7a0b\u5b89\u5168\u7684\u65b9\u5f0f\u6765\u5bf9\u6574\u578b\u53d8\u91cf\u8fdb\u884c\u64cd\u4f5c\uff0c\u5b83\u5305\u542b\u4e86\u4e00\u7cfb\u5217\u539f\u5b50\u64cd\u4f5c\uff0c\u5982\u589e\u52a0\uff08increment\uff09\u3001\u51cf\u5c11\uff08decrement\uff09\u3001\u4ee5\u53ca\u83b7\u53d6\u5f53\u524d\u503c\u7b49\u3002\u8fd9\u4e9b\u64cd\u4f5c\u90fd\u662f\u539f\u5b50\u6027\u7684\uff0c\u4e0d\u9700\u8981\u989d\u5916\u7684\u540c\u6b65\u63aa\u65bd\u5c31\u53ef\u4ee5\u4fdd\u8bc1\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u7684\u6570\u636e\u5b89\u5168\u6027\u3002<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">\u7c7b\u7ee7\u627f\u5173\u7cfb<\/h5>\n\n\n\n<p><code>AtomicInteger<\/code> \u7c7b\u4f4d\u4e8e <code>java.util.concurrent.atomic<\/code> \u5305\u4e0b\uff0c\u662f <code>Number<\/code> \u7c7b\u7684\u5b50\u7c7b\uff0c\u540c\u65f6\u4e5f\u5b9e\u73b0\u4e86 <code>Serializable<\/code> \u63a5\u53e3\uff0c\u56e0\u6b64\u53ef\u4ee5\u88ab\u5e8f\u5217\u5316\u3002<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">\u5b9e\u73b0\u539f\u7406<\/h5>\n\n\n\n<p><code>AtomicInteger<\/code> \u7684\u5b9e\u73b0\u57fa\u4e8e CAS\uff08Compare And Swap\uff09\u64cd\u4f5c\uff0c\u8fd9\u662f\u4e00\u79cd\u4e50\u89c2\u9501\u7684\u5b9e\u73b0\u65b9\u5f0f\u3002\u7b80\u5355\u6765\u8bf4\uff0cCAS \u64cd\u4f5c\u5305\u542b\u4e09\u4e2a\u53c2\u6570\uff1a\u9700\u8981\u64cd\u4f5c\u7684\u5185\u5b58\u4f4d\u7f6e\u3001\u671f\u671b\u7684\u65e7\u503c\u4ee5\u53ca\u65b0\u503c\u3002\u5f53\u4e14\u4ec5\u5f53\u5f53\u524d\u5185\u5b58\u4f4d\u7f6e\u7684\u503c\u4e0e\u671f\u671b\u7684\u65e7\u503c\u76f8\u7b49\u65f6\uff0c\u624d\u4f1a\u5c06\u65b0\u503c\u5199\u5165\u5185\u5b58\uff0c\u5e76\u8fd4\u56de true\uff0c\u5426\u5219\u8fd4\u56de false\u3002\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0c\u53ef\u4ee5\u5b9e\u73b0\u7ebf\u7a0b\u5b89\u5168\u7684\u539f\u5b50\u64cd\u4f5c\u3002<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">\u793a\u4f8b<\/h5>\n\n\n\n<p>\u4e0b\u9762\u662f <code>AtomicInteger<\/code> \u7684\u4e24\u4e2a\u5177\u4f53\u5e94\u7528\u573a\u666f\u793a\u4f8b\uff1a<\/p>\n\n\n\n<p>1. \u8ba1\u6570\u5668<\/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-f44894f7736a20a385b1bdad231d43a4\"><code>import java.util.concurrent.atomic.AtomicInteger;\n\npublic class Counter {\n    private AtomicInteger count = new AtomicInteger(0);\n\n    public void increment() {\n        count.incrementAndGet();\n    }\n\n    public void decrement() {\n        count.decrementAndGet();\n    }\n\n    public int getCount() {\n        return count.get();\n    }\n}<\/code><\/pre>\n\n\n\n<p>\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u521b\u5efa\u4e86\u4e00\u4e2a\u8ba1\u6570\u5668\u7c7b <code>Counter<\/code>\uff0c\u5185\u90e8\u4f7f\u7528 <code>AtomicInteger<\/code> \u6765\u5b9e\u73b0\u8ba1\u6570\u529f\u80fd\u3002<code>increment()<\/code> \u65b9\u6cd5\u7528\u4e8e\u589e\u52a0\u8ba1\u6570\u5668\u7684\u503c\uff0c<code>decrement()<\/code> \u65b9\u6cd5\u7528\u4e8e\u51cf\u5c11\u8ba1\u6570\u5668\u7684\u503c\uff0c<code>getCount()<\/code> \u65b9\u6cd5\u7528\u4e8e\u83b7\u53d6\u5f53\u524d\u8ba1\u6570\u5668\u7684\u503c\u3002\u7531\u4e8e <code>AtomicInteger<\/code> \u7684\u539f\u5b50\u6027\u64cd\u4f5c\uff0c\u8fd9\u4e9b\u65b9\u6cd5\u90fd\u53ef\u4ee5\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u5b89\u5168\u5730\u4f7f\u7528\u3002<\/p>\n\n\n\n<p>2. \u7ebf\u7a0b\u6c60\u4efb\u52a1\u8ba1\u6570<\/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-35328319f9c8996d5ec46e17a218f26c\"><code>import java.util.concurrent.ExecutorService;\nimport java.util.concurrent.Executors;\nimport java.util.concurrent.atomic.AtomicInteger;\n\npublic class ThreadPoolTaskCounter {\n    private AtomicInteger count = new AtomicInteger(0);\n\n    public void taskStarted() {\n        count.incrementAndGet();\n    }\n\n    public void taskFinished() {\n        count.decrementAndGet();\n    }\n\n    public int getActiveTaskCount() {\n        return count.get();\n    }\n\n    public static void main(String&#91;] args) {\n        ThreadPoolTaskCounter counter = new ThreadPoolTaskCounter();\n        ExecutorService executorService = Executors.newFixedThreadPool(5);\n\n        for (int i = 0; i &lt; 10; i++) {\n            executorService.submit(() -&gt; {\n                counter.taskStarted();\n                try {\n                    \/\/ \u6a21\u62df\u4efb\u52a1\u6267\u884c\n                    Thread.sleep(1000);\n                } catch (InterruptedException e) {\n                    e.printStackTrace();\n                } finally {\n                    counter.taskFinished();\n                }\n            });\n        }\n\n        executorService.shutdown();\n        \/\/ \u7b49\u5f85\u6240\u6709\u4efb\u52a1\u6267\u884c\u5b8c\u6bd5\n        while (!executorService.isTerminated()) {}\n\n        System.out.println(\"Active tasks: \" + counter.getActiveTaskCount());\n    }\n}<\/code><\/pre>\n\n\n\n<p>\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u521b\u5efa\u4e86\u4e00\u4e2a\u7528\u4e8e\u7edf\u8ba1\u7ebf\u7a0b\u6c60\u4e2d\u6d3b\u8dc3\u4efb\u52a1\u6570\u91cf\u7684\u7c7b <code>ThreadPoolTaskCounter<\/code>\u3002\u901a\u8fc7\u5728\u4efb\u52a1\u5f00\u59cb\u548c\u7ed3\u675f\u65f6\u8c03\u7528 <code>taskStarted()<\/code> \u548c <code>taskFinished()<\/code> \u65b9\u6cd5\uff0c\u53ef\u4ee5\u52a8\u6001\u5730\u66f4\u65b0\u6d3b\u8dc3\u4efb\u52a1\u6570\u91cf\u3002\u6700\u540e\uff0c\u901a\u8fc7 <code>getActiveTaskCount()<\/code> \u65b9\u6cd5\u83b7\u53d6\u5f53\u524d\u6d3b\u8dc3\u4efb\u52a1\u6570\u91cf\u3002<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">\u6ce8\u610f\u4e8b\u9879<\/h5>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5c3d\u7ba1 <code>AtomicInteger<\/code> \u63d0\u4f9b\u4e86\u7ebf\u7a0b\u5b89\u5168\u7684\u539f\u5b50\u64cd\u4f5c\uff0c\u4f46\u5728\u4e00\u4e9b\u7279\u5b9a\u573a\u666f\u4e0b\u4ecd\u7136\u9700\u8981\u989d\u5916\u7684\u540c\u6b65\u63aa\u65bd\u6765\u4fdd\u8bc1\u6570\u636e\u7684\u4e00\u81f4\u6027\u3002<\/li>\n\n\n\n<li>\u5c3d\u91cf\u907f\u514d\u8fc7\u591a\u7684\u539f\u5b50\u64cd\u4f5c\uff0c\u56e0\u4e3a\u539f\u5b50\u64cd\u4f5c\u7684\u5f00\u9500\u76f8\u5bf9\u8f83\u9ad8\uff0c\u53ef\u80fd\u4f1a\u5f71\u54cd\u7a0b\u5e8f\u7684\u6027\u80fd\u3002<\/li>\n\n\n\n<li>\u6ce8\u610f\u907f\u514d\u4f7f\u7528 <code>AtomicInteger<\/code> \u6765\u4ee3\u66ff <code>Integer<\/code>\uff0c\u56e0\u4e3a <code>AtomicInteger<\/code> \u662f\u4e3a\u4e86\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u7684\u539f\u5b50\u64cd\u4f5c\u800c\u8bbe\u8ba1\u7684\uff0c\u4f7f\u7528\u5b83\u4f1a\u589e\u52a0\u989d\u5916\u7684\u5f00\u9500\u3002<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 Java \u7f16\u7a0b\u4e2d\uff0c\u591a\u7ebf\u7a0b\u5e76\u53d1\u64cd\u4f5c\u662f\u4e00\u4e2a\u5e38\u89c1\u7684\u573a\u666f\uff0c\u800c\u5904\u7406\u591a\u7ebf\u7a0b\u5e76\u53d1\u64cd\u4f5c\u65f6\uff0c\u4fdd\u8bc1\u6570\u636e\u7684\u539f\u5b50\u6027\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002J [&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-3054","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\/ 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