{"id":202518,"date":"2025-05-22T10:41:42","date_gmt":"2025-05-22T02:41:42","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202518\/"},"modified":"2025-05-22T10:41:42","modified_gmt":"2025-05-22T02:41:42","slug":"java-%e5%87%bd%e6%95%b0%e5%92%8c%e6%96%b9%e6%b3%95%e5%9c%a8%e5%b9%b6%e5%8f%91%e7%bc%96%e7%a8%8b%e4%b8%ad%e7%9a%84%e5%ba%94%e7%94%a8%e6%98%af%e4%bb%80%e4%b9%88%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202518\/","title":{"rendered":"Java \u51fd\u6570\u548c\u65b9\u6cd5\u5728\u5e76\u53d1\u7f16\u7a0b\u4e2d\u7684\u5e94\u7528\u662f\u4ec0\u4e48\uff1f"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>Java \u51fd\u6570\u548c\u65b9\u6cd5\u5728\u5e76\u53d1\u7f16\u7a0b\u4e2d\u7684\u5e94\u7528\u662f\u4ec0\u4e48\uff1f<\/h1>\n<p>\u4eb2\u7231\u7684\u7f16\u7a0b\u5b66\u4e60\u7231\u597d\u8005\uff0c\u5982\u679c\u4f60\u70b9\u5f00\u4e86\u8fd9\u7bc7\u6587\u7ae0\uff0c\u8bf4\u660e\u4f60\u5bf9\u300aJava \u51fd\u6570\u548c\u65b9\u6cd5\u5728\u5e76\u53d1\u7f16\u7a0b\u4e2d\u7684\u5e94\u7528\u662f\u4ec0\u4e48\uff1f\u300b\u5f88\u611f\u5174\u8da3\u3002\u672c\u7bc7\u6587\u7ae0\u5c31\u6765\u7ed9\u5927\u5bb6\u8be6\u7ec6\u89e3\u6790\u4e00\u4e0b\uff0c\u4e3b\u8981\u4ecb\u7ecd\u4e00\u4e0b\uff0c\u5e0c\u671b\u6240\u6709\u8ba4\u771f\u8bfb\u5b8c\u7684\u7ae5\u978b\u4eec\uff0c\u90fd\u6709\u5b9e\u8d28\u6027\u7684\u63d0\u9ad8\u3002<\/p>\n<p>\u5728 Java \u5e76\u53d1\u7f16\u7a0b\u4e2d\uff0c\u51fd\u6570\u53ef\u7528\u4f5c\u8f7b\u91cf\u7ea7\u540c\u6b65\u673a\u5236\uff0c\u53ef\u5b89\u5168\u5171\u4eab\u6570\u636e\uff0c\u800c\u65b9\u6cd5\u53ef\u5b9e\u73b0\u66f4\u590d\u6742\u7684\u5e76\u53d1\u539f\u8bed\uff0c\u5982\u4e92\u65a5\u9501\u548c\u6761\u4ef6\u53d8\u91cf\u3002\u793a\u4f8b\u5305\u62ec\u5bf9\u5171\u4eab\u53d8\u91cf\u8fdb\u884c\u539f\u5b50\u66f4\u65b0\u7684\u51fd\u6570\u548c\u4f7f\u7528 synchronized \u5173\u952e\u5b57\u5b9e\u73b0\u4e92\u65a5\u9501\u7684\u65b9\u6cd5\u3002\u8fd9\u4e9b\u673a\u5236\u63d0\u9ad8\u4e86\u5e76\u53d1\u4ee3\u7801\u7684\u6027\u80fd\u548c\u53ef\u7ef4\u62a4\u6027\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241026\/1729913502671c629e16d67.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>Java \u51fd\u6570\u548c\u65b9\u6cd5\u5728\u5e76\u53d1\u7f16\u7a0b\u4e2d\u7684\u5e94\u7528<\/strong><\/p>\n<p>\u5728 Java \u4e2d\uff0c\u51fd\u6570\u548c\u65b9\u6cd5\u662f\u6267\u884c\u7279\u5b9a\u4efb\u52a1\u7684\u4ee3\u7801\u5757\u3002\u5b83\u4eec\u4e4b\u95f4\u7684\u4e3b\u8981\u533a\u522b\u5728\u4e8e\u51fd\u6570\u53ef\u4ee5\u63a5\u53d7\u53c2\u6570\u5e76\u8fd4\u56de\u4e00\u4e2a\u503c\uff0c\u800c\u65b9\u6cd5\u6ca1\u6709\u8fd4\u56de\u7c7b\u578b\u3002\u5728\u5e76\u53d1\u7f16\u7a0b\u4e2d\uff0c\u51fd\u6570\u548c\u65b9\u6cd5\u53ef\u7528\u4f5c\u8f7b\u91cf\u7ea7\u540c\u6b65\u673a\u5236\uff0c\u4ece\u800c\u63d0\u9ad8\u5e76\u53d1\u4ee3\u7801\u7684\u6027\u80fd\u548c\u53ef\u7ef4\u62a4\u6027\u3002<\/p>\n<p><strong>\u51fd\u6570<\/strong><\/p>\n<p>\u51fd\u6570\u53ef\u4ee5\u5728\u7ebf\u7a0b\u4e4b\u95f4\u5171\u4eab\uff0c\u800c\u4e0d\u4f1a\u5bfc\u81f4\u6570\u636e\u7ade\u4e89\u3002\u8fd9\u662f\u56e0\u4e3a\u51fd\u6570\u662f\u4e0d\u53ef\u53d8\u7684\uff0c\u8fd9\u610f\u5473\u7740\u5b83\u4eec\u4e0d\u4f1a\u4fee\u6539\u4f20\u5165\u7684\u53c2\u6570\u3002\u8fd9\u4f7f\u5f97\u5b83\u4eec\u6210\u4e3a\u5728\u5e76\u53d1\u4efb\u52a1\u4e4b\u95f4\u5171\u4eab\u6570\u636e\u7684\u5b89\u5168\u9009\u62e9\u3002<\/p>\n<p><strong>\u793a\u4f8b\uff1a<\/strong><\/p>\n<pre>public static void updateValue(int newValue) {\n  \/\/ \u5bf9\u5171\u4eab\u53d8\u91cf\u8fdb\u884c\u539f\u5b50\u66f4\u65b0\n  sharedValue.set(newValue);\n}\n\npublic static int readValue() {\n  \/\/ \u4ece\u5171\u4eab\u53d8\u91cf\u8bfb\u53d6\u503c\n  return sharedValue.get();\n}<\/pre>\n<p>\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c<code>updateValue<\/code> \u548c <code>readValue<\/code> \u51fd\u6570\u7528\u4e8e\u66f4\u65b0\u548c\u8bfb\u53d6\u5171\u4eab\u53d8\u91cf <code>sharedValue<\/code>\u3002\u8fd9\u4e9b\u51fd\u6570\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u56e0\u4e3a <code>sharedValue<\/code> \u4ec5\u901a\u8fc7\u539f\u5b50\u64cd\u4f5c\u8fdb\u884c\u4fee\u6539\u548c\u8bbf\u95ee\u3002<\/p>\n<p><strong>\u65b9\u6cd5<\/strong><\/p>\n<p>\u65b9\u6cd5\u53ef\u4ee5\u7528\u4e8e\u5b9e\u73b0\u66f4\u590d\u6742\u7684\u5e76\u53d1\u539f\u8bed\uff0c\u4f8b\u5982\u4e92\u65a5\u9501\u548c\u6761\u4ef6\u53d8\u91cf\u3002\u8fd9\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528 <code>synchronized<\/code> \u5173\u952e\u5b57\u6765\u5b8c\u6210\uff0c\u8be5\u5173\u952e\u5b57\u786e\u4fdd\u540c\u4e00\u65f6\u523b\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\u53ef\u4ee5\u6267\u884c\u65b9\u6cd5\u3002<\/p>\n<p><strong>\u793a\u4f8b\uff1a<\/strong><\/p>\n<pre>public class MyLock {\n\n  private boolean locked = false;\n\n  public synchronized void lock() {\n    while (locked) {\n      try {\n        wait();\n      } catch (InterruptedException e) {\n        e.printStackTrace();\n      }\n    }\n\n    locked = true;\n  }\n\n  public synchronized void unlock() {\n    locked = false;\n    notifyAll();\n  }\n}<\/pre>\n<p>\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c<code>MyLock<\/code> \u7c7b\u5b9e\u73b0\u4e86\u7b80\u5355\u7684\u4e92\u65a5\u9501\u3002<code>lock<\/code> \u65b9\u6cd5\u4f7f\u7528 <code>synchronized<\/code> \u5173\u952e\u5b57\u786e\u4fdd\u540c\u4e00\u65f6\u523b\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\u53ef\u4ee5\u83b7\u5f97\u9501\u3002<code>unlock<\/code> \u65b9\u6cd5\u91ca\u653e\u9501\u5e76\u5524\u9192\u6b63\u5728\u7b49\u5f85\u9501\u7684\u4efb\u4f55\u7ebf\u7a0b\u3002<\/p>\n<p><strong>\u5b9e\u6218\u6848\u4f8b<\/strong><\/p>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e2a\u4f7f\u7528 Java \u51fd\u6570\u548c\u65b9\u6cd5\u8fdb\u884c\u5e76\u53d1\u7f16\u7a0b\u7684\u5b9e\u6218\u6848\u4f8b\uff1a<\/p>\n<pre>import java.util.concurrent.ExecutorService;\nimport java.util.concurrent.Executors;\n\npublic class ConcurrentCounter {\n\n  private static int count;\n\n  public static void incrementCount() {\n    count++;\n  }\n\n  public static synchronized int getCount() {\n    return count;\n  }\n\n  public static void main(String[] args) {\n    \/\/ \u521b\u5efa\u7ebf\u7a0b\u6c60\u5e76\u63d0\u4ea4\u5e76\u53d1\u4efb\u52a1\n    ExecutorService executor = Executors.newFixedThreadPool(10);\n    for (int i = 0; i &lt; 100000; i++) {\n      executor.submit(ConcurrentCounter::incrementCount);\n    }\n\n    executor.shutdown();\n\n    \/\/ \u7b49\u5f85\u4efb\u52a1\u5b8c\u6210\u5e76\u6253\u5370\u6700\u7ec8\u8ba1\u6570\n    while (!executor.isTerminated()) {\n      try {\n        Thread.sleep(10);\n      } catch (InterruptedException e) {\n        e.printStackTrace();\n      }\n    }\n\n    System.out.println(\"Final count: \" + ConcurrentCounter.getCount());\n  }\n}<\/pre>\n<p>\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c<code>incrementCount<\/code> \u51fd\u6570\u4f7f\u7528\u51fd\u6570\u4f7f\u8ba1\u6570\u5668\u53d8\u91cf <code>count<\/code> \u7684\u66f4\u65b0\u7ebf\u7a0b\u5b89\u5168\u3002<code>getCount<\/code> \u65b9\u6cd5\u4f7f\u7528 <code>synchronized<\/code> \u5173\u952e\u5b57\u4f7f\u83b7\u53d6\u8ba1\u6570\u5668\u503c\u7684\u4ee3\u7801\u5757\u7ebf\u7a0b\u5b89\u5168\u3002\u901a\u8fc7\u4f7f\u7528\u51fd\u6570\u548c\u65b9\u6cd5\u8fdb\u884c\u5e76\u53d1\u7f16\u7a0b\uff0c\u6211\u4eec\u80fd\u591f\u5b89\u5168\u5730\u5b9e\u73b0\u5e76\u53d1\u4efb\u52a1\u5bf9\u5171\u4eab\u6570\u636e\u7684\u4fee\u6539\u3002<\/p>\n<p>\u4eca\u5929\u5173\u4e8e\u300aJava \u51fd\u6570\u548c\u65b9\u6cd5\u5728\u5e76\u53d1\u7f16\u7a0b\u4e2d\u7684\u5e94\u7528\u662f\u4ec0\u4e48\uff1f\u300b\u7684\u5185\u5bb9\u5c31\u4ecb\u7ecd\u5230\u8fd9\u91cc\u4e86\uff0c\u662f\u4e0d\u662f\u5b66\u8d77\u6765\u4e00\u76ee\u4e86\u7136\uff01\u60f3\u8981\u4e86\u89e3\u66f4\u591a\u5173\u4e8ejava,\u51fd\u6570,\u65b9\u6cd5,\u5e76\u53d1\u7f16\u7a0b\u7684\u5185\u5bb9\u8bf7\u5173\u6ce8\u516c\u4f17\u53f7\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java \u51fd\u6570\u548c\u65b9\u6cd5\u5728\u5e76\u53d1\u7f16\u7a0b\u4e2d&#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-202518","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202518","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=202518"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202518\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202518"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202518"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202518"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}