{"id":202800,"date":"2025-05-22T09:11:46","date_gmt":"2025-05-22T01:11:46","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202800\/"},"modified":"2025-05-22T09:11:46","modified_gmt":"2025-05-22T01:11:46","slug":"java-%e5%87%bd%e6%95%b0%e5%ae%9e%e7%8e%b0%e7%ba%bf%e7%a8%8b%e5%ae%89%e5%85%a8%e7%9a%84%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202800\/","title":{"rendered":"Java \u51fd\u6570\u5b9e\u73b0\u7ebf\u7a0b\u5b89\u5168\u7684\u65b9\u6cd5"},"content":{"rendered":"

<\/b> <\/p>\n

Java \u51fd\u6570\u5b9e\u73b0\u7ebf\u7a0b\u5b89\u5168\u7684\u65b9\u6cd5<\/h1>\n

\u4ece\u73b0\u5728\u5f00\u59cb\uff0c\u52aa\u529b\u5b66\u4e60\u5427\uff01\u672c\u6587\u300aJava \u51fd\u6570\u5b9e\u73b0\u7ebf\u7a0b\u5b89\u5168\u7684\u65b9\u6cd5\u300b<\/span>\u4e3b\u8981\u8bb2\u89e3\u4e86<\/span>\u7b49\u7b49\u76f8\u5173\u77e5\u8bc6\u70b9\uff0c\u6211\u4f1a\u5728\u4e2d\u6301\u7eed\u66f4\u65b0\u76f8\u5173\u7684\u7cfb\u5217\u6587\u7ae0\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u5e76\u79ef\u6781\u7559\u8a00\u5efa\u8bae\u3002\u4e0b\u9762\u5c31\u5148\u4e00\u8d77\u6765\u770b\u4e00\u4e0b\u672c\u7bc7\u6b63\u6587\u5185\u5bb9\u5427\uff0c\u5e0c\u671b\u80fd\u5e2e\u5230\u4f60\uff01<\/p>\n

Java \u51fd\u6570\u5b9e\u73b0\u7ebf\u7a0b\u5b89\u5168\u7684\u65b9\u6cd5\uff1a\u540c\u6b65\u65b9\u6cd5\uff1a\u4f7f\u7528 synchronized \u5173\u952e\u5b57\uff0c\u4e00\u6b21\u4ec5\u5141\u8bb8\u4e00\u4e2a\u7ebf\u7a0b\u6267\u884c\u65b9\u6cd5\u3002\u663e\u5f0f\u9501\uff1a\u4f7f\u7528 ReentrantLock \u5b9e\u4f8b\u548c lock() \/ unlock() \u65b9\u6cd5\u63a7\u5236\u5bf9\u4e34\u754c\u533a\u7684\u8bbf\u95ee\u3002\u5b9e\u6218\u6848\u4f8b\uff1a\u5171\u4eab\u8ba1\u6570\u5668\u53ef\u4ee5\u4f7f\u7528\u540c\u6b65\u65b9\u6cd5\u786e\u4fdd\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u7684\u51c6\u786e\u6027\u3002\u5176\u4ed6\u8003\u8651\u56e0\u7d20\uff1a\u539f\u5b50\u64cd\u4f5c\u3001\u4e0d\u53ef\u53d8\u5bf9\u8c61\u3001\u9694\u79bb\u53ef\u4ee5\u8fdb\u4e00\u6b65\u63d0\u9ad8\u7ebf\u7a0b\u5b89\u5168\u6027\u3002<\/p>\n

<\/p>\n

Java \u51fd\u6570\u5b9e\u73b0\u7ebf\u7a0b\u5b89\u5168\u7684\u65b9\u6cd5<\/strong><\/p>\n

\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e2d\u786e\u4fdd\u7ebf\u7a0b\u5b89\u5168\u6027\u81f3\u5173\u91cd\u8981\u3002\u672c\u6587\u5c06\u63a2\u8ba8\u5982\u4f55\u4f7f\u7528\u540c\u6b65\u548c\u9501\u673a\u5236\u5728 Java \u51fd\u6570\u4e2d\u5b9e\u73b0\u7ebf\u7a0b\u5b89\u5168\u65b9\u6cd5\u3002<\/p>\n

\u540c\u6b65\u65b9\u6cd5<\/strong><\/p>\n

\u540c\u6b65\u65b9\u6cd5\u4f7f\u7528\u5185\u7f6e\u7684 monitor \u9501\uff0c\u4e00\u6b21\u53ea\u80fd\u7531\u4e00\u4e2a\u7ebf\u7a0b\u6267\u884c\u3002\u8981\u4f7f\u65b9\u6cd5\u540c\u6b65\uff0c\u53ea\u9700\u5728\u65b9\u6cd5\u58f0\u660e\u4e2d\u6dfb\u52a0 synchronized<\/code> \u5173\u952e\u5b57\uff1a<\/p>\n

public synchronized void updateValue(int value) {\n  \/\/ \u7ebf\u7a0b\u5b89\u5168\u4ee3\u7801\n}<\/pre>\n
\u663e\u5f0f\u9501<\/strong><\/p>\n
\u663e\u5f0f\u9501\u63d0\u4f9b\u4e86\u4e00\u79cd\u66f4\u7cbe\u7ec6\u7684\u540c\u6b65\u673a\u5236\u3002\u521b\u5efa ReentrantLock<\/code> \u5b9e\u4f8b\u5e76\u4f7f\u7528 lock()<\/code> \u548c unlock()<\/code> \u65b9\u6cd5\u6765\u63a7\u5236\u5bf9\u4e34\u754c\u533a\u7684\u8bbf\u95ee\uff1a<\/p>\n
private final ReentrantLock lock = new ReentrantLock();\n\npublic void updateValue(int value) {\n  lock.lock();\n  try {\n    \/\/ \u7ebf\u7a0b\u5b89\u5168\u4ee3\u7801\n  } finally {\n    lock.unlock();\n  }\n}<\/pre>\n
\u5b9e\u6218\u6848\u4f8b\uff1a\u5171\u4eab\u8ba1\u6570\u5668<\/strong><\/p>\n
\u8003\u8651\u4e00\u4e2a\u5171\u4eab\u7684\u8ba1\u6570\u5668\u7c7b\uff0c\u9700\u8981\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e2d\u4fdd\u6301\u51c6\u786e\u6027\uff1a<\/p>\n
public class Counter {\n\n  private int count;\n\n  public synchronized void increment() {\n    count++;\n  }\n\n  public int getCount() {\n    return count;\n  }\n}<\/pre>\n
\u901a\u8fc7\u4f7f\u7528\u540c\u6b65\u65b9\u6cd5 increment()<\/code>\uff0c\u6211\u4eec\u53ef\u4ee5\u786e\u4fdd\u6bcf\u6b21\u53ea\u6709\u5355\u4e2a\u7ebf\u7a0b\u53ef\u4ee5\u66f4\u65b0 count<\/code> \u5b57\u6bb5\uff0c\u4ece\u800c\u9632\u6b62\u6570\u636e\u7ade\u4e89\u6761\u4ef6\u3002<\/p>\n
\u5176\u4ed6\u8003\u8651\u56e0\u7d20<\/strong><\/p>\n
    \n
  • \u539f\u5b50\u64cd\u4f5c\uff1a<\/strong> \u67d0\u4e9b\u64cd\u4f5c\uff0c\u5982\u539f\u5b50\u9012\u589e\uff0c\u53ef\u4ee5\u4f7f\u7528\u539f\u5b50\u53d8\u91cf\u5b9e\u73b0\u7ebf\u7a0b\u5b89\u5168\uff0c\u65e0\u9700\u663e\u5f0f\u540c\u6b65\u3002<\/li>\n
  • \u4e0d\u53ef\u53d8\u5bf9\u8c61\uff1a<\/strong> \u4e0d\u53ef\u53d8\u5bf9\u8c61\u7684\u5b9e\u4f8b\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u56e0\u4e3a\u5b83\u4eec\u4e0d\u80fd\u4ece\u5916\u90e8\u4fee\u6539\u3002<\/li>\n
  • \u9694\u79bb\uff1a<\/strong> \u901a\u8fc7\u5c06\u7ebf\u7a0b\u5b89\u5168\u4ee3\u7801\u9694\u79bb\u5230\u5355\u72ec\u7684\u7c7b\u6216\u6a21\u5757\u4e2d\uff0c\u53ef\u4ee5\u63d0\u9ad8\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002<\/li>\n<\/ul>\n
    \u9075\u5faa\u8fd9\u4e9b\u539f\u5219\u53ef\u4ee5\u5e2e\u52a9\u60a8\u7f16\u5199\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e2d\u53ef\u9760\u8fd0\u884c\u7684 Java \u51fd\u6570\u3002<\/p>\n
    \u6587\u4e2d\u5173\u4e8ejava,\u7ebf\u7a0b\u5b89\u5168\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\u5b9e\u73b0\u7ebf\u7a0b\u5b89\u5168\u7684\u65b9\u6cd5\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":"
    Java \u51fd\u6570\u5b9e\u73b0\u7ebf\u7a0b\u5b89\u5168\u7684\u65b9\u6cd5...<\/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-202800","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202800","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=202800"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202800\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202800"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202800"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202800"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}