{"id":491,"date":"2013-09-27T16:41:33","date_gmt":"2013-09-27T08:41:33","guid":{"rendered":"http:\/\/coderbee.net\/?p=491"},"modified":"2013-09-27T17:28:19","modified_gmt":"2013-09-27T09:28:19","slug":"j-u-c-%e5%8c%85","status":"publish","type":"post","link":"https:\/\/coderbee.net\/index.php\/java\/20130927\/491","title":{"rendered":"J.U.C \u5305"},"content":{"rendered":"

\u6982\u8ff0<\/h2>\n

J.U.C \u5305\u662fjava.util.concurrent<\/code>\u5305\u7684\u7b80\u5199\u3002\u8fd9\u4e2a\u5305\u5728JDK5\u5f15\u5165\uff0c\u5927\u5927\u589e\u5f3a\u4e86Java\u7684\u5e76\u53d1\u7279\u6027\u3002JDK7\u8fd8\u5f15\u5165ForkJoin\u6846\u67b6\u3002<\/p>\n

\u8be5\u5305\u63d0\u4f9b\u7684\u80fd\u529b\u4e3b\u8981\u5305\u62ec\uff1a\u53ef\u91cd\u5165\u9501\uff0c\u5177\u6709\u539f\u5b50\u6027\u64cd\u4f5c\u5c5e\u6027\u7684\u7c7b\uff0c\u7ebf\u7a0b\u6c60\u6267\u884c\u670d\u52a1\uff0c\u8c03\u5ea6\u6267\u884c\u670d\u52a1\uff0c\u589e\u5f3a\u7684\u7ebf\u7a0b\u5b89\u5168\u5bb9\u5668\uff0c\u7ebf\u7a0b\u5173\u5361\uff0c\u4fe1\u53f7\u5668\uff0cForkJoin\u4efb\u52a1\u6267\u884c\u6846\u67b6\u7b49\u7b49\u3002
\n<\/p>\n

\u53ef\u91cd\u5165\u9501<\/h2>\n

\u5185\u5728\u9501<\/h3>\n

\u5728JDK5\u4e4b\u524d\uff0c\u8981\u83b7\u5f97\u540c\u6b65\u65b9\u6cd5\uff0c\u53ea\u80fd\u901a\u8fc7 synchronized<\/code> \u5173\u952e\u5b57\u6765\u8fbe\u5230\u3002<\/p>\n

synchronized<\/code> \u4f7f\u7528\u5185\u5728\u9501\u6216\u76d1\u89c6\u5668\u3002\u6bcf\u4e2aJava\u5bf9\u8c61\u6709\u4e00\u4e2a\u4e0e\u4e4b\u5173\u8054\u7684\u5185\u5728\u9501\u3002\u6bcf\u5f53\u4e00\u4e2a\u7ebf\u7a0b\u5c1d\u8bd5\u8bbf\u95ee\u540c\u6b65\u5757\u6216\u65b9\u6cd5\u65f6\uff0c\u5b83\u83b7\u53d6\u6b64\u5bf9\u8c61\u4e0a\u7684\u5185\u5728\u9501\u6216\u76d1\u89c6\u5668\u3002\u5bf9\u4e8e\u9759\u6001\u65b9\u6cd5\u7684\u60c5\u51b5\uff0c\u7ebf\u7a0b\u83b7\u53d6\u7c7b\u5bf9\u8c61\u4e0a\u7684\u9501\u3002\u5185\u5728\u9501\u673a\u5236\u4ece\u5199\u4ee3\u7801\u7684\u89d2\u5ea6\u662f\u4e2a\u7b80\u6d01\u7684\u65b9\u6cd5\uff0c\u9002\u7528\u4e8e\u5927\u591a\u6570\u60c5\u51b5\u3002<\/p>\n

\u5185\u5728\u9501\u7684\u5c40\u9650\uff1a<\/p>\n

    \n
  1. \u4e00\u4e2a\u7ebf\u7a0b\u5728\u7b49\u5f85\u83b7\u53d6\u4e00\u4e2a\u9501\u65f6\u6ca1\u6cd5\u4e2d\u65ad\u3002\uff08lock interruptibly\uff09<\/li>\n
  2. \u5c1d\u8bd5\u83b7\u53d6\u9501\u65f6\u6ca1\u6cd5\u4e0d\u6c38\u4e45\u7b49\u5f85\u3002\uff08try lock\uff09<\/li>\n
  3. \u6ca1\u6cd5\u5b9e\u73b0\u7ed3\u6784\u5316\u7684\u975e\u963b\u585e\u7684\u9501\u673a\u5236\uff0c\u56e0\u4e3a\u5185\u5728\u9501\u5fc5\u987b\u5728\u83b7\u53d6\u5b83\u7684\u540c\u4e00\u4e2a\u5757\u91cc\u91ca\u653e\u3002\uff08ReentrantLock\u53ef\u4ee5\u5728\u4e00\u4e2a\u65b9\u6cd5\u91cc\u83b7\u53d6\uff0c\u5728\u53e6\u4e00\u4e2a\u65b9\u6cd5\u91cc\u91ca\u653e\uff09<\/li>\n<\/ol>\n

    \u53ef\u91cd\u5165\u9501<\/h3>\n

    \u5f53\u7ebf\u7a0b\u8bf7\u6c42\u4e00\u4e2a\u7531\u5176\u5b83\u7ebf\u7a0b\u6301\u6709\u7684\u5bf9\u8c61\u9501\u65f6\uff0c\u8be5\u7ebf\u7a0b\u4f1a\u963b\u585e\uff1b\u800c\u5f53\u7ebf\u7a0b\u8bf7\u6c42\u7531\u81ea\u5df1\u6301\u6709\u7684\u5bf9\u8c61\u9501\u65f6\uff0c\u5982\u679c\u8be5\u9501\u662f\u91cd\u5165\u9501\uff0c\u8bf7\u6c42\u5c31\u4f1a\u6210\u529f\uff0c\u5426\u5219\u963b\u585e\u3002<\/p>\n

    ReentrantLock<\/h3>\n

    java.util.concurrent.locks.ReentrantLock<\/code> \u4e00\u4e2a\u53ef\u91cd\u5165\u7684\u4e92\u65a5\u9501\u3002\u6b64\u9501\u6700\u591a\u652f\u6301\u540c\u4e00\u4e2a\u7ebf\u7a0b\u53d1\u8d77\u7684 2147483648 \u4e2a\u9012\u5f52\u9501\u3002\u8bd5\u56fe\u8d85\u8fc7\u6b64\u9650\u5236\u4f1a\u5bfc\u81f4\u7531\u9501\u65b9\u6cd5\u629b\u51fa\u7684 Error\u3002<\/p>\n

    \u6765\u81eaJDK\u6587\u6863\u7684\u4f7f\u7528\u793a\u4f8b\uff1a<\/p>\n

    class X {\n     private final ReentrantLock lock = new ReentrantLock();\n     \/\/ ...\n\n     public void m() {\n          lock.lock();  \/\/ block until condition holds\n          try {\n               \/\/ ... method body\n          } finally {\n               lock.unlock()\n          }\n     }\n}\n<\/code><\/pre>\n
    ReentrantReadWriteLock<\/h3>\n
    java.util.concurrent.locks.ReentrantReadWriteLock<\/code>  \u652f\u6301\u8bfb\u9501\u3001\u5199\u9501\u5206\u79bb\u7684\u53ef\u91cd\u5165\u9501\uff0c\u4e0e ReentrantLock<\/code> \u7c7b\u4f3c\u3002<\/p>\n
    \u5177\u6709\u539f\u5b50\u6027\u64cd\u4f5c\u7279\u6027\u7684\u7c7b<\/h2>\n
    java.util.concurrent.atomic<\/code> \u5305\u63d0\u4f9b\u4e86\u5927\u91cf\u5177\u6709\u539f\u5b50\u6027\u64cd\u4f5c\u7684\u7c7b\uff0c\u63d0\u4f9b\u4e86\u6bd4volatile<\/code>\u5173\u952e\u5b57\u66f4\u591a\u7684\u529f\u80fd\u3002<\/p>\n
    volatile\u5173\u952e\u5b57<\/h3>\n
    volatile<\/code>\u5173\u952e\u5b57\u7528\u4e8e\u4fdd\u8bc1\u5176\u6240\u4fee\u9970\u7684\u5b57\u6bb5\u5177\u6709\u5185\u5b58\u53ef\u89c6\u6027\uff0c\u4e5f\u5c31\u662f\u5bf9\u8fd9\u4e9b\u5b57\u6bb5\u66f4\u65b0\u540e\uff0c\u7ebf\u7a0b\u540e\u7eed\u7684\u8bfb\u64cd\u4f5c\u603b\u80fd\u770b\u5230\u8fd9\u4e9b\u66f4\u65b0\uff1b\u7ebf\u7a0b\u8bfb\u53d6\u8fd9\u4e9b\u5b57\u6bb5\u4e86\uff0c\u4e5f\u80fd\u770b\u5230\u5176\u4ed6\u7ebf\u7a0b\u4e4b\u524d\u6240\u4f5c\u7684\u66f4\u65b0\u3002<\/p>\n
    \u4f46\u662fvolatile<\/code>\u4e0d\u652f\u6301\u4e00\u4e9b\u57fa\u672c\u7684\u64cd\u4f5c\uff0c\u6bd4\u5982\u5e76\u53d1\u60c5\u51b5\u4e0b\u7684\u8ba1\u6570\u95ee\u9898\u3002\u5bf9\u4e8e\u4e00\u4e2a\u5b57\u6bb5 volatile  int  count = 0<\/code>\uff0c\u6267\u884c count++;<\/code> \u662f\u5728\u5e76\u53d1\u60c5\u51b5\u4e0b\u5bf9count\u7684\u503c\u662f\u6ca1\u6709\u5b89\u5168\u4fdd\u8bc1\u7684\uff0c\u6709\u7684\u7ebf\u7a0b\u53ef\u80fd\u8bfb\u5230\u7684\u662f0<\/code>\uff0c\u6709\u7684\u53ef\u80fd\u662f1<\/code>\u3002<\/p>\n
    \u5bf9\u4e8e\u4e0b\u9762\u8fd9\u6837\u6bd4\u8f83\u540e\u66f4\u65b0\u7684\u60c5\u5f62\uff0cvolatile<\/code>\u4e5f\u6ca1\u6cd5\u4fdd\u8bc1\u5e76\u53d1\u5b89\u5168\u7684\u3002<\/p>\n
    boolean isLoad = false;\n\/\/  ...\nif (! isLoad) {\n     isLoad  = true;\n}\n<\/code><\/pre>\n
    \u539f\u5b50\u7c7b\u5c31\u662f\u7528\u6765\u89e3\u51b3\u8fd9\u7c7b\u9700\u6c42\u7684\u3002<\/p>\n
    \u539f\u5b50\u7c7b<\/h3>\n
    \u8be5\u5305\u7684\u7c7b\u5927\u591a\u63d0\u4f9b\u4e86\u5177\u6709CAS\uff08Compare And Swap\uff0c\u6bd4\u8f83\u540e\u4ea4\u6362\uff09\u7279\u6027\u7684\u65b9\u6cd5\uff0c\u7528\u4e8e\u539f\u5b50\u6027\u5730\u66f4\u65b0\u5b57\u6bb5\u7684\u503c\u3002<\/p>\n
    AtomicInteger<\/code> \u7684\u4e00\u4e9b\u65b9\u6cd5\uff1a<\/p>\n
    compareAndSet(int expect, int update)    \u5982\u679c\u5f53\u524d\u503c == \u9884\u671f\u503c\uff0c\u5219\u4ee5\u539f\u5b50\u65b9\u5f0f\u5c06\u8be5\u503c\u8bbe\u7f6e\u4e3a\u7ed9\u5b9a\u7684\u66f4\u65b0\u503c\u3002\naddAndGet(int delta)    \u4ee5\u539f\u5b50\u65b9\u5f0f\u5c06\u7ed9\u5b9a\u503c\u4e0e\u5f53\u524d\u503c\u76f8\u52a0\u3002\ndecrementAndGet()      \u4ee5\u539f\u5b50\u65b9\u5f0f\u5c06\u5f53\u524d\u503c\u51cf 1\u3002\ngetAndAdd(int delta)     \u4ee5\u539f\u5b50\u65b9\u5f0f\u5c06\u7ed9\u5b9a\u503c\u4e0e\u5f53\u524d\u503c\u76f8\u52a0\u3002\ngetAndDecrement()      \u4ee5\u539f\u5b50\u65b9\u5f0f\u5c06\u5f53\u524d\u503c\u51cf 1\u3002\ngetAndSet(int newValue)    \u4ee5\u539f\u5b50\u65b9\u5f0f\u8bbe\u7f6e\u4e3a\u7ed9\u5b9a\u503c\uff0c\u5e76\u8fd4\u56de\u65e7\u503c\u3002\nset(int newValue)              \u8bbe\u7f6e\u4e3a\u7ed9\u5b9a\u503c\u3002\nget()                                \u83b7\u53d6\u5f53\u524d\u503c\u3002\n<\/code><\/pre>\n
    \u65e0\u9501\u7b97\u6cd5<\/h4>\n
    \u539f\u5b50\u7c7b\u9664\u4e86\u89e3\u51b3\u4e0a\u9762\u7684\u8fd9\u4e9b\u95ee\u9898\uff0c\u8fd8\u53ef\u4ee5\u7528\u6765\u5b9e\u73b0\u4e00\u4e9b\u65e0\u9501\u7b97\u6cd5\u3002\u5b9e\u73b0\u60c5\u5f62\u5927\u81f4\u662f\u8fd9\u6837\u7684\uff1a<\/p>\n
    AtomicInteger  counter = new AtomicInteger(0);\n\/\/   ....\n\nint  oldValue,  newValue;\n\ndo {\n     oldValue = counter.get();\n\n     \/\/  synchronized  code  trunk \n\n     newValue = oldVaue+1;\n}while( !  counter.compareAndSet(oldValue,  newValue) );\n<\/code><\/pre>\n
    \u8fd9\u7c7b\u5b9e\u73b0\u8ba4\u4e3a\uff0c\u5982\u679c\u4e00\u4e2a\u53d8\u91cf\u5b83\u7684\u503c\u5728\u540c\u6b65\u4ee3\u7801\u5757\u8bbf\u95ee\u524d\u540e\u6ca1\u6709\u4fee\u6539\uff0c\u5c31\u8ba4\u4e3a\u6ca1\u6709\u7ebf\u7a0b\u5e76\u53d1\u6267\u884c\u4e86\u8fd9\u4e2a\u4ee3\u7801\u5757\u3002<\/p>\n
    \u65e0\u9501\u7b97\u6cd5\u57fa\u672c\u4e0a\u5229\u7528\u4e86\u8fd9\u4e2a\u601d\u60f3\uff1a\u628a\u540c\u6b65\u5757\u6700\u5c0f\u5316\u5230\u5355\u4e2a\u53d8\u91cf\u4e0a\u3002\u5bf9\u4e8e\u6bcf\u4e2a\u540c\u6b65\u6761\u4ef6\uff0c\u90fd\u9700\u8981\u4e00\u4e2a\u5177\u6709CAS\u65b9\u6cd5\u7684\u7c7b\uff1b\u5982\u679c\u540c\u6b65\u6761\u4ef6\u592a\u591a\uff0c\u8fd8\u662f\u7528\u9501\u7b80\u5355\u70b9\u3002<\/p>\n
    ABA\u95ee\u9898<\/h4>\n
    \u5bf9\u4e8e\u4e0a\u9762\u8fd9\u7c7b\u65e0\u9501\u7b97\u6cd5\u5b9e\u73b0\u7684\u4e00\u4e2a\u95ee\u9898\u662f\uff1aoldValue = counter.get();<\/code> \u8bed\u53e5\u6267\u884c\u5b8c\u540e\uff0c counter<\/code>\u7684\u503c\u4e3a A<\/code>\uff0c\u8fd9\u4e2a\u7ebf\u7a0bT1\u88ab\u6302\u8d77\uff0c\u53e6\u4e00\u4e2a\u7ebf\u7a0bT2\u5bf9 counter<\/code>\u8fdb\u884c\u66f4\u65b0\uff0c\u628a\u503c\u6539\u4e3aB<\/code>\uff0c\u7136\u540e\u53c8\u66f4\u65b0\u4e3aA<\/code>\uff0c\u5f53T1\u6062\u590d\u6267\u884c\u7684\u65f6\u5019\uff0c\u5176\u5b9e\u4e0a\u4e0b\u6587\u5df2\u7ecf\u88ab\u4fee\u6539\uff0c\u800c\u5b83\u5374\u6ca1\u6cd5\u77e5\u9053\uff0c\u56e0\u4e3a\u503c\u8fd8\u662fA<\/code>\u3002\u8fd9\u5c31\u662f\u201cABA\u95ee\u9898\u201d\uff08\u6b64\u5904\u5e94\u8be5google\uff09\u3002<\/p>\n
    \u6b64\u5305\u4e3a\u89e3\u51b3ABA\u95ee\u9898\u63d0\u4f9b\u4e86\u4e00\u4e2a\u7c7b\uff1aAtomicStampedReference<\/code>\uff0c\u7ef4\u62a4\u5e26\u6709\u6574\u6570\u201c\u6807\u5fd7\u201d\u7684\u5bf9\u8c61\u5f15\u7528\uff0c\u53ef\u4ee5\u7528\u539f\u5b50\u65b9\u5f0f\u5bf9\u5176\u8fdb\u884c\u66f4\u65b0\u3002<\/p>\n
    \u7ebf\u7a0b\u6c60\u6267\u884c\u670d\u52a1<\/h2>\n
    JDK5\u4ee5\u524d\u7684\u591a\u7ebf\u7a0b<\/h3>\n
    \u5728JDK5\u4ee5\u524d\uff0c\u5229\u7528Java\u7684\u5e76\u53d1\u80fd\u529b\u4e00\u822c\u6709\u4e24\u79cd\u65b9\u5f0f\uff1a\u7ee7\u627f\u81eaThread\u7c7b\u5e76\u8986\u5199run<\/code>\u65b9\u6cd5\uff1b \u6216\u8005\u5b9e\u73b0Runnable<\/code> \u63a5\u53e3\uff0c\u5c06\u5b9e\u73b0\u7684\u5b9e\u4f8b\u4f20\u9012\u7ed9Thread\u6784\u9020\u51fd\u6570\uff0c\u518d\u8c03\u7528Thread.start<\/code>\u65b9\u6cd5\u6765\u542f\u52a8\u4e00\u4e2a\u7ebf\u7a0b\u3002\u4ee3\u7801\u5927\u6982\u5982\u4e0b\uff1a<\/p>\n
    static class MyThread extends Thread {\n       @Override\n       public void run() {\n             \/\/ do something in other thread .\n      }\n}\n\nstatic class Task implements Runnable {\n       @Override\n       public void run() {\n             \/\/ task command .\n      }\n}\n\npublic static void main(String[] args) {\n      MyThread myThread = new MyThread();\n      myThread.start();\n\n      Task task = new Task();\n      Thread thread = new Thread(task);\n      thread.start();\n}\n<\/code><\/pre>\n
    \u8fd9\u91cc\u8981\u8bf4\u660e\u7684\u662f\uff1aRunnable<\/code> \u5b9e\u73b0\u662f\u4e00\u4e2a\u4efb\u52a1\uff0c\u662f\u6307\u4ee4\u96c6\u5408\uff0c\u4e0d\u80fd\u81ea\u5df1\u8fd0\u884c\uff1bThread<\/code> \u624d\u662f\u4e00\u4e2a\u53ef\u6267\u884c\u7684\u5355\u5143\uff0c\u662f\u4e00\u4e2a\u201cCPU\u201d\u3002\u662fThread<\/code>\u9a71\u52a8\u6267\u884c\u4efb\u52a1Runnable<\/code>\u3002<\/p>\n
    \u5bf9\u4e8eThread<\/code>\u5bf9\u8c61\uff0c\u5f53\u5b83\u7684run<\/code>\u65b9\u6cd5\u6267\u884c\u5b8c\u6210\u540e\uff0c\u7ebf\u7a0b\u5c31\u8fdb\u5165\u5b8c\u6210\u72b6\u6001\uff0c\u7b49\u5f85\u9500\u6bc1\u3002<\/p>\n
    \u5f53\u9700\u8981\u5f02\u6b65\u6267\u884c\u4e00\u4e2a\u4efb\u52a1\u65f6\uff0c\u5c31\u65b0\u5efa\u4e00\u4e2a\u7ebf\u7a0b\uff0c\u5f53\u4e00\u4e2a\u865a\u62df\u673a\u65b0\u5efa\u4e86\u51e0\u767e\u4e0a\u5343\u4e2a\u7ebf\u7a0b\u65f6\uff0c\u8fd9\u4f1a\u5e26\u6765\u5f88\u591a\u95ee\u9898\uff1a<\/p>\n
      \n
    1. \u4e0a\u4e0b\u6587\u5207\u6362\u4ee3\u4ef7\u3002Java\u7684\u7ebf\u7a0b\u662f\u8981\u6620\u5c04\u5230\u5185\u6838\u7ebf\u7a0b\u4e0a\u53bb\u6267\u884c\u7684\uff0c\u7ebf\u7a0b\u592a\u591a\u65f6\u57fa\u672c\u4e0a\u5c31\u6ca1\u6cd5\u8fdb\u884c\u6709\u6548\u7684\u8c03\u5ea6\u6267\u884c\uff0c\u7ebf\u7a0b\u4e4b\u95f4\u7684\u4e0a\u4e0b\u6587\u5207\u6362\u5c31\u4f1a\u5360\u7528\u5f88\u591a\u7684CPU\u5468\u671f\u3002<\/li>\n
    2. \u5185\u5b58\u8d44\u6e90\u5360\u7528\u3002JVM\u65b0\u5efa\u4e00\u4e2a\u7ebf\u7a0b\u540e\uff0c\u8981\u7ed9\u7ebf\u7a0b\u5206\u914d\u76f8\u5e94\u7684\u65b9\u6cd5\u6808\u3001\u7a0b\u5e8f\u8ba1\u6570\u5668\u7b49\u8d44\u6e90\uff0c\u8fd9\u4e9b\u90fd\u4f1a\u5360\u7528\u7684\u4e00\u5b9a\u7684\u5185\u5b58\u8d44\u6e90\uff0c\u7ebf\u7a0b\u5f88\u591a\u65f6\uff0c\u8fd9\u4e9b\u8d44\u6e90\u5c31\u4e0d\u5c0f\u4e86\u3002<\/li>\n<\/ol>\n
      \u8fd9\u4e9b\u95ee\u9898\u8bf4\u660e\uff0c\u5927\u91cf\u521b\u5efa\u7ebf\u7a0b\u4e0d\u662f\u4e2a\u597d\u4e3b\u610f\uff0c\u6211\u4eec\u9700\u8981\u91cd\u7528\u5df2\u521b\u5efa\u7684\u7ebf\u7a0b\u3002\u8fd9\u5c31\u662f\u7ebf\u7a0b\u6c60\u7684\u4f5c\u7528\u3002<\/p>\n
      \u7ebf\u7a0b\u91cd\u7528\u7684\u6700\u57fa\u672c\u539f\u7406<\/h3>\n
      \u65e2\u7136Thread\u7684run\u65b9\u6cd5\u6267\u884c\u5b8c\u6210\u5c31\u8868\u793a\u4e00\u4e2a\u7ebf\u7a0b\u5df2\u7ec8\u6b62\uff0c\u90a3\u4e48\u5c31\u9700\u8981\u5728\u8fd9\u4e2arun\u65b9\u6cd5\u4e0a\u505a\u70b9\u5904\u7406\uff0c\u8ba9\u5b83\u80fd\u6301\u7eed\u5730\u5904\u7406\u6211\u4eec\u7684\u4efb\u52a1\u3002<\/p>\n
      import java.util.concurrent.LinkedBlockingQueue;\n\npublic class SimpleReuseThread extends Thread {\n       private volatile boolean isStop = false;\n       private LinkedBlockingQueue<Runnable> taskQueue = new LinkedBlockingQueue<>(\n                  1024);\n\n       public boolean submitTask(Runnable task) {\n             return taskQueue .add(task);\n      }\n\n       public void run() {\n             while (!isStop ) {\n                   if (!taskQueue .isEmpty()) {\n                        Runnable task = taskQueue.peek();\n                        task.run();\n                  } else {\n                         try {\n                              Thread. sleep(1000);\n                        } catch (InterruptedException ignore) {\n                        }\n                  }\n            }\n      }\n\n       public void shutDown() {\n             isStop = true ;\n      }\n}\n<\/code><\/pre>\n
      \u4e0a\u9762\u7684\u4ee3\u7801\u8db3\u4ee5\u8bf4\u660e\u7ebf\u7a0b\u590d\u7528\u7684\u6700\u57fa\u672c\u539f\u7406\u3002\u4f46\u597d\u7684\u7ebf\u7a0b\u6c60\u5b9e\u73b0\u8fd8\u9700\u8981\u5904\u7406\uff1a\u7ebf\u7a0b\u6c60\u751f\u547d\u5468\u671f\u7ba1\u7406\u3001\u7ebf\u7a0b\u590d\u7528\u3001\u5de5\u4f5c\u4efb\u52a1\u961f\u5217\u7ba1\u7406\u3001\u9ad8\u6548\u5730\u5206\u6d3e\u4efb\u52a1\u5230\u6267\u884c\u7ebf\u7a0b\u7b49\u5de5\u4f5c\u3002\u597d\u6d88\u606f\u662f\u5df2\u7ecf\u6709\u6ee1\u8db3\u8fd9\u4e9b\u9700\u6c42\u7684\u7ebf\u7a0b\u6c60\u5b9e\u73b0\u4e86\u3002<\/p>\n
      J.U.C\u7684\u7ebf\u7a0b\u6c60<\/h3>\n
      J.U.C\u7684\u7ebf\u7a0b\u6c60\u5c01\u88c5\u4e3a java.util.concurrent.ExecutorService<\/code> \u63a5\u53e3\u3002\u8be5\u63a5\u53e3\u63d0\u4f9b\u4e86\u65b9\u6cd5\u7528\u4e8e \u63d0\u4ea4\u4efb\u52a1\u3001\u6267\u884c\u4efb\u52a1\u3001\u67e5\u8be2\u7ebf\u7a0b\u6c60\u662f\u5426\u5df2\u88ab\u5173\u95ed\u3001\u5173\u95ed\u7ebf\u7a0b\u6c60\u3002<\/p>\n
      java.util.concurrent.Executors<\/code> \u63d0\u4f9b\u4e86\u4fbf\u6377\u7684\u65b9\u6cd5\u7528\u4e8e\u521b\u5efa\u5404\u79cd\u7ebf\u7a0b\u6c60\uff1a<\/p>\n
      newCachedThreadPool()                       \u521b\u5efa\u4e00\u4e2a\u53ef\u6839\u636e\u9700\u8981\u521b\u5efa\u65b0\u7ebf\u7a0b\u7684\u7ebf\u7a0b\u6c60\uff0c\u4f46\u662f\u5728\u4ee5\u524d\u6784\u9020\u7684\u7ebf\u7a0b\u53ef\u7528\u65f6\u5c06\u91cd\u7528\u5b83\u4eec\u3002\nnewFixedThreadPool(int nThreads)            \u521b\u5efa\u4e00\u4e2a\u53ef\u91cd\u7528\u56fa\u5b9a\u7ebf\u7a0b\u6570\u7684\u7ebf\u7a0b\u6c60\uff0c\u4ee5\u5171\u4eab\u7684\u65e0\u754c\u961f\u5217\u65b9\u5f0f\u6765\u8fd0\u884c\u8fd9\u4e9b\u7ebf\u7a0b\u3002\nnewScheduledThreadPool(int corePoolSize)    \u521b\u5efa\u4e00\u4e2a\u7ebf\u7a0b\u6c60\uff0c\u5b83\u53ef\u5b89\u6392\u5728\u7ed9\u5b9a\u5ef6\u8fdf\u540e\u8fd0\u884c\u547d\u4ee4\u6216\u8005\u5b9a\u671f\u5730\u6267\u884c\u3002\nnewScheduledThreadPool(int corePoolSize)    \u521b\u5efa\u4e00\u4e2a\u7ebf\u7a0b\u6c60\uff0c\u5b83\u53ef\u5b89\u6392\u5728\u7ed9\u5b9a\u5ef6\u8fdf\u540e\u8fd0\u884c\u547d\u4ee4\u6216\u8005\u5b9a\u671f\u5730\u6267\u884c\u3002\nnewSingleThreadExecutor()                   \u521b\u5efa\u4e00\u4e2a\u4f7f\u7528\u5355\u4e2a worker \u7ebf\u7a0b\u7684 Executor\uff0c\u4ee5\u65e0\u754c\u961f\u5217\u65b9\u5f0f\u6765\u8fd0\u884c\u8be5\u7ebf\u7a0b\u3002\nnewSingleThreadScheduledExecutor()           \u521b\u5efa\u4e00\u4e2a\u5355\u7ebf\u7a0b\u6267\u884c\u7a0b\u5e8f\uff0c\u5b83\u53ef\u5b89\u6392\u5728\u7ed9\u5b9a\u5ef6\u8fdf\u540e\u8fd0\u884c\u547d\u4ee4\u6216\u8005\u5b9a\u671f\u5730\u6267\u884c\u3002\n<\/code><\/pre>\n
      Future<\/h3>\n
      \u5f53\u628a\u4efb\u52a1\u63d0\u4ea4\u5230\u7ebf\u7a0b\u6c60\uff08java.util.concurrent.ExecutorService<\/code>\uff09\u53bb\u6267\u884c\u540e\uff0c\u7ebf\u7a0b\u6c60\u4f1a\u8fd4\u56de\u4e00\u4e2a\u8868\u793a\u4efb\u52a1\u76f4\u63a5\u7ed3\u679c\u7684\u63a5\u53e3Future<\/code>\uff0c\u5f53\u524d\u7ebf\u7a0b\u53ef\u4ee5\u7ee7\u7eed\u5f80\u4e0b\u6267\u884c\u5176\u4ed6\u903b\u8f91\uff0c\u5728\u67d0\u4e2a\u65f6\u95f4\u70b9\uff0c\u5b83\u53ef\u4ee5\u67e5\u8be2\u4efb\u52a1\u662f\u5426\u6267\u884c\u5b8c\u6210\uff0c\u5982\u679c\u6267\u884c\u5b8c\u6210\uff0c\u8fd8\u53ef\u4ee5\u83b7\u53d6\u4efb\u52a1\u8fd4\u56de\u7684\u7ed3\u679c\u3002<\/p>\n
      \u6765\u81eadoc\u6587\u6863\u7684\u4f7f\u7528\u793a\u4f8b\uff1a<\/p>\n
      interface ArchiveSearcher { String search(String target); }\nclass App {\n   ExecutorService executor = ...\n   ArchiveSearcher searcher = ...\n   void showSearch(final String target)  throws InterruptedException {\n\n     Future<String> future = executor.submit(new Callable<String>() {\n            public String call() {\n                 return searcher.search(target);\n            }});\n     displayOtherThings(); \/\/ do other things while searching\n     try {\n          displayText(future.get()); \/\/ use future\n     } catch (ExecutionException ex) { cleanup(); return; }\n   }\n}\n\n<\/code><\/pre>\n
      \u8c03\u5ea6\u6267\u884c\u670d\u52a1<\/h2>\n
      Timer<\/code><\/h3>\n
      \u5728JDK5\u4ee5\u524d\uff0c\u5982\u679c\u9700\u8981\u5b9a\u65f6\u6216\u5468\u671f\u6027\u5730\u6267\u884c\u67d0\u4e2a\u4efb\u52a1\uff0c\u53ef\u4ee5\u901a\u8fc7 java.util.Timer<\/code> \u7c7b\u6765\u5b9e\u73b0\u3002<\/p>\n
      Timer<\/code> \u7684\u7f3a\u9677\uff1a<\/h4>\n
        \n
      1. \u6240\u6709\u4efb\u52a1\u90fd\u662f\u7531\u540c\u4e00\u4e2a\u7ebf\u7a0b\u6765\u8c03\u5ea6\uff0c\u56e0\u6b64\u6240\u6709\u4efb\u52a1\u90fd\u662f\u4e32\u884c\u6267\u884c\u7684\uff0c\u540c\u4e00\u65f6\u95f4\u53ea\u80fd\u6709\u4e00\u4e2a\u4efb\u52a1\u5728\u6267\u884c\uff0c\u524d\u4e00\u4e2a\u4efb\u52a1\u7684\u5ef6\u8fdf\u6216\u5f02\u5e38\u90fd\u5c06\u4f1a\u5f71\u54cd\u5230\u4e4b\u540e\u7684\u4efb\u52a1\uff1b\uff08\u5ef6\u8fdf\u7d2f\u52a0\uff09<\/li>\n
      2. Timer<\/code>\u7ebf\u7a0b\u4e0d\u6355\u83b7\u5f02\u5e38\uff0c\u5982\u679cTimerTask<\/code>\u629b\u51fa\u5f02\u5e38\uff0c\u5c06\u5bfc\u81f4Timer<\/code>\u7ebf\u7a0b\u7ec8\u6b62\u3002\u5982\u679cTimer<\/code> \u7684\u7ebf\u7a0b\u6b7b\u6389\u4e86\uff0c\u6240\u6709\u4efb\u52a1\u90fd\u4e0d\u4f1a\u518d\u6267\u884c\u3002<\/li>\n
      3. Timer<\/code>\u5bf9\u8c03\u5ea6\u7684\u652f\u6301\u662f\u57fa\u4e8e\u7edd\u5bf9\u65f6\u95f4\u7684\uff0c\u800c\u4e0d\u662f\u76f8\u5bf9\u65f6\u95f4\uff0c\u56e0\u6b64\u4efb\u52a1\u5bf9\u7cfb\u7edf\u65f6\u949f\u7684\u6539\u53d8\u662f\u654f\u611f\u7684\uff1b\u4e0b\u9762\u7684\u8c03\u5ea6\u670d\u52a1\u53ea\u652f\u6301\u76f8\u5bf9\u65f6\u95f4\u3002<\/li>\n<\/ol>\n
        \u5982\u679c\u8fd8\u5728\u7528 Timer<\/code> \u8fdb\u884c\u8c03\u5ea6\uff0c\u771f\u8be5\u597d\u597d\u8003\u8651\u8c03\u5ea6\u6267\u884c\u670d\u52a1\u4e86\u3002<\/p>\n
        \u8c03\u5ea6\u670d\u52a1<\/h3>\n
        \u8fd9\u91cc\u8bf4\u7684\u8c03\u5ea6\u670d\u52a1\u5176\u5b9e\u662f\u7ebf\u7a0b\u6c60\u63d0\u4f9b\u7684\u6269\u5c55\u80fd\u529b\uff0c\u8c03\u5ea6\u670d\u52a1\u5c01\u88c5\u4e3ajava.util.concurrent.ScheduledExecutorService<\/code> \u63a5\u53e3\u3002\u5b83\u89e3\u51b3\u4e86\u4e0a\u9762\u7684Timer<\/code>\u7f3a\u9677\u3002<\/p>\n
        schedule(Callable<V> callable, long delay, TimeUnit unit)           \u521b\u5efa\u5e76\u6267\u884c\u5728\u7ed9\u5b9a\u5ef6\u8fdf\u540e\u542f\u7528\u7684 ScheduledFuture\u3002\nschedule(Runnable command, long delay, TimeUnit unit)               \u521b\u5efa\u5e76\u6267\u884c\u5728\u7ed9\u5b9a\u5ef6\u8fdf\u540e\u542f\u7528\u7684\u4e00\u6b21\u6027\u64cd\u4f5c\u3002\nscheduleAtFixedRate(Runnable command, long initialDelay, long period, TimeUnit unit)             \u521b\u5efa\u5e76\u6267\u884c\u4e00\u4e2a\u5728\u7ed9\u5b9a\u521d\u59cb\u5ef6\u8fdf\u540e\u9996\u6b21\u542f\u7528\u7684\u5b9a\u671f\u64cd\u4f5c\uff0c\u540e\u7eed\u64cd\u4f5c\u5177\u6709\u7ed9\u5b9a\u7684\u5468\u671f\uff1b\u4e5f\u5c31\u662f\u5c06\u5728 initialDelay \u540e\u5f00\u59cb\u6267\u884c\uff0c\u7136\u540e\u5728 initialDelay+period \u540e\u6267\u884c\uff0c\u63a5\u7740\u5728 initialDelay + 2 * period \u540e\u6267\u884c\uff0c\u4f9d\u6b64\u7c7b\u63a8\u3002\nscheduleWithFixedDelay(Runnable command, long initialDelay, long delay, TimeUnit unit)           \u521b\u5efa\u5e76\u6267\u884c\u4e00\u4e2a\u5728\u7ed9\u5b9a\u521d\u59cb\u5ef6\u8fdf\u540e\u9996\u6b21\u542f\u7528\u7684\u5b9a\u671f\u64cd\u4f5c\uff0c\u968f\u540e\uff0c\u5728\u6bcf\u4e00\u6b21\u6267\u884c\u7ec8\u6b62\u548c\u4e0b\u4e00\u6b21\u6267\u884c\u5f00\u59cb\u4e4b\u95f4\u90fd\u5b58\u5728\u7ed9\u5b9a\u7684\u5ef6\u8fdf\u3002\n<\/code><\/pre>\n\n
        \u5148\u5199\u8fd9\u4e48\u591a\uff0c\u4ee5\u540e\u518d\u8865\u5145\u3002<\/p>\n
        \u589e\u5f3a\u7684\u7ebf\u7a0b\u5b89\u5168\u5bb9\u5668<\/h2>\n
        \u7ebf\u7a0b\u5173\u5361<\/h2>\n
        \u4fe1\u53f7\u5668<\/h2>\n
        ForkJoin\u4efb\u52a1\u6267\u884c\u6846\u67b6<\/h2>\n\n
        \u6b22\u8fce\u5173\u6ce8\u6211\u7684\u5fae\u4fe1\u516c\u4f17\u53f7: coderbee\u7b14\u8bb0<\/strong>\uff0c\u53ef\u4ee5\u66f4\u53ca\u65f6\u56de\u590d\u4f60\u7684\u8ba8\u8bba\u3002<\/p>\n
        <\/p>\n","protected":false},"excerpt":{"rendered":"
        \u6982\u8ff0 J.U.C \u5305\u662fjava.util.concurrent\u5305\u7684\u7b80\u5199\u3002\u8fd9\u4e2a\u5305\u5728 … \u7ee7\u7eed\u9605\u8bfb →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[95,231],"_links":{"self":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts\/491"}],"collection":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/comments?post=491"}],"version-history":[{"count":10,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts\/491\/revisions"}],"predecessor-version":[{"id":499,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts\/491\/revisions\/499"}],"wp:attachment":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/media?parent=491"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/categories?post=491"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/tags?post=491"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}