Java中CyclicBarrier的用法分析

public class TestCyclicBarrier {

     private static final int THREAD_NUM = 5;

     public static class WorkerThread implements Runnable{

         CyclicBarrier barrier;

         public WorkerThread(CyclicBarrier b){
             this.barrier = b;
         }

         @Override
         public void run() {
             // TODO Auto-generated method stub
             try{
                 System.out.println("Worker's waiting");
                 //线程在这里等待，直到所有线程都到达barrier。
                 barrier.await();
                 System.out.println("ID:"+Thread.currentThread().getId()+" Working");
             }catch(Exception e){
                 e.printStackTrace();
             }
         }

     }

     /**
      * @param args
      */
     public static void main(String[] args) {
         // TODO Auto-generated method stub
         CyclicBarrier cb = new CyclicBarrier(THREAD_NUM, new Runnable() {
             //当所有线程到达barrier时执行
             @Override
             public void run() {
                 // TODO Auto-generated method stub
                 System.out.println("Inside Barrier");

             }
         });

         for(int i=0;i<THREAD_NUM;i++){
             new Thread(new WorkerThread(cb)).start();
         }
     }

 }
 /*
 以下是输出：
 Worker's waiting
 Worker's waiting
 Worker's waiting
 Worker's waiting
 Worker's waiting
 Inside Barrier
 ID:12 Working
 ID:8 Working
 ID:11 Working
 ID:9 Working
 ID:10 Working
 */