线程并发工具--CyclicBarrier

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CyclicBarrier能实现的效果是多个线程同时执行，这些线程执行的时间不一。但是要求在某一个点上，需要这些线程都执行完毕了之后，全部线程才能往下执行。

下面是示例程序：

ExecutorService service = Executors.newCachedThreadPool();final CyclicBarrier cyclicBarrier = new CyclicBarrier(3);for(int i = 0;i<3;i++){Runnable runnable = new Runnable(){Random random = new Random();@Overridepublic void run() {try {Thread.sleep(random.nextInt(5000));System.out.println("point 1:"+Thread.currentThread().getName()+" execute complate.");cyclicBarrier.await();} catch (InterruptedException | BrokenBarrierException e) {e.printStackTrace();}try {Thread.sleep(random.nextInt(5000));System.out.println("point 2:"+Thread.currentThread().getName()+" execute complate.");cyclicBarrier.await();} catch (InterruptedException | BrokenBarrierException e) {e.printStackTrace();}try {Thread.sleep(random.nextInt(5000));System.out.println("point 3:"+Thread.currentThread().getName()+" execute complate.");cyclicBarrier.await();} catch (InterruptedException | BrokenBarrierException e) {e.printStackTrace();}try {Thread.sleep(random.nextInt(5000));System.out.println("point 4:"+Thread.currentThread().getName()+" execute complate.");cyclicBarrier.await();} catch (InterruptedException | BrokenBarrierException e) {e.printStackTrace();}}};service.execute(runnable);//service.shutdown();}

执行结果：

point 1:pool-1-thread-3 execute complate.point 1:pool-1-thread-2 execute complate.point 1:pool-1-thread-1 execute complate.point 2:pool-1-thread-2 execute complate.point 2:pool-1-thread-1 execute complate.point 2:pool-1-thread-3 execute complate.point 3:pool-1-thread-3 execute complate.point 3:pool-1-thread-1 execute complate.point 3:pool-1-thread-2 execute complate.point 4:pool-1-thread-1 execute complate.point 4:pool-1-thread-2 execute complate.point 4:pool-1-thread-3 execute complate.

可以看到，到达么一个点的顺序可能不固定，但是没有说一个线程才到达point1的时候，另外一个线程已经达到point2了，即大家共同达到一个点之后才会继续往下执行。

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