CyclicBarrier与CountDownLatch的区别

import java.util.concurrent.CountDownLatch;
/**
 * 作用于单个线程或几个线程，，在其他线程执行完之前，一直等待（await）知道countDown为零
 * @author Administrator
 *
 */
public class CountDownlatchTest {
    public static void main(String[] args) throws InterruptedException {
        CountDownLatch countDownLatch = new CountDownLatch(5);
        for(int i=0;i<5;i++){
            new Thread(new readNum(i,countDownLatch)).start();
        }
        countDownLatch.await();
        System.out.println("线程执行结束。。。。");
    }  

    static class readNum  implements Runnable{
        private int id;
        private CountDownLatch latch;
        public readNum(int id,CountDownLatch latch){
            this.id = id;
            this.latch = latch;
        }
        @Override
        public void run() {
            synchronized (this){
                System.out.println("id:"+id);
                latch.countDown();
                System.out.println("线程组任务"+id+"结束，其他任务继续");
            }
        }
    }
}  

/**
 * 作用于多个线程
 * 可以通过CyclicBarrier实现没有先后顺序的同时执行任意的线程（假设cpu也是任意个）
 * 多个线程一直阻塞，直到await数量达到CyclicBarrier的参数时，唤醒阻塞的线程
 * 可重用
 * @author Administrator
 *
 */
public class CyclicBarrierTest {
    public static void main(String[] args) throws InterruptedException {
        CyclicBarrier cyclicBarrier = new CyclicBarrier(5, new Runnable() {
            @Override
            public void run() {
                System.out.println("线程组执行结束");
            }
        });
        for (int i = 0; i < 5; i++) {
            new Thread(new readNum(i,cyclicBarrier)).start();
        }
        //CyclicBarrier 可以重复利用，
        // 这个是CountDownLatch做不到的
//        for (int i = 11; i < 16; i++) {
//            new Thread(new readNum(i,cyclicBarrier)).start();
//        }
    }
    static class readNum  implements Runnable{
        private int id;
        private CyclicBarrier cyc;
        public readNum(int id,CyclicBarrier cyc){
            this.id = id;
            this.cyc = cyc;
        }
        @Override
        public void run() {
            synchronized (this){
                System.out.println("id:"+id);
                try {
                    cyc.await();
                    System.out.println("线程组任务" + id + "结束，其他任务继续");
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
    }
}