java多线程编程--CyclicBarrier和CountDownLatch的区别

java多线程编程--CyclicBarrier和CountDownLatch的区别 CyclicBarrier和CountDownLatch区别：

CyclicBarrier没有可以专门计数的计数器，只有通过awai()方法计算被阻塞的线程数是否到达！

案例

CountDownLatch

package com.example.dtest.threadTest.use.countDownDifferCyclicBarrier;

import java.util.concurrent.CountDownLatch;

public class CountDownLatchTest {

    public static void main(String[] args) {

        CountDownLatch countDownLatch = new CountDownLatch(5);
        for(int i = 0; i < 5; i++){
            new Thread(new ReadNum(i,countDownLatch)).start();
        }
        try {
            countDownLatch.await();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        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");
            }

        }
    }

}

CyclicBarrier

package com.example.dtest.threadTest.use.countDownDifferCyclicBarrier;

import java.util.concurrent.BrokenBarrierException;
import java.util.concurrent.CyclicBarrier;

public class CyclicBarrierTest {

    public static void main(String[] args) {

        CyclicBarrier cyclicBarrier = new CyclicBarrier(2,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();
        }

    }

    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 (InterruptedException e) {
                    e.printStackTrace();
                } catch (BrokenBarrierException e) {
                    e.printStackTrace();
                }

            }

        }
    }


}