Java并发编程CountDownLatch的使用2

淡淡的烟草味﹌ 2022-06-14 22:12 140阅读 0赞

代码部分

import java.util.concurrent.CountDownLatch;
    
    public class CountDownLatchTest {
        public static void main(String[] args) {
            final CountDownLatch countDown = new CountDownLatch(2);
            Thread t1 = new Thread(){
                @Override
                public void run() {
                    try {
                        System.out.println("当前线程t1：初始化完成");
                        countDown.await();
                        System.out.println("当前线程t1：继续执行");
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    } 
                }
            };
            Thread t2 = new Thread(){
                @Override
                public void run() {
                    try {
                        System.out.println("当前线程t2：初始化完成");
                        Thread.sleep(3000);
                        System.out.println("当前线程t2：通知t1继续执行");
                        countDown.countDown();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            };
            Thread t3 = new Thread(){
                @Override
                public void run() {
                    try {
                        System.out.println("当前线程t3：初始化完成");
                        Thread.sleep(3000);
                        System.out.println("当前线程t3：通知t1继续执行");
                        countDown.countDown();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            };
            t1.start();
            t2.start();
            t3.start();
        }
    }

运行结果

当前线程t1：初始化完成
    当前线程t3：初始化完成
    当前线程t2：初始化完成
    当前线程t2：通知t1继续执行
    当前线程t3：通知t1继续执行
    当前线程t1：继续执行