Java并发编程CountDownLatch的使用2

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