Java多线程正确使用倒计时协调器CountDownLatch方法详解

//构造器，定义计数器的初始值
public CountDownLatch(int count)：
//阻塞式等待
public void await()
//超时自动唤醒式等待
public boolean await(long timeout, TimeUnit unit)
//计数器减1，若此时计数器为0，则等待的那些线程会被唤醒
public void countDown()
//获取当前计数器的值
public long getCount()

public class MaiCaiThread implements Runnable{
    private CountDownLatch countDownLatch;
    public MaiCaiThread(CountDownLatch countDownLatch) {
        this.countDownLatch = countDownLatch;
    }
    @Override
    public void run() {
        try {
            TimeUnit.SECONDS.sleep(5);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println("出门买菜回来了");
        countDownLatch.countDown();
    }
}

public class ZuoFanThread implements Runnable{
    private CountDownLatch countDownLatch;
    public ZuoFanThread(CountDownLatch countDownLatch) {
        this.countDownLatch = countDownLatch;
    }
    @Override
    public void run() {
        try {
            TimeUnit.SECONDS.sleep(5);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println("饭做好了");
        countDownLatch.countDown();
    }
}

public class Main {
    static CountDownLatch countDownLatch = new CountDownLatch(2);
    public static void main(String[] args) throws InterruptedException {
        Thread maicai = new Thread(new MaiCaiThread(countDownLatch));
        maicai.start();
        Thread zuoFanThread = new Thread(new ZuoFanThread(countDownLatch));
        zuoFanThread.start();
        System.out.println("我想吃饭了，但是饭还没做好");
        countDownLatch.await();
        System.out.println("程序结束，我吃上饭了");
    }
}