线程休眠

sleep（时间）指定当前线程阻塞的毫秒数
sleep存在异常InterruptedException
sleep时间达到后，进入线程就绪状态
sleep可以模拟网络延迟，倒计时等
每一个对象都有一个锁，sleep不会释放锁

//模拟网络延迟
//作用：放大问题
public class TestSleep implements Runnable{
    //票数
    private int ticknetNum = 10;
    @Override
    public void run() {
        while (true) {
            if(ticknetNum <= 0) {
                break;
            }
            //模拟延迟
            try {
                Thread.sleep(200);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println(Thread.currentThread().getName() + "--->拿到了第" + ticknetNum-- + "票");
        }
    }

    public static void main(String[] args) {
        TestSleep ticket = new TestSleep();


        new Thread(ticket,"小米").start();
        new Thread(ticket,"老师").start();
        new Thread(ticket,"黄牛").start();
    }
}

//模拟倒计时
public class TestSleep2 {
    public static void main(String[] args) {

        //打印当前系统时间
        Date starttime = new Date(System.currentTimeMillis());//获取当前系统时间
        while (true){
            try {
                Thread.sleep(1000);
                System.out.println(new SimpleDateFormat("HH:mm:ss").format(starttime));//使用时间格式化工厂
                starttime = new Date(System.currentTimeMillis());//刷新时间
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }

    }
//模拟倒计时
    public void turnDown() {
        int num = 10;
        while (true) {
            try {
                Thread.sleep(1000);
                System.out.println(num--);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            if (num <= 0) {
                break;
            }
        }
    }
}

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线程休眠

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