线程状态-线程休眠 sleep

import java.text.SimpleDateFormat;
import java.util.Date;

//模拟网络延时
public class TestSleep {


    public static void main(String[] args) {

        //打印当前系统时间
        Date starTime = new Date(System.currentTimeMillis());//获取系统当前时间

        while (true){
            try {
                Thread.sleep(1000);
                System.out.println(new SimpleDateFormat("HH:mm:ss").format(starTime));
                starTime = new Date(System.currentTimeMillis());//更新当前时间
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }


    }





    //模拟倒计时
    public static void tenDown() throws InterruptedException {
        int num = 10;

        while(true){
            Thread.sleep(1000);
            System.out.println(num--);
            if (num<=0){
                break;
            }
        }
    }


}