线程休眠2

package com.wuming.state;

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

//模拟倒计时
public class TestSleep2 {
    public static void main(String[] args) {
  /*      try {
            tenDown();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }*/

/*        10
        9
        8
        7
        6
        5
        4
        3
        2
        1*/

        //打印当前系统时间
        Date startTime = 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(startTime));
                startTime=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;
            }
        }
    }
}

22:43:34
22:43:35
22:43:36
22:43:37
22:43:38
22:43:39
22:43:40

。。。。。