利用多线程sleep实现时间的打印

package com.ljy.test;

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

public class TestTime1 {
    public static void main(String[] args) {
        Date date=new Date(System.currentTimeMillis());
        while (true){
            try {
                Thread.sleep(1000);
                System.out.println(new SimpleDateFormat("HH:mm:ss").format(date));
                date=new Date(System.currentTimeMillis());
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}