java 多线程

package com.webank.ai.fate.serving;

import java.text.SimpleDateFormat;
import java.util.*;

public class MyDemo extends Thread {
    @Override
    public void run() {

        SimpleDateFormat strf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//设置日期格式
        String curTime = strf.format(new Date());
        System.out.println(curTime);
    }

    public static void main(String[] args)  {
        MyDemo myDemo =new MyDemo();
        List<Thread> list = new ArrayList<>();
        for (int i = 0; i <5 ; i++) {

            Thread th =new Thread(myDemo);
            th.start();
            list.add(th);
        }
        for (int j = 0; j<list.size() ; j++) {
            try {
                list.get(j).join();
            }catch (Exception e){
                e.printStackTrace();
            }

        }

    }

}