作业1

package com.day18;

public class Demo01 {
    public static void main(String[] args) {
        //创建线程对象
        Mythread thread1 = new Mythread();
        Mythread thread2 = new Mythread();
        //启动线程
        thread2.start();
        thread1.start();
    }
}
//使用继承Thread类的方式创建线程
class Mythread extends Thread{
    public void run(){
        for(int i=1;i<=20;i++){
            System.out.println(i+".你好，来自线程"+Thread.currentThread().getName());
        }
    }
}