Thread(1)
代码小例子：

package com.test;public class ThreadTest{public static void main(String[] args){Thread1 t = new Thread1();Thread2 t2 = new Thread2();t.start();t2.start();}}class Thread1 extends Thread{@Overridepublic void run(){for (int i = 0; i < 100; i++){System.out.println("welcome:" + i);}}}class Thread2 extends Thread{@Overridepublic void run(){for (int i = 0; i < 100; i++){System.out.println("hello world:" + i);}}}