//线程
public class test102 extends Thread{public void run(){while (true){System.out.println("我是线程1"+this.getName());try {Thread.sleep( 1000 );}catch (InterruptedException e){e.printStackTrace();}}}
}

//线程
public class test103 extends Thread{public void run(){while (true){System.out.println("我是线程2"+this.getName());try {Thread.sleep( 1000 );}catch (InterruptedException e){e.printStackTrace();}}}
}

测试类

public class test104 {public static void main(String[] args){test102 one=new test102();test103 two=new test103();one.start();two.start();System.out.println( "我是主方法" );}
}

运行结果