class Thread1 extends Thread {  //̳Thread
	public void run() {
		System.out.println("1");
		System.out.println("2");
	}
}
class Thread2 implements Runnable{  //ʵRunnableӿ
	public void run(){
		System.out.println("3");
		System.out.println("4");
	}
}
public class ThreadTest1{
	public static void main(String argv[]){		
		Thread1 obj1 = new Thread1();
		Thread2 obj2 = new Thread2();
		Thread t1 = new Thread(obj1);     //߳
		Thread t2 = new Thread(obj2);		
		t1.start();                       //߳
		t2.start();
	}
}
