//接口------推荐public class Test {	public static void main(String[] args) {				Runner1 r = new Runner1();		//r.run();------->不是多线程，只是方法调用		Thread t = new Thread(r);		t.start();//必须调用线程类的start()方法				 //也可以这样：		 //new　Thread(new Runner1()).start();		 						for(int i = 0; i < 100; i++) {			System.out.println("Main Thread:=========" + i);		}	}}class Runner1 implements Runnable {	public void run() {		for(int i = 0; i < 100; i++) {			System.out.println("Runner1 :" + i);		}	}}

//继承-----不推荐public class Test {	public static void main(String[] args) {		Runner1 r = new Runner1();		r.start();				for(int i = 0; i < 100; i++) {			System.out.println("Main Thread:=========" + i);		}	}}class Runner1  extends Thread {	public void run() {		for(int i = 0; i < 100; i++) {			System.out.println("Runner1 :" + i);		}	}}