1 两种方法生成多线程

1.  直接继承Thread
2. new Thread(new Runnable(){})

package Test;/* * start代表启动一个线程，不然run方法只是属于main线程的一部分 * new Thread(new Runnable(){public void run(){}}){public void run(){}}.start(); * 上面这个不会调用runnable的run方法，因为被覆盖了 * */public class TheadUsage {public static void main(String[] args){//Run();   // 结果可能是0110，0先睡不代表0能先抢到cpuuseThread();}public static void Run(){new Thread(new Runnable(){public void run() {System.out.println(Thread.currentThread().getName());try {Thread.sleep(1000);} catch (InterruptedException e) {e.printStackTrace();}System.out.println(Thread.currentThread().getName());}}).start();new Thread(new Runnable(){public void run(){System.out.println(Thread.currentThread().getName());try{Thread.sleep(1000);}catch(InterruptedException e){e.printStackTrace();}System.out.println(Thread.currentThread().getName());}}).start();}/* * start还是会调用run方法的，如果run方法覆盖了，就调用覆盖的。不然源代码如下 * public void run() {if (target != null) {    target.run();}   } *  * */public static void useThread(){ThreadUsage t1 = new ThreadUsage();ThreadUsage t2 = new ThreadUsage();t1.start(); // 结果都是不定的t2.start();}}class ThreadUsage extends Thread{public void run(){System.out.println(Thread.currentThread().getName());try{Thread.sleep(1000);}catch(InterruptedException e){e.printStackTrace();}System.out.println(Thread.currentThread().getName());}}