1 public class ThreadA extends Thread { 2     private static int threadID = 0; 3  4     public ThreadA() { 5         super("ThreadID:" + (++threadID)); 6     } 7  8     public void run() { 9         try {10             System.out.println(getName() + " 线程运行开始!");11             for (int i = 0; i < 10; i++) {12                 System.out.println(this.getName() + " is " + i);13 14                 Thread.sleep(1);//这里要sleep，不然看不出多线程的效果15             }16         } catch (Exception e) {17             e.printStackTrace();18         }19     }20 21 }

public class MyTest {    public static void main(String[] args){        ThreadA t1=new ThreadA();        ThreadA t2=new ThreadA();        t1.start();        t2.start();    }}