Java Thread 2

package com.jue.test;public class MainClass {    /**     * @param args     */    public static void main(String[] args) {        // TODO Auto-generated method stub        Thread t1 = new MyThread();        t1.start();                try{ Thread.sleep(2000);}catch(Exception e){}        t1.start();    }        static class MyThread extends Thread{        @Override        public void run() {            System.out.println("MyThread->run");        }    }}

結果:

MyThread->run
Exception in thread "main" java.lang.IllegalThreadStateException
at java.lang.Thread.start(Thread.java:612)
at com.jue.test.MainClass.main(MainClass.java:15)