🚀 go-pugleaf

jinxiaojin wrote:

> 
> I wrote follow codes,and found this thread only run once
> I hope this thread run twice,and i think the program will print:
> Thread is running
> Thread exit
> Thread is running
> Thread exit
> 
> In fact ,it is :
> Thread is running
> Thread exit
> 
> 
> 
> 
> public class ThreadTest2 {
>     MyThread mythread;
>     /** Creates a new instance of ThreadTest2 */
>     public ThreadTest2() {
>         mythread = new MyThread();
>         test();
>     }
>     
>     private void test() {
>         mythread.start();
>         try {
>             Thread.sleep(1000l);// mythread has finish his job
>         }
>         catch(Exception ex) {
>             ex.printStackTrace();
>         }
>         mythread.start();
>     }

Hint: rather than mythread.start, try calling mythread.run. 

Explanation: You are not overridding start(), you are overridding run(). If
you override start() in the MyThread class, then calling start() would work
as you are wishing it would.

Example:

public MyThread() {

}
 
 public void run() {
  System.out.println("Thread is running.");
  System.out.println("Thread exit.");
 }
 
 public void start() {
   run();
 }
}


of course, another way to do this, without overridding stop() in the
MyThread class, is to call run() instead of start() in the test() method of
TestThread2.

Example:

     private void test() {
         mythread.start();
          try {
           Thread.sleep(1000l);// mythread has finish his job
         }
         catch(Exception ex) {
             ex.printStackTrace();
         }
         mythread.start();
    }


If you intend to use Threads to any extent, I highly suggest you read up on
the new thread standards. Quite a few methods have been changed and/or
deprecated due to thread safe concerns in the latest jdks.