Re: Query:multithread about java

From:

Lew <lew@nospam.lewscanon.com>

Newsgroups:

comp.lang.java.programmer

Date:

Thu, 03 May 2007 11:37:55 -0400

Message-ID:

<IvmdnY9t6fVJnKfbnZ2dnUVZ_jydnZ2d@comcast.com>

Jack Dowson wrote:

There are two Demos using different way to creat a thread,one is by
inheriting class Thread while another is by implementing interface
Runnable,but the results of these two examples are quite different.

Demo1:
class MultiThread4 implements Runnable{
    private int ticket = 100;
    public void run(){
        while(ticket>0)
            System.out.println(ticket-- +"is saled by " +
Thread.currentThread().getName());
            }
    }
class MultiThreadDemo4{
    public static void main(String[] name){
        MultiThread4 m =new MultiThread4();
        Thread t1 = new Thread(m,"Window 1");
        Thread t2 = new Thread(m,"Window 2");
        Thread t3 = new Thread(m,"Window 3");
        t1.start();
        t2.start();
        t3.start();
        }
    }

Your Runnable example reuses the same Runnable object for all threads. Your
Thread example did not do that.

Try this instead:

  class MultiThreadDemo4
  {
   public static void main(String[] name)
   {
     Thread t1 = new Thread( new MultiThread4(), "Window 1" );
     Thread t2 = new Thread( new MultiThread4(), "Window 2" );
     Thread t3 = new Thread( new MultiThread4(), "Window 3" );
     t1.start();
     t2.start();
     t3.start();
   }
  }

--
Lew