Terminate thread when frame closes

I made a JFrame which runs a thread, but when I close the frame it goes on running... I can't stop it unless I ctrl-alt-del.. How do I terminate it? I start it by calling start(), should I use run() instead?

(I'm scared to try since it f***s my pc up, so I would rather ask a knowledgeable person first) here's the related part of the code:

publicvoid run(){

Thread.currentThread().setPriority(Thread.MAX_PRIORITY);

while(true){

player.playerMove();

// repaint

repaint();

// end of while

try

{

Thread.sleep (speed);

}

catch (InterruptedException ex)

{

// do nothing

}

Thread.currentThread().setPriority(Thread.MAX_PRIORITY);

}

}

publicvoid start(){

Thread th =new Thread(this);

th.start();

}

Message was edited by:

nayon_7

[1570 byte] By [nayon_7a] at [2007-11-27 7:33:15]