public class UpdateThread extends Thread
{
    prodcon prnt;

    UpdateThread(prodcon myprnt)
    {
	prnt=myprnt;
    }

    public void run()
    {
 	while (true)
	{
	    prnt.repaint();
	    try
	    {
	        sleep(100);
	    }catch (Exception e)
	    { return; }
	}
    }
}