Applet ball not moving

[riscoh]

The problem seems to be that my run() never runs, but I just don't understand why?

run method on the Ball class doesnt get called because you instantiante the class like this Ball ball = new Ball(Xmax, Ymax);

Since it implements the runnable interface you can do somthing like this
Ball ball = new Ball(Xmax, Ymax)
Thread ballThread= new Thread(ball);
now to move the ball just invoke the start method of the ballThread
ballThread.start();
And to keep your ball moving you need a while loop inside the Ball run method to keep updating the ball's x and y coordinates

Or just try editing the Ball constructor

// just T1 to null;
Thread T1 = null;

public Ball(int a, int b)
	{
		Xmax = a;
		Ymax = b;
		x = Xmax/2;
		y = Ymax/2;
		P1.setPaddle(5, (Ymax/2));
		P2.setPaddle((Xmax-5), (Ymax/2));
		T1 = new Thread(this);
                T1.start();
	}

But this might not be a good idea coz.... the ball is already moving even before your applet is being started.......... I think?