Nice game, although I think it wouldn't hurt if the ball was a little bit faster. Or make the speed adjustable.
It would also be good if you can fix the need to resize the launcher just to reveal the buttons.
I just moved the "setSize();" after the swing stuff, its now working 100% for me.
* Connect as Client
I think it will be fun if you make the ball increase in speed depending on the angle. ( I think that is how the original pong worked.
The speed is currently increasing on every contact with a paddle,
but i want to manipulate the direction of the ball depending on the position on the paddel where it collides.
How many more hours are you going to put into this?
I think i am going to put 20 hours or more into it, to make it a real nice game (better graphics, higher performance, better networking, and of course fixing every little bug)
To extend it, i am thinking of adding a list of recent servers for quick-connect, Bonus Items (in- or decrease paddle Size, gravitation,...)