Multi-threaded bouncing balls, issue displaying balls?

It seems your ball extends jpanel and has a paint method, but your ballPanel would need to do the painting and your ball doesn't really seem to need to be a panel at all.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.