How do I remove an old JPanel and add a new one?

SetVisible(false), even in the correct place, will not actually remove the panel from the container. If you want to replace the panel do this.

Don't forget or overlook the approach of using the Layout, namely the CardLayout as the Frames Layout, to allow this type of behavior (This is a good strategy for a "Wizard" for example). One advantage to this is it doesn't cause any weird flash or draw effects as that is what this Layout is meant to do--Allow a panels to be swapped out, assuming they have exclusive "real estate" or can share the same areas (i.e. "Wizard" like behavior.).

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.