Java: How to show Hello World! after button has been clicked?

First, find a swing tutorial that fits you. There are many, such as this and this (first on google...).

There are many options, but in this case you might look to use a CardLayout.

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.