Does system classloader load all classes in classpath even if they're not actually used?

No, The ClassLoader loads the class when the class is needed in memory. It doesn't load all classes at once as it can run out of memory.

They are loaded when needed. But what "when needed" means, might depend on the classloader. Typically, when a class is loaded it also checks the existence of all classes it references - and it might also load them.

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.