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Well, morning guys.... Happy to see that you atleast got some point to see Java's strength :) Good Luck and if you got any problem, let us know.

Totally wrong. It's actually that you didn't properly learn it or use it.

Well, we don't know what is your application's design, what do you want to do....
But if you want to call a function from other class, we've just told you. We don't know the very logic of your...

You must look how to call the methods of other class. Well, PersonEinfuegen() is not a static method so you must call it from some object which is actually referencing Liste.

Where is your code?

You want to access Class B methods in Class A? If it's so, you must look into if Class B is visible to Class A, if it's visible, create an instance and use it's methods wherever you want(but only if...