How to get event 'out of the class'

I have been reading myself silly about this, I either don't get it or it is very difficult.
What I want to do:
1) setup
2) show panel
3) handle input in panel
4) once valid
5) "get out"
6) display other panel.
I can go all the way to 4.
But I can't get "out" of the panel.
All I can guess/understand is that I have to trigger an event that will be handled below/outside this panel.
Has anybody some idea how to do this? Maybe a link to some example code?
There is tons to read about event handling but the (only) part I understand is about events within classes just as all the examples are (One panel two buttons, two pictures etc)
I guess the only option I might envision is dividing by zero and catching the error outside the panel.
That would be bazooking a mosquito, but it also shows what I try to implement.
I'd be so happy to understand this part of the 'java system' ...
(please understand that I don't want 'cardlayout', I want to understand what I need to do)
Much thanks for any help!

Thank you for your suggestion.
My problem is that I am (feel?) stuck within the panel.
So to put it differently, I cannot build a child panel with a button (in the child) that will have the parent pane change color. This as my 'code focus' is within the child panel and I cannot 'activate' code outside it.
I am totally confused now as to how java works.
So I cannot write a parent pane with a child pane where the child tests for a name and if the name is correct the child will be removed and some code will put in another child pane with fi a picture.
This seems so utterly basic to any programmers needs, but I cannot find one example - or I have gone blind looking for it. In my code if I want to read the input field I have to handle it within the child pane, if I want to change child panels I need to do that in the parents panel code. But I can't change the code focus. So the child needs to generate an event that the parents can act upon, but there are no examples while I actually expect tons of examples. So maybe I don't speak 'Java'.
This meaning that I cannot write a stack of panes and remove them one by one using fi the escape key.
I am just left clueless by Java.

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