Access from class B to A with Listener

Question

https://code.sololearn.com/c6AicfkMc7v2/?ref=app

If a class like B in the example Code has implemented a Listener(e.g. MouseListener)
and in class A is an Instance from B, how can I call a Method from A with the implementation of the Method in class B.
The example Code makes it clearer what I mean.

I have read about a callback function to do this.
Are there more ways to do this or is that a general design failure from me?

Answer 1

Why dont you just make void hello static and call A.hello() in the aListener method

Answer 2

Do you want to change the implementation in B based on the listener?

Answer 3

Lord HN cool idea but nope 😆
Let us say that the Listener is a MouseListener and the overriden method is mouseClicked or something similar.
Now the Listener triggers and the method mouseClicked is called.
And this method calls the method from A.
I hope it's now more clear. 😅