Discussions

You have the BottomSensor class extending the Player class. So, when you create a BottomSensor object, you have the Player class constructor creating another one, and another one and so on. -- until your either you run out of memory or the stack overflows (whichever occurs first, which in your case was the stack overflow). A BottomSensor object is not a player and therefore its class should not extend the Player class -- it should extend the Actor class.

IIt's just the package classes that I'm not used to I think.

Do you have anything so far, or you want me to create the whole scenario? It will be easier to work on classes that you already have (and shown with code-tags). If you don't have anything at all then you should read this.

Is there a way to send a simple command to the other actors?

Do you guys have any recommendations on how to fix my fixPlacement method? Or should I try something else entirely to prevent the buttons from overlapping each other?

In your MyWorld class change line 8 to: addObject(healthbar, 50, 10);

Sorry for all the trouble - my fault.

i took your advise anyway and i worked thanks!