First thing that comes to mind is to encapsulate the count integer in a custom class/object. If you then make it 'observable' and you let all objects that need to know about the changes to the count integer, register themselves to this object, you're pretty close to what you're looking for.
Read up on the Observer pattern (on the net or in a book like Head First Design Patterns). It'll give you some more detail on how to implement this.
Cheers,
Wim
Yes, I have implemented Observer and Observable feature now. I created two inner classes Count and CountObserver:
Now when any event that makes change to count, I call
. This way, I can make the right changes to nextQuestion and previousQuestion (as in when to be disabled/enabled). I did a run, and it works fine. Thank you so much.