How do  I use a variable from an Interface class?

Right now I have three classes. First class is called Game and it extends my second class call Parent and also implements my third class call Source. Source is an interface class. I have a variable that I want to use in my Source class named Checker. Now, How do I go among using that variable from my Game class? What should the code look like?
ex.
public class Game extends Parent implements Source
need help badly....

ok, what I forgot to tell you guys is that my variable
in my interface class is a boolean type(true or
false). It is set to true now. But I want it to change
to false when a user triggers a button in the Game
class. How do I do this? You don't because you can't. If you have a varaible declared in an interface it must be static and final. It cannot, therefore, be changed. Better head back to the drawing board.

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