- private WorldNavigationUserInputTracker defaultInputHandler = new WorldNavigationUserInputTracker();
- private Stack<UserInputHandler> inputHandlers = new Stack<>();
- private UserInputHandler currentUserInputHandler;
+ private final WorldNavigationUserInputTracker defaultInputHandler = new WorldNavigationUserInputTracker();
+ private final Stack<KeyboardInputHandler> inputHandlers = new Stack<>();
+ private KeyboardInputHandler currentUserInputHandler;