// the controller listens to the view and interprets a button click
// with a call to incStatus() of its model 

class Controller implements IViewListener {

    Model model; 
    View view; 

    Controller(Model m, View v) { 
	model = m; 
	view = v; 
    }

    // report event with model and create next view 
    public void notifyListener() {
	model.incStatus(); 
    }
}