package headfirst.combining.observer;public class GooseAdapter implements Quackable {	Goose goose;	Observable observable;	public GooseAdapter(Goose goose) {		this.goose = goose;		observable = new Observable(this);	} 	public void quack() {		goose.honk();		notifyObservers();	}	public void registerObserver(Observer observer) {		observable.registerObserver(observer);	}	public void notifyObservers() {		observable.notifyObservers();	}	public String toString() {		return "Goose pretending to be a Duck";	}}