public void quack() {
Iterator iterator = ducks.iterator();
while (iterator.hasNext()) {
Quackable duck = (Quackable) iterator.next();
duck.quack();
}
}
public void registerObserver(Observer observer) {
Iterator iterator = ducks.iterator();
while (iterator.hasNext()) {
Quackable duck = (Quackable) iterator.next();
duck.registerObserver(observer);
}
}
void simulate(Quackable duck) {
duck.quack();
}
public String toString() {
return duck.toString();
}
public void quack() {
duck.quack();
numberOfQuacks++;
}
public void notifyObservers() {
duck.notifyObservers();
}
public void registerObserver(Observer observer) {
duck.registerObserver(observer);
}
