public void RegisterObserver(IObserver observer)
{
DuckIterator iterator = new DuckIterator(ducks);
while (iterator.HasNext())
{
IQuackable duck = (IQuackable)iterator.Next();
duck.RegisterObserver(observer);
}
}
public void NotifyObservers()
{
DuckIterator iterator = new DuckIterator(observers);
while (iterator.HasNext())
{
IObserver observer = (IObserver)iterator.Next();
observer.Update(duck);
}
}
public void Quack()
{
DuckIterator iterator = new DuckIterator(ducks);
while (iterator.HasNext())
{
IQuackable quacker = (IQuackable)iterator.Next();
quacker.Quack();
}
}