public void Attach(ITelephoneObserver observer)
{
_observers.Add(observer);
}
public void Detatch(ITelephoneObserver observer)
{
_observers.Remove(observer);
}
public TeleTubbie(ITelephoneObserver teleTubbies, TelephoneSubject telephone)
{
_teleTubbies = teleTubbies;
telephone.Attach(_teleTubbies);
}