public override void Add(Depositor depositor)
{
if (!observerList.Contains(depositor))
{
observerList.Add(depositor);
}
}
public override void Remove(Depositor depositor)
{
if (observerList.Contains(depositor))
{
observerList.Remove(depositor);
}
}
public abstract void Remove(Depositor depositor);
public abstract void Add(Depositor depositor);