public override void Delete(Depositor depositor)
{
if (observers.Contains(depositor))
{
observers.Remove(depositor);
}
}
public abstract void Delete(Depositor depositor);
public override void Add(Depositor depositor)
{
observers.Add(depositor);
}
/// <summary> /// 增加 /// </summary> /// <param name="depositor"></param> public abstract void Add(Depositor depositor);