public override bool RemoveAll(ICollection <E> collection)
{
bool result = false;
if (Count <= collection.Count)
{
IIterator <E> it = Iterator();
while (it.HasNext())
{
if (collection.Contains(it.Next()))
{
it.Remove();
result = true;
}
}
}
else
{
foreach (E e in collection)
{
result = Remove(e) || result;
}
}
return(result);
}