difference method
override
Returns a new set with the elements of this that are not in other
.
That is, the returned set contains all the elements of this Set that
are not elements of other
according to other.contains
.
Implementation
Set<E> difference(Set<Object> other) {
Set<E> result = toSet();
for (E element in this) {
if (other.contains(element)) result.remove(element);
}
return result;
}