@Override
public E getRandom() {
// long random = Math.round(Math.random() * setList.size());
setList.goToFirst();
// for(long i = 1; i < random; i++) {
// setList.goToNext();
// }
return setList.retrieve();
}
@Override
public Set<E> intersection(Set<E> S) {
Set<E> intersection = new Set<E>();
if (!setList.goToFirst()) return intersection;
if (S.setList.isEmpty()) return intersection;
do {
E el = setList.retrieve();
if (S.setList.find(el)) {
intersection.addElement(el);
}
} while (setList.goToNext());
return intersection;
}
@Override
public Set<E> difference(Set<E> S) {
if (!setList.goToFirst()) return this;
if (S.isEmpty()) return this;
Set<E> difference = new Set<E>();
do {
E el = setList.retrieve();
if (!S.setList.find(el)) {
difference.addElement(el);
}
} while (setList.goToNext());
return difference;
}