/**
* @param set
* @return
*/
public boolean equals(final Set<T> set) {
return cardinality() == set.cardinality() && elements.containsAll(set.elements);
}
/**
* @param set
* @return
*/
public boolean subset(final Set<T> set) {
return cardinality() <= set.cardinality() && set.elements.containsAll(elements);
}
