[Java] Google Sets 클래스를 이용한 집합 구하기

HashSet<String> savedList = getSavedList();
HashSet<String> currentList = getCurrentList();

//대칭차
SetView<String> setView = Sets.symmetricDifference(savedList, currentList);

//교집합
Set<String> retainList = Sets.intersection(currentList, setView);

//차집합
Set<String> difference = Sets.difference(currentList, setView);

//합집합
Set<String> union = Sets.union(currentList, setView);




for(String item : union) {
	System.out.println(item);
}