Intersection and union of ArrayLists in Java

Question

Are there any methods to do so? I was looking but couldn\'t find any.

Another question: I need these methods so I can filter files. Some are AND filter

Answer 1

Final solution:

//all sorted items from both
public  List getListReunion(List list1, List list2) {
    Set set = new HashSet();
    set.addAll(list1);
    set.addAll(list2);
    return new ArrayList(set);
}

//common items from both
public  List getListIntersection(List list1, List list2) {
    list1.retainAll(list2);
    return list1;
}

//common items from list1 not present in list2
public  List getListDifference(List list1, List list2) {
    list1.removeAll(list2);
    return list1;
}