How do you remove the overlapping contents of one List from another List?

Question

List<String> listA = new ArrayList<String>();
listA.add("a");
listA.add("b");
listA.add("c");
listA.add("d");



List<String> listB = new ArrayList<String>();
listB.add("c");
listB.add("d");
listB.add("e");
listB.add("f");

ListB contains two elements that are also present in ListA ("c" and "d").

Is there a clean way to make sure that listB does not contain these or any other overlapping elements that may already exist in listA?

Answer 1

listB.removeAll(listA)

This would make your listB contain only [e, f].