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

Question

List listA = new ArrayList();
listA.add(\"a\");
listA.add(\"b\");
listA.add(\"c\");
listA.add(\"d\");



List listB = new A         


        

Answer 1

listB.removeAll(listA)

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