Simple way to compare 2 ArrayLists

Question

I have 2 arraylists of string object.

List sourceList = new ArrayList();
List destinationList = new ArrayList

        

Answer 1

List oldList = Arrays.asList("a", "b", "c", "d", "e", "f");
List modifiedList = Arrays.asList("a", "b", "c", "d", "e", "g");

List added = new HashSet<>(modifiedList);
List removed = new HashSet<>(oldList);

modifiedList.stream().filter(removed::remove).forEach(added::remove);

// added items
System.out.println(added);
// removed items
System.out.println(removed);