List difference in java

Question

I have two ArrayList<Integer> as follows:

original: 12, 16, 17, 19, 101

selected: 16, 19, 107, 108, 109

I want to do difference on these lists such that in the end I have two lists:

Add: 108,109,107

remove: 12, 17, 101

Length of original and selected lists varies and one can be greater/smaller than the other

Answer 1

As an alternative, you could use CollectionUtils from Apache commons library. It has static intersection, union and subtract methods suitable for your case.