How can I return the difference between two lists?

Question

I have two array lists e.g.

List a;
contains : 10/10/2014, 10/11/2016

List b;
contains : 10/10/2016

How can i do

Answer 1

Here is a generic solution for this problem.

public  List difference(List first, List second) {
    List toReturn = new ArrayList<>(first);
    toReturn.removeAll(second);
    return toReturn;
}