How to receive difference of maps in java?

Question

I have two maps:

Map map1;
Map map2;

I need to receive difference between these maps. Does exist ma

Answer 1

    Set> diff = new HashSet>((map1.entrySet()));
    diff.addAll(map2.entrySet());//Union
    Set> tmp = new HashSet>((map1.entrySet()));
    tmp.retainAll(map2.entrySet());//Intersection
    diff.removeAll(tmp);//Diff