Question

How can I use tailSet() and headSet() for a NavigableSet<MyType>? And also implement own rules which elements would qualify for a tailset or headset?

Like:

class MyType {
  String name;
  String number;
}

Now if I have a type(“daniel”, “12”), I want to have all elements which are alphabetically before daniel, and number > 12. This would be my headset. The opposite would be the tailset.
(of course the comparisions do not make any sense, but you get what I’m trying to do).

Answer 1

Either let MyType implement Comparable or use a NavigableSet which let you provide a separate Comparator like TreeSet.