Create a sorted Set while using streams

Question

I have a User class with name, type and age and then a long list of these users are my input List users = db.getUsers();<

Answer 1

Here's one way of doing it assuming you have equals and hashcode methods implemented in the User class properly.

Set uniqueUsers = new HashSet<>(users);
Set sortedUniqueUsers = uniqueUsers.stream()
    .sorted(Comparator.comparingInt(User::getAge))
    .collect(Collectors.toSet());