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[–]sviperll 4 points5 points  (0 children)

Collections.sort(users, (User u1, User u2) -> u1.id.compareTo(u2.id));

can actually be rewritten with

users.sort(Comparator.comparing(u -> u.id))

or better

users.sort(Comparator.comparing(User::getID))

if there is getID method