java8 Lambda表达式排序list集合

List<User> fus=query.asList();

Comparator<User> comparator = (User u1,User u2) -> u1.getInviteFVipNum().compareTo(u2.getInviteFVipNum());
//人数倒序
fus.sort(comparator.reversed());

 //人数正序
fus.sort(comparator);