chen-w
8/7/2017 - 10:40 PM

collections

collections

// sort
Collections.sort(List, Comparator);

e.g.
http://www.dreamsyssoft.com/java-8-lambda-tutorial/comparator-tutorial.php

old way:
Collections.sort(users, new Comparator<User>() {
    public int compare(User u1, User u2) {
      return u1.id.compareTo(u2.id);
    }
});

new way in java8:
Collections.sort(users, (User u1, User u2) -> u1.id.compareTo(u2.id));