How to sort ArrayList with two properties?

Question

I have an Arraylist and I want to sort ArrayList by two properties 1.By Name(Alphabetical Order) 2.By a custom Key

More Explanation -:

ArrayList<User> list = new ArrayList();

Collections.sort(list, new Comparator<User>() {
        @Override
        public int compare(User user, User t1) {
        1.By User.getName() (Alphabetically)
        2.By User.getRelationshipState() (Custom property)


});

`

What do you mean by "custom Key"? Do you want to change the key to sort for everytime you sort? Or is this just some field of the `User` class? — bkis, Jan 25 '18 at 16:46
Custom key like user.getRelationshipState which is public final static int REQNOTSENT =0; public final static int REQUESTSENT =1; public final static int FRIENDS=2; public final static int REQUESTRCVED =3; I want to sort like Friends REQUESTSENT REQUESTRCVED REQNOTSENT — Shahzeb, Jan 25 '18 at 16:47

score 1 · Answer 1 · edited Jan 25 '18 at 18:57

1

Your object need to implement the Comparable interface.

See javadoc

edited Jan 25 '18 at 18:57

melwil

2,547
1
19
34

answered Jan 25 '18 at 16:44

Antoine Dubuis

4,974
1
15
29

1

Kindly Can you explain this litter bit pls? – Shahzeb Jan 25 '18 at 16:45
1

This doesn't even sounds like a potential comment. – Suresh Atta Jan 25 '18 at 16:45
Sorry, but this won't take him further than what he already tried with the Comparator. – bkis Jan 25 '18 at 16:47

How to sort ArrayList with two properties?

1 Answers1