How to sort ArrayList with two properties? [duplicate]

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
– bkis, Commented Jan 25, 2018 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
– Shahzeb, Commented Jan 25, 2018 at 16:47

melwil · Accepted Answer · 2018-01-25 18:57:11Z

1

Your object need to implement the Comparable interface.

See javadoc

edited Jan 25, 2018 at 18:57

melwil

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answered Jan 25, 2018 at 16:44

Antoine Dubuis

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3 Comments

Shahzeb Over a year ago

Kindly Can you explain this litter bit pls?

Suresh Atta Over a year ago

This doesn't even sounds like a potential comment.

bkis Over a year ago

Sorry, but this won't take him further than what he already tried with the Comparator.

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