Sorting a list with integers android

Question

Should I use the comparable or comparator when I want to sort my list based on my own personal object? should I use the collection operation in my recycler view adapter?

Possible duplicate of [Sort listview with array adapter](http://stackoverflow.com/questions/9906464/sort-listview-with-array-adapter) — OneCricketeer, Dec 22 '15 at 18:24
have you tried using [Google search](https://www.google.de/?gws_rd=ssl#q=how+to+sort+an+arraylist+in+java)? — Droidman, Dec 22 '15 at 18:33
yes I tried. nevermind. I just needed an example. I cant delete this post anyway. — Eran, Dec 22 '15 at 18:35

score 2 · Answer 1 · answered Dec 22 '15 at 18:26

2

Is it a list of integers (as you specify in your title)?

you can use Arrays#sort

Arrays.sort(someArray, new Comparable<Integer>() {
    public int compare(Integer a, Integer b) {
        return a.compareTo(b);
    }
});

answered Dec 22 '15 at 18:26

Tyler Sebastian

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you don't need a `Comparator` (not a Comparable either) to sort integers. – njzk2 Dec 22 '15 at 18:28
also, it seems you are confusing array with list. – njzk2 Dec 22 '15 at 18:29
well basically I have also text, but I want to sort the list by the integers that I have. ive seen this code you posted but I didn't know where should I use it.. – Eran Dec 22 '15 at 18:29
When you add items to your adapter, add them to the stored list and re-sort it. – Tyler Sebastian Dec 22 '15 at 18:41

score 2 · Answer 2 · answered Dec 22 '15 at 18:29

If it's just a list of integers, and they are in for instance a List object, you don't have to use a comparator, unless you need to parse the integers as something other than plain numbers.

Collections.sort(myList);

If it's one of your own objects, look at Tyler Sebastians answer. Collections comes with a similar method for lists.

Collections.sort(myList, new MyComparator());

Sorting a list with integers android

2 Answers2