removing an object from arraylist without changing the index of other objects

Question

So i need to delete a specific object under the index number of how many times my loop has passed in an arraylist.

lets say i want to delete my object that has an index 0 on arraylist

but the object on index 1 and index 2 (and so on) still need to be the same index number as before i removed index 0.

        for (int i = 0; i < 4 i++) {
            player thisPlayer = players.get(i);

            if (not important) {
                players.remove(thisPlayer);
            }
        }

if player 1 needs to be removed, the other players need to maintain the same index.

what do i do?

You could set the value at that element to null. Removing elements, except when removing from the end, will shift other elements forward, as you probably know. — Logan
– Logan, Commented Apr 17, 2016 at 20:41
You could store the elements in a Map<Integer, Player>; then you can remove arbitrary elements (and keys) without effecting other keys. — Elliott Frisch
– Elliott Frisch, Commented Apr 17, 2016 at 20:44
Is it actually important that the index remains unchanged after the loop is finished, or is it just important to make the loop work? — Stefan Dollase
– Stefan Dollase, Commented Apr 17, 2016 at 20:45
Possible duplicate of Java, Using Iterator to search an ArrayList and delete matching objects — Stefan Dollase
– Stefan Dollase, Commented Apr 17, 2016 at 20:50
i believe your best choice is to use a map as @ElliottFrisch said — Abdullah Asendar
– Abdullah Asendar, Commented Apr 17, 2016 at 20:53

Jon · Accepted Answer · 2016-04-17 21:03:24Z

6

Instead of using

players.remove(thisPlayer);

You could try something along the lines of

players.set(players.indexOf(thisPlayer),null);

answered Apr 17, 2016 at 21:03

Jon

912 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Vucko Over a year ago

my idea was very similary to this, just instead of null, I'd put some dummy player or something

Collectives™ on Stack Overflow

removing an object from arraylist without changing the index of other objects

1 Answer 1

1 Comment

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Linked

Related