CODEWITHSUNDEEP
javaandroidlistarraylist
Oleksandr Firsov
Oleksandr Firsov

Reputation: 1478

Android Java How to properly remove int from list?

Currently I am trying to write a code that will create a list from various points coordinates and then remove 3 smallest ints from the list. When I run the app, it crashes. I figured out that i happens in remove part. I have looked into other similar threads, but the solution are similar to what I have. Here's the code I have:

    List<Integer> XPoint = Arrays.asList(A.x, B.x, C.x, D.x, E.x, F.x, G.x, K.x);
    List<Integer> XPLeft = Arrays.asList();
    int XPLeftTimes = 0;

    //Find 3 min X values(left)
    while(XPLeftTimes != 2){
    int Left = Collections.min(XPoint);
    XPoint.remove(Left); <-App crashes here
    XPLeft.add(Left);
    XPLeftTimes++;
    }

enter image description here

What am I doing wrong? Thanks in advance.

Upvotes: 3

Views: 464

Answers (3)

Max77
Max77

Reputation: 1566

Arrays.asList() returns a fixed-size list backed by the specified array.

try

List<Integer> xPoint = new ArrayList(Arrays.asList(A.x, B.x, C.x, D.x, E.x, F.x, G.x, K.x));

Upvotes: 2

Rahul Jain
Rahul Jain

Reputation: 1399

Arrays.asList() returns fixed size array which cannot be modified. if you want to modify it, you have to create a new modifiable Arraylist by copying its contents as follows:

List XPoint = new ArrayList(Arrays.asList(A.x, B.x, C.x, D.x, E.x, F.x, G.x, K.x));

List XPLeft = new ArrayList();

This should work.

Upvotes: 0

Sanjeev
Sanjeev

Reputation: 4375

When you are calling XPoint.remove(left); it is not removing that part it is removing whatever value is stored at the index(which is equal to left) that's why it is crashing If you want to remove that number try this 

XPoint.remove(new Integer(left));

Upvotes: 1

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