How to remove an element from the two dimensional array in java

Question

I have a multi dimensional array as

private int numbers[][] ={{ 170, 100 },{ 270, 100 },{ 370, 100 },{ 470, 100 }}

Now i am changing there positions using Collections.shuffle(Arrays.asList(numbers)); Now i want to remove the the first item from the shuffled array i.e if the first item is {170,100} , it must be deleted from the array. For that, i tried to do something like this

 List<int[]> points =Arrays.asList(numbers);
 Collections.shuffle(points);
 points.remove(0);

but it is throwing java.lang.UnsupportedOperationException could anybody help me out to remove the first element from the two dimensional day.

Masudul · Accepted Answer · 2013-07-02 10:52:20Z

3

Use following code:

 List<int[]> points =new ArrayList(Arrays.asList(numbers));
 Collections.shuffle(points);
 points.remove(0);

answered Jul 2, 2013 at 10:52

Masudul

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Reimeus · Accepted Answer · 2013-07-02 10:46:23Z

2

How about

List<int[]> points = new ArrayList(Arrays.asList(numbers));

answered Jul 2, 2013 at 10:46

Reimeus

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Community · Accepted Answer · 2017-05-23 12:28:59Z

0

Well, its written in the API of Arrays#asList method

Returns a fixed-size list backed by the specified array. (Changes to the returned list "write through" to the array.)

You cannot modify the returned list. What you can do is to employ Masud's suggestion.

edited May 23, 2017 at 12:28

CommunityBot

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answered Jul 2, 2013 at 10:51

darijan

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Tala · Accepted Answer · 2013-07-02 10:53:23Z

0

The problem is that Arrays.asList returns a List which is privately declared in Arrays class.

 private static class ArrayList<E> extends AbstractList<E>
    implements RandomAccess, java.io.Serializable

and doesn't implement modification operations, thus yuo're getting

public E remove(int index) {
    throw new UnsupportedOperationException();
}

from it's superclass AbstractList.

As Reimeus suggested: wrap it into java.util.ArrayList or LinkedList

answered Jul 2, 2013 at 10:53

Tala

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