CODEWITHSUNDEEP
javaarraysclassmethods
Jason Marks
Jason Marks

Reputation: 267

How to remove an item from an array at index?

Ill try to clarify.

I have:

public static void main(String[] args) {
    int a[] = {5, 6 ,7 ,8 ,9 ,10};
    removeArray takeOff = new removeArray();
    takeOff.remove(3);

    for (int i = 0 ; i < a.length ; i++){
        System.out.print(" "+a[i]);
    }
}

That should print out:

5, 6, 7, 9, 10.

The problem is the remove method, how should I write that. I have:

public class removeArray {

public void remove(int index) {       

    if (index > 0) {
        System.arraycopy(testThatArray.a, 0, testThatArray.a, 0, index);
    }

    if (index < testThatArray.a.length - 1) {
        System.arraycopy(testThatArray.a, index + 1, testThatArray.a, index, testThatArray.a.length - index - 1);
    }

}

}

Still, no?

UPDATE: I got it to print 5 6 7 9 10 10, how can i remove the last value?

Upvotes: 0

Views: 276

Answers (5)

Kawarezmey
Kawarezmey

Reputation: 21

you can't delete the index or element of array because it's already sized in the memory so you can't use delete but you can put two values { null or 0 } or another values you want to show that you already get of this.

Upvotes: 2

hoipolloi
hoipolloi

Reputation: 8044

ArrayUtils#removeElement will probably do what you want. However, consider using a List instead.

Upvotes: 0

Keytotruth
Keytotruth

Reputation: 31

Create a new array or resize it with the size of the actual array less one and loop through all the values in the array to fill the new array, but skip the one specified in the .remove method.

Upvotes: 0

ghostbust555
ghostbust555

Reputation: 2049

Arrays are fixed length sets. You cant remove a value. If you wan't to add and remove things use a List or ArrayList

Upvotes: 0

Matt Ball
Matt Ball

Reputation: 359786

Arrays cannot be resized. Use a List<Integer> (such as an ArrayList<Integer>) if you want a collection with resizability.

Otherwise, you'll have to implement this yourself by making a copy of the array that is one element smaller than the original array. Then copy all of the values except the one at the specified index from the old array to the new array.

Upvotes: 1

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