How to remove element from an array

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You cannot remove an element from an array. The size of a Java array is determined when the array is allocated, and cannot be changed. The best you can do is:

  • Assign null to the array at the relevant position; e.g.

    test[1] = null;

    This leaves you with the problem of dealing with the “holes” in the array where the null values are. (In some cases this is not a problem … but in most cases it is.)

  • Create a new array with the element removed; e.g.

    String[][] tmp = new String[test.length - 1][];
int j = 0;
for (int i = 0; i < test.length; i++) {
    if (i != indexOfItemToRemove) {
        tmp[j++] = test[i];
    }
}
test = tmp;

    The Apache Commons ArrayUtils class has some static methods that will do this more neatly (e.g. Object[] ArrayUtils.remove(Object[], int), but the fact remains that this approach creates a new array object.

A better approach would be to use a suitable Collection type. For instance, the ArrayList type has a method that allows you to remove the element at a given position.

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