[java] equivalent to push() or pop() for arrays?

I am trying to add, remove and reference items from an array I create in my main java file, but I am having trouble figuring out the correct syntax. In actionscript they have push() and pop() for adding and removing items in an array, is there an equivalent in android?

For those who don't have time to refactor the code to replace arrays with Collections (for example ArrayList), there is an alternative. Unlike Collections, the length of an array cannot be changed, but the array can be replaced, like this:

array = push(array, item);

The drawbacks are that

• the whole array has to be copied each time you push, and
• the original array Object is not changed, so you have to update the variable(s) as appropriate.

Here is the push method for String:
(You can create multiple push methods, one for String, one for int, etc)

private static String[] push(String[] array, String push) {
    String[] longer = new String[array.length + 1];
    for (int i = 0; i < array.length; i++)
        longer[i] = array[i];
    longer[array.length] = push;
    return longer;
}

This alternative is more efficient, shorter & harder to read:

private static String[] push(String[] array, String push) {
    String[] longer = new String[array.length + 1];
    System.arraycopy(array, 0, longer, 0, array.length);
    longer[array.length] = push;
    return longer;
}

You can use Arrays.copyOf() with a little reflection to make a nice helper function.

public class ArrayHelper {
    public static <T> T[] push(T[] arr, T item) {
        T[] tmp = Arrays.copyOf(arr, arr.length + 1);
        tmp[tmp.length - 1] = item;
        return tmp;
    }

    public static <T> T[] pop(T[] arr) {
        T[] tmp = Arrays.copyOf(arr, arr.length - 1);
        return tmp;
    }
}

Usage:

String[] items = new String[]{"a", "b", "c"};

items = ArrayHelper.push(items, "d");
items = ArrayHelper.push(items, "e");

items = ArrayHelper.pop(items);

Results

Original: a,b,c

Array after push calls: a,b,c,d,e

Array after pop call: a,b,c,d

Use Array list http://developer.android.com/reference/java/util/ArrayList.html

You can use LinkedList. It has methods peek, poll and offer.