addAll

    public static int[] addAll(int[] source, int... elements) {

        int length = source.length + elements.length;
        int[] newArray = new int[length];
        int pos = 0;
        for (int element : source) {
            newArray[pos] = element;
            pos++;
        }
        for (int element : elements) {
            newArray[pos] = element;
            pos++;
        }
        return newArray;
    }