public T[] addItem(T[] oldArray, T newItem) {
        T[] newArray = (T[]) new Object[oldArray.length + 1];

        for (int i = 0; i < oldArray.length; i++) {
            newArray[i] = oldArray[i];
        }

        newArray[newArray.length-1] = newItem;

        return newArray;
    }