public class Test02 {

    public static void main(String[] args) {

        ArrayList<String> list = new ArrayList<>();

        list.add("str1");

        list.add("str2");

        list.add(1,"str222");

        for (int i = 0; i < list.size(); i++) {

            CusPrint.print(list.get(i));

        }

    }

}

    public void add(int index, E element) {

        rangeCheckForAdd(index);

        ensureCapacityInternal(size + 1);  // Increments modCount!!

        System.arraycopy(elementData, index, elementData, index + 1,

                         size - index);

        elementData[index] = element;

        size++;

    }

    private void rangeCheckForAdd(int index) {

        if (index > size || index < 0)

            throw new IndexOutOfBoundsException(outOfBoundsMsg(index));

    }