How to do this

Given the following "MyDoubleLinkedList" class: public class MyDoublelinkedList implements MyList { private Node head, tail; private int size; /** Create a default list */ public MyLinked List() { head-tail=null; size=0; } private static class Node { T element; Node next; Node previous; public Node(T element) { this.element = element; 3 Node previous; public Node(T element) { this.element = element; } } Write the code fragment to insert a new node at a given index. insert(2,15) heads 10 20 30 40 Will result in 10 20 15 30 40