please this code about doubly linked lis is important can any one help me?

I want to create method two add between to element or two node any here know it

?

public class DoublyLinkedListImpl<E> {

private Node head;

private Node tail;

private int size;

public DoublyLinkedListImpl() {

size = 0;

}

/**

* this class keeps track of each element information

* @author java2novice

*

*/

private class Node {

E element;

Node next;

Node prev;

public Node(E element, Node next, Node prev) {

this.element = element;

this.next = next;

this.prev = prev;

public void addBetween(Node e1, E first element, Node second element) {