Double Linked List

public class DLL { 
    Node head; // head of list 
  
    /* Doubly Linked list Node*/
    class Node { 
        int data; 
        Node prev; 
        Node next; 
  
        // Constructor to create a new node 
        // next and prev is by default initialized as null 
        Node(int d) { data = d; } 
    } 
}