Doubly Linked list code in java
public class DLL { Node head ; Node tail ; public DLL (){ head = null ; tail = null ; } class Node { int data ; Node next ; Node prev ; Node ( int data ){ this . data = data; next = prev = null ; } } // Insertion at Beginning public void InsertionAtBeginning ( int data ){ Node newnode = new Node (data); if (head == null ) { head = newnode; tail = newnode; } else { newnode ....