Untitled

import java.util.*;
public class LinkedList
{
class Node
{
int data;
Node pre;
Node next;
public Node(int data)
{
this.data=data;
}
}
Node head,tail=null;
public void display()
{
Node cur=head;
if(head==null)
{
System.out.println("List is empty");
return;
}
System.out.println("the doubly linked list is");
while(cur!=null)
{
System.out.println(cur.data+" ");
cur=cur.next;
}
}
public void addNode(int data)
{
Node newNode = new Node(data);
if(head==null)
{
head=tail=newNode;
head.pre=null;
tail.next=null;
}
else
{
tail.next=newNode;
newNode.pre=tail;
tail=newNode;
tail.next=null;
}
}
public void deleteNode(int num)
{
Node cur,temp;
if(head==null)
{
System.out.println("list is empty");
return;
}
else
{
cur = head;
while(cur.next.data!=num)
{
cur=cur.next;
}
if(cur.next==null)
{
System.out.println("cannot delete");
return;
}
else if(cur.next.next==null)
{
cur.next=null;
}
else
{
temp = cur.next;
cur.next=temp.next;
temp.next.pre=cur;
}
}
display();
}
public static void main(String args[])
{
int i,n,d,del;
LinkedList ll=new LinkedList();
Scanner s= new Scanner(System.in);
System.out.println("enter the number of elements");
n=s.nextInt();
System.out.println("enter the elements");
for(i=0;i<n;i++)
{
d=s.nextInt();
ll.addNode(d);
}
System.out.println("enteer the elements to be deleted");
del=s.nextInt();
ll.deleteNode(del);
}
}