Doubly Linked List in Java Example

import java.io.*; 
 class node 
 { 
       public int v; 
       public node nxt; 
       public node prv; 
       public node (int x) 
        { 
           v=x; 
        } 
           public void dispval() 
            { 
               System.out.println(v); 
           } 
 } 
  class LinkList 
  { 
       private node first,p,last; 
       public LinkList() 
        { 
           first=null; 
           last=null; 
        } 
            public void insertval(int x) 
              { 
                   node p=new node(x); 
                   p.nxt=null; 
                   if(first==null) 
                       { 
                          first=p; 
                          last=p; 
                          p.prv=null; 
                       } 
                            else 
                              { 
                                  last.nxt=p; 
                                  p.prv=last; 
                                  last=p; 
                              } 
           } 
      public void dispfifo() 
         { 
               System.out.println("Data in doubly linked list in fifo order"); 
               node r=first; 
               while(r !=null) 
                      { 
                          r.dispval(); 
                          r=r.nxt; 
                       } 
        } 
          public void displifo() 
              { 
                  System.out.println("Data in doubly linked list in lifo order"); 
                  node r=last; 
                  while(r !=null) 
                        { 
                           r.dispval(); 
                           r=r.prv; 
                         } 
             }                                                                             
   } 
    class DoublyLinkedList 
       { 
            public static void main(String args[])  throws IOException 
            { 
                LinkList k=new LinkList(); 
                BufferedReader b=new BufferedReader(new InputStreamReader(System.in)); 
                String h; 
                int n,i,m; 
                System.out.println("How many numbers you want to insert in linked list"); 
                h=b.readLine(); 
                n=Integer.parseInt(h); 
                System.out.println("Enter numericals in doubly linked list"); 
                 for(i=1;i<=n;i++) 
                     { 
                         h=b.readLine(); 
                        m=Integer.parseInt(h); 
                        k.insertval(m); 
                     } 
                         k.dispfifo(); 
                         k.dispfifo(); 
           } 
      }