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The program compiles but is not run right can somebody help plz? There are two parts a class and a main.

 public class LinkedList56 {

   

       private class node{

         int data;

         node next;

      

      }

   //create an empty linked list

       public LinkedList56(){

         first = null;

      }

   //return true if the list is empty, otherwise return false

       public boolean empty(){

         if(first == null){

         

         

            return true;        

         }

         else 

            return false;

      }

   //insert a value x at the end

       public void InsertAtEnd(LinkedList56 x, int a){

                   //create new node

         node q = new node();

         node p = new node();

         q.data = a;

         q.next = null;

                        //empty list

         if(first == null){

            first = q;

         

         }

                        //list is not empty

         else 

            p = first;

         while(p.next != null){

            p = p.next;

         

         }

         p.next = q;

      }

   //if value x is in the list, romove x

       public void Delete(int a){

         node pointer = new node();

         node doublepointer = new node();        

      

         pointer = first;

         doublepointer = pointer.next;

      

         while(doublepointer.data != a){

            pointer = doublepointer.next;

         //preptr = preptr.next;

            doublepointer = doublepointer.next;

         }

         pointer = doublepointer.next;

      }

   

   

   //Display the data values in the linked list        

       public void Display(){

         System.out.println();

      }

   //pointer to the first node in the list

      private node first;

   }

--------------------------------------MAIN----------------------------------

public class Program2 {

public static void main(String[] args)throws Exception{



LinkedList56 x = new LinkedList56();



for(int a = 1; a < 10; a++){

if((a%2 == 0)){

        x.InsertAtEnd(x,a);



x.Display();

        

x.Delete(2);

        System.out.println("list after deleting 2:");

        x.Display();

        x.Delete(6);

        System.out.println("list after deleting 6:");

        x.Display();

        if(!x.empty()){

                System.out.println("List is not empty");

        }

}

}

}

}