Merging two Link List

import java.util.Scanner;

import java.util.Stack;

public class MergeList

{

    public static void main(String[] args)

    {

        Scanner in = new Scanner(System.in);

        SingleLL s1=new SingleLL();

        SingleLL s2=new SingleLL();

        int i,j;

        System.out.println("Enter 5 Elements for Link 1");

        for(i=0;i<5;i++)

            s1.AddEnd(in.nextInt());

        System.out.println("Enter 5 Elements for Link 2");

        for(i=0;i<5;i++)

            s2.AddEnd(in.nextInt());

        SingleLL s3=new SingleLL();

        s3=s1;

        s3.end.next=s2.start;

        Stack s=new Stack();

        s3.curr=s3.start;

        while(s3.curr!=null)