Get elements of a java pgm

Get elements of a LinkedList

import java.util.*;

public class Main

{

   private LinkedList list = new LinkedList();

   public void push(Object v)

  {

      list.addFirst(v);

   }

   public Object top()

  {

      return list.getFirst();

   }

   public Object pop()

  {

      return list.removeFirst();

   }

   public static void main(String[] args)

  {

      Main stack = new Main();

      for (int i = 30; i < 40; i++)

         stack.push(new Integer(i));

      System.out.println(stack.top());

      System.out.println(stack.pop());

      System.out.println(stack.pop());

      System.out.println(stack.pop());

   }

}