import java.io.*;
import java.util.*;
import java.lang.Object;

public class BasicList
{
	/*Node creates the model for our list items 
	* each node has an integer value which is our data
	* and another Node which is a copy the next item in the list
	* which also contains an integer and a Node object of next...
	*/
	class Node{
		int data;
		Node next = null;
	}


	private Node startOfList = null;//initialized the first item to empty, the empty list

	/*
	*addTo is the method for inserting items in the list
	*it takes an integer from main, calls Node to create a new 
	*instance of Node and sets the new item to the head of the list,
	*pushing the previous item down. That item may be null in which
	*case, null now indicates the end of our list and it is how we
	*can determine that we are at the end.
	*/	

	public void addTo(int data){
		Node newNode = new Node();
		newNode.data = data;
		newNode.next = startOfList;
		startOfList = newNode;
	}

	/*
	*printList() displays the contents of our list in order
	*by checking if the next item is null, if not it keeps going.
	*
	*/

	public void printList(){
		Node current = startOfList;
		while(current != null){
			System.out.print(current.data);
			current = current.next;
		}
		System.out.println();
	}

//end methods


	public static void main(String args[]) throws Exception
	{
		BasicList list = new BasicList();
		list.addTo(3);
		list.addTo(5);
		list.addTo(9);
		list.printList();
	}//end main
}//end class