Trying to learn link list

[Yafet Negussie]

Hi,
I'm trying to learn link lists. I understand the general concept, but I'm having difficulties implementing simple singly linked list. Here is the code so far, but it doesn't compile... I appreciate any explanations of what I'm doing wrong and how the code is supposed to be implemented.

import java.lang.Object.*;

public class Sll{
	protected Node head;
	protected long size;
	public Sll()
	{
		head = new Node(null);
		size = 0;
	}

public void add(Object data)
{

	Node temp = new Node();
	temp.setNext(head);
	head = data;
	size = size +1;
}



private class Node{

	private String element;
	private Node next;

	public Node(String s, Node n){

		element = s;
		next = n;
	}

	public String getElement(){
		return element;
	}

	public Node getNext(){
		return next;
	}

	public void setElement(String newElem)
	{
		element = newElem;
	}

	public void setNext(Node newNext)
	{
		next = newNext;
	}


}

}

[Junilu Lacar]

Next time, you should post the compiler error message as well; that will help folks help you. On Line 15, you are trying to instantiate a Node with a no-argument constructor. However, as you have written Node, it doesn't have a no-argument constructor.