Empiric single linked list

SingleLinkedList.java

class Node 
{
	private Node next;
	private Object data;

	public Node(Object data, Node next) {
		this.next = next;
		this.data = data;
	}

	public Node(Object data) {
		this.data = data;
		this.next = null;
	}

	public void setNext(Node next) {
		this.next = next;
	}

	public Node whatsNext() {
		return this.next;
	}

	public Object getData() {
		return this.data;
	}

}

public class SingleLinkedList 
{
	private Node first;
	private Node last;
	private int  size;

	public SingleLinkedList() {
		this.first = null;
		this.last  = null;
		this.size  = 0;
	}


	public static void main(String args[]) {
		System.out.println("A ver que traes...");

		SingleLinkedList miLista = new SingleLinkedList();
		System.out.println(miLista.isEmpty());

		miLista.addLast(1);
		miLista.addLast(2);
		miLista.addLast(3);
		
		miLista.traverse();

		miLista.delFront();

		System.out.println("first: " + miLista.getFirst().getData());
		System.out.println("last: " + miLista.getLast().getData());
		System.out.println(miLista.isEmpty());


	}

	public boolean isEmpty() {
		return (this.first == null);
	}

	public Node getFirst() {
		return this.first;
	}

	public Node getLast() {
		return this.last;
	}

	public void addFront(Object data) {
		Node node = new Node(data);

		if (this.first == null) {
			node.setNext(null);
			this.last = node;
		} else {
			node.setNext(this.first);
		}
		this.first = node;
		this.size += 1;
	}

	public void addLast(Object data) {
		Node node = new Node(data);
		if (this.first == null) {
			node.setNext(null);
			this.first = node;
		} else {
			this.last.setNext(node);
		}
		this.last = node;

	}

	public void delFront() {
		if (this.first != null) {
			Node toDel    = first;
			Node newFirst = toDel.whatsNext();
			toDel = null;
			this.first = newFirst;
			this.size -= 1;
		}

	}

	/*public int search(Object needle) {

	}*/

	public void traverse() {
		Node current = first;
		while (current != null) {
			System.out.println(current.getData());
			current = current.whatsNext();
		}
	}
}