public int next()
{
int data = currentNode.getData();
currentNode = currentNode.getPrevious();
return(data);
}
public void delete(int index)
{
Node currentNode = head;
int currentIndex = 0;
if (index < 0 || index >= size)
{
return;
}
size--;
if (size == 0)
{
head = null;
tail = null;
return;
}
if (index == 0)
{
head = head.getNext();
head.setPrevious(null);
}
if (index == size - 1)
{
tail = tail.getPrevious();
tail.setNext(null);
}
if (index > 0 && index < size - 1)
{
while (currentIndex < index)
{
currentNode = currentNode.getNext();
currentIndex++;
}
currentNode.getPrevious().setNext(currentNode.getNext());
currentNode.getNext().setPrevious(currentNode.getPrevious());
}
}
public void insert(int data, int position, Iterator it)
{
Node newNode = new Node(data);
Node currentNode = it.getCurrentNode();
if (position == AFTER)
{
newNode.setNext(currentNode.getNext());
newNode.setPrevious(currentNode);
currentNode.setNext(newNode);
if (newNode.getNext() != null)
{
newNode.getNext().setPrevious(currentNode);
}
else
{
tail = newNode;
}
}
else if (position == BEFORE)
{
newNode.setPrevious(currentNode.getPrevious());
newNode.setNext(currentNode);
currentNode.setPrevious(newNode);
if (newNode.getPrevious() != null)
{
newNode.getPrevious().setNext(newNode);
}
else
{
head = newNode;
}
}
else
{
System.Console.WriteLine("No conozco el valor de position");
}
size++;
}
public void insert(int data, int position, Iterator it)
{
Node newNode = new Node(data);
Node currentNode = it.getCurrentNode();
size++;
if (position == AFTER)
{
newNode.setNext(currentNode.getNext());
currentNode.setNext(newNode);
if (newNode.getNext() != null)
{
newNode.setPrevious(currentNode);
newNode.getNext().setPrevious(newNode);
}
else
{
newNode.setNext(null);
}
}
else if (position == BEFORE)
{
newNode.setPrevious(currentNode.getPrevious());
newNode.setNext(currentNode);
currentNode.setPrevious(newNode);
if (newNode.getPrevious() != null)
{
newNode.getPrevious().setNext(newNode);
}
else
{
newNode.setPrevious(null);
}
}
}
