public void initList()
{
head.setprev(null);
head.setnext(tail);
tail.setnext(null);
tail.setprev(head);
}
public void AddLast(T element)
{
Node <T> cursor = tail;
Node <T> newNode = new Node <T>(element);
newNode.setnext(cursor);
newNode.setprev(cursor.getprev());
cursor.setprev(newNode);
cursor.getprev().setnext(newNode);
length++;
}
