size--;
	public void removeNode(Node node) {		if (node.prev == null) {			if (node.next != null) {				node.next.prev = null;				header = node.next;			} else				header = null;		} else {			node.prev.next = node.next;			if (node.next != null)				node.next.prev = node.prev;            else                last = node.prev;		}		size--;	}