public void add(DoublyLinkedPlace node) {
		// TODO implement me
		int i = 0;

		if (node == null){
			System.out.print("An empty node can not be added.");
			return;
		}

		if(node.hasPrev() == false){
				setHead(node);
				size++;
				return;
		}
		while(i < size){
			if (node.hasNext() == false){
				setTail(node);
				size++;
				return;
			}
			i++;
		}
	}