Method moveToFront

java/Chapter 10/Question10_7/Cache.java:16–31

(Node node)

	}
	
	public void moveToFront(Node node) {
		if (node == head) {
			return;
		}
		removeFromLinkedList(node);
		node.next = head;
		if (head != null) {
			head.prev = node;
		}
		head = node;
		size++;
		
		if (tail == null) {
			tail = node;
		}
	}
	
	public void moveToFront(String query) {
		Node node = map.get(query);