java 우선순위 comparator

PriorityQueue<Node> q = new PriorityQueue<>(new Comparator<Node>() {
	@Override
	public int compare(Node o1, Node o2) {
		// TODO Auto-generated method stub
		return o1.어쩌구 - o2.어쩌구; // 오름차순
	}
});

map.containsKey(키값);