Change priorityQueue to max priorityqueue

Question

I have priority queue in Java of Integers:

 PriorityQueue pq= new PriorityQueue();

When I call pq.poll(

Answer 1

In Java 8+ you can create a max priority queue via one of these methods:

Method 1:

PriorityQueue maxPQ = new PriorityQueue<>(Collections.reverseOrder()); 

Method 2:

PriorityQueue maxPQ = new PriorityQueue<>((a,b) -> b - a); 

Method 3:

PriorityQueue maxPQ = new PriorityQueue<>((a,b) -> b.compareTo(a));