java priority heap priority queue

/**
 * @author lautturi.com 
 * Java example:  java PriorityQueue
 */

import java.util.*;

public class Lautturi {

	public static void main(String[] args) {
		// create a priority queue in reverse order
        PriorityQueue<Integer> prq = new PriorityQueue<>(Comparator.reverseOrder());

        // insert values to the queue
        prq.add(1);
        prq.add(2);
        prq.add(8);
        prq.add(5);
        prq.add(7);

        //print values in the queue
        while (!prq.isEmpty()) {
            System.out.print(prq.poll()+" ");
        }
	}

}

output:

8 7 5 2 1