import java.util.Iterator;
import java.util.PriorityQueue;
class PriorityQueuePoll {
public static void main(String[] args) {
// creating our queue
PriorityQueue<Integer> pq = new PriorityQueue<>();
// offer is used to add elements in a queue
pq.offer(12);
pq.offer(13);
pq.offer(14);
pq.offer(15);
pq.offer(16);
pq.offer(17);
// peek will give first value in the queue and remove it also
System.out.println("Before invoking poll() method queue is :");
System.out.println(pq);
System.out.println(pq.poll());
System.out.println("After invoking poll() method queue is :");
System.out.println(pq);
}
}