Finding first element in the Queue using Peek() method

 

import java.util.Iterator;

import java.util.PriorityQueue;

class PriorityQueuePeek {

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

System.out.println("Before invoking peek() method queue is :");

System.out.println(pq);

System.out.println(pq.peek());

System.out.println("After invoking peek() method queue is :");

System.out.println(pq);

}

}