PriorityQueue example program for retrieving, but does not remove, the head of this queue, or returns null if this queue is empty using Peek() method.

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This Program is used   for  retrieving, but does not remove, the head of this queue, or returns null if this queue is empty using  Peek() method.

Example Program

import java.util.PriorityQueue;
import java.util.comparator;

public class PriorityQ {
	public static void main(String[] args) {

		PriorityQueue<Integer> PQ = new PriorityQueue<Integer>();
		PQ.add(100);
		PQ.add(12);
		PQ.add(56);
		PQ.add(89);
		PQ.add(103);
		System.out.println("The default way:");
		for (Integer number : PQ) {
			System.out.println(number);
		}
		System.out.println("The head of this list is: " + PQ.peek());
	}

}

Output

The default way:

     12

     89

     56

     100

     103

   The head of this list is: 12

Specified by:

peek in interface Queue<E>

Returns:

the head of this queue, or null if this queue is empty.

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