4.) Priority Queue (basic)

 Write a program to get size of the queue.

import java.util.PriorityQueue;

public class PriorityQueueSizeExample {

    public static void main(String[] args) {

        // Create a new priority queue

        PriorityQueue<Integer> pq = new PriorityQueue<>();

        // Add some elements to the priority queue

        pq.add(10);

        pq.add(20);

        pq.add(30);

        // Get the size of the priority queue

        int size = pq.size();

        // Print the size of the priority queue

        System.out.println("Priority queue size: " + size);

    }

}