2.) Priority Queue (basic)

 How to remove element from priority queue

import java.util. PriorityQueue;

public class Example {

    public static void main(String[] args) {

        // Create a priority queue of integers

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

        // Add elements to the priority queue

        pq.add(5);

        pq.add(3);

        pq.add(7);

        pq.add(1);

        // Print the elements of the priority queue

        System.out.println("Priority Queue before removal: " + pq);

        // Remove elements from the priority queue

        pq.remove(3);

        pq.remove(7);

        // Print the elements of the priority queue after removal

        System.out.println("Priority Queue after removal: " + pq);

    }

}