Java PriorityBlockingQueue removeAll() Method

// Use of removeAll() in PriorityBlockingQueue 
// of Integer type
import java.util.Arrays;
import java.util.concurrent.PriorityBlockingQueue;
import java.util.function.Predicate;

class Geeks {
    public static void main(String[] args)
    {
        // Creating a PriorityBlockingQueue of integers
        PriorityBlockingQueue<Integer> q
            = new PriorityBlockingQueue<>();

        // Use add() to insert elements in the queue
        q.add(10);
        q.add(20);
        q.add(30);
        q.add(40);
        q.add(50);

        // Display the original PriorityBlockingQueue
        System.out.println(
            "Original PriorityBlockingQueue: " + q);

        // Creating a list of elements
        // to remove from the queue
        PriorityBlockingQueue<Integer> r
            = new PriorityBlockingQueue<>(
                Arrays.asList(30, 50));

        // Remove all elements that are in the r collection
        q.removeAll(r);

        // Display the PriorityBlockingQueue after removal
        System.out.println("PriorityBlockingQueue after removeAll(): "
                           + q);
    }
}

// Use of removeAll() in PriorityBlockingQueue 
// of String type
import java.util.concurrent.PriorityBlockingQueue;

public class Geeks {
    public static void main(String[] args) {
      
        // Creating a PriorityBlockingQueue of strings
        PriorityBlockingQueue<String> q 
          = new PriorityBlockingQueue<>();

        // Adding elements to the queue
        q.add("A");
        q.add("B");
        q.add("C");
        q.add("D");
        q.add("E");

        // Display the original PriorityBlockingQueue
        System.out.println("Original PriorityBlockingQueue: " + q);

        // Creating a collection of elements to remove
        PriorityBlockingQueue<String> r 
          = new PriorityBlockingQueue<>();
        r.add("B");
        r.add("D");

        // Removing elements from the queue
        q.removeAll(r);

        // Display the modified PriorityBlockingQueue
        System.out.println("PriorityBlockingQueue after removeAll(): " + q);
    }
}