PriorityQueue size() Method in Java

The Java.util.PriorityQueue.size() method is used to get the size of the PriorityQueue or the number of elements present in the PriorityQueue.

Syntax:

Priority_Queue.size()

Parameters: This method does not takes any parameter.



Return Value: The method returns the size or the number of elements present in the PriorityQueue.

Below programs illustrate the Java.util.PriorityQueue.size() method:
Program 1:

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// Java code to illustrate size()
import java.util.*;
  
public class PriorityQueueDemo {
    public static void main(String args[])
    {
        // Creating an empty PriorityQueue
        PriorityQueue<String> queue = new PriorityQueue<String>();
  
        // Use add() method to add elements into the Queue
        queue.add("Welcome");
        queue.add("To");
        queue.add("Geeks");
        queue.add("For");
        queue.add("Geeks");
  
        // Displaying the PriorityQueue
        System.out.println("PriorityQueue: " + queue);
  
        // Displaying the size of the PriorityQueue
        System.out.println("The size of the queue is: " + queue.size());
    }
}

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Output:

PriorityQueue: [For, Geeks, To, Welcome, Geeks]
The size of the queue is: 5

Program 2:

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// Java code to illustrate size()
import java.util.*;
  
public class PriorityQueueDemo {
    public static void main(String args[])
    {
        // Creating an empty PriorityQueue
        PriorityQueue<Integer> queue = new PriorityQueue<Integer>();
  
        // Use add() method to add elements into the Queue
        queue.add(10);
        queue.add(15);
        queue.add(30);
        queue.add(20);
        queue.add(5);
        queue.add(18);
  
        // Displaying the PriorityQueue
        System.out.println("PriorityQueue: " + queue);
  
        // Displaying the size of the PriorityQueue
        System.out.println("The size of the queue is: " + queue.size());
    }
}

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Output:

PriorityQueue: [5, 10, 18, 20, 15, 30]
The size of the queue is: 6


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