Java PriorityQueue size() Method

Last Updated : 17 Mar 2025

The size() method of PriorityQueue class returns the number of elements contained by this collection. If there are more than Integer.MAX_VALUE elements in this collection, the method returns Integer.MAX_VALUE.

Syntax

Parameter

Specified By

The size() method of PriorityQueue class is specified by:

size() method in interface Collection<E>.
size() method in interface AbstractCollection<E>.

Return Value

The size() method returns the count of elements contained by this collection.

Example 1

import java.util.PriorityQueue; 
public class PriorityQueueSizeExample1 {

	public static void main(String args[])
    {
PriorityQueue<Integer>Fqueue = new PriorityQueue<Integer>();
PriorityQueue<String>Squeue = new PriorityQueue<String>();
// Use add() method to add elements into the Queue
Fqueue.add(998);
Fqueue.add(556);
Fqueue.add(123);
Fqueue.add(375);
Fqueue.add(842);
Fqueue.add(654);
Fqueue.add(258);
Fqueue.add(682);

System.out.println("First PriorityQueue is : " + Fqueue);

System.out.println("The size of first queue is: " + Fqueue.size());
Squeue.add("Hitesh");
Squeue.add("Gaurav");
System.out.println("Second PriorityQueue is : " + Squeue);
System.out.println("The size of second queue is: " + Squeue.size());
    }
}

Output:

First PriorityQueueis : [123, 375, 258, 682, 842, 654, 556, 998]
The size of first queue is: 8
Second PriorityQueueis : [Gaurav, Hitesh]
The size of second queue is: 2

Example 2

import java.util.PriorityQueue;
class Btech_Cse implements Comparable{
    String name;
public Btech_Cse(String name) {
this.name = name;
    }
@Override
public int compareTo(Object o) {
return 0;
    }
}
public class PriorityQueueSizeExample2 {
public static void main(String[] args) {
PriorityQueue<Btech_Cse>Pqueue = new PriorityQueue<Btech_Cse>();
Btech_Cse s1 = new Btech_Cse("Krishna");
Btech_Cse s2 = new Btech_Cse("Sonu");
Btech_Cse s3 = new Btech_Cse("Arnavi");
Btech_Cse s4 = new Btech_Cse("Tisha");
Btech_Cse s5 = new Btech_Cse("Bani");
Pqueue.add(s1);
Pqueue.add(s2);
Pqueue.add(s3);
Pqueue.add(s4);
Pqueue.add(s5);
System.out.println("The strength of Btech_Cse is "+Pqueue.size());
    }
}

Output:

The strength of Btech_Cse is 5

Example 3

import java.util.PriorityQueue;

public class PriorityQueueSizeExample3 {
public static void main(String[] args) {
PriorityQueue<String>Pqeue = new PriorityQueue<String>(14);
Pqeue.offer("Himanshu");
Pqeue.offer("Rinku");
System.out.println(Pqeue.size()+" elements = "+Pqeue);
Pqeue.clear();
System.out.println(Pqeue.size()+" elements = "+Pqeue);
    }
}

Output:

2 elements = [Himanshu, Rinku]
0 elements = []

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Java PriorityQueue size() Method

Syntax

Parameter

Specified By

Return Value

Example 1

Example 2

Example 3

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