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Java HashSet size() Method with Example

HashSet Class size() method: Here, we are going to learn about the size() method of HashSet Class with its syntax and example.
Submitted by Preeti Jain, on March 05, 2020

HashSet Class size() method

• size() method is available in java.util package.
• size() method is used to return the size (i.e. the no. of elements exist) of this HashSet.
• size() method is a non-static method, it is accessible with the class object only, and if we try to access the method with the class name then we will get an error.
• size() method does not throw an exception at the time of returning size.

Syntax:

    public int size();

Parameter(s):

• It does not accept any parameter.

Return value:

The return type of the method is int, it returns the number of elements to be saved in this HashSet.

Example:

// Java program to demonstrate the example 
// of int size() method of HashSet 

import java.util.*;

public class SizeOfHashSet {
    public static void main(String[] args) {
        // Instantiates a HashSet object
        HashSet < String > hs = new HashSet < String > ();

        // By using add() method is to add
        // the given object of this
        // HashSet 
        hs.add("C");
        hs.add("C++");
        hs.add("JAVA");
        hs.add("PHP");
        hs.add("SFDC");

        // Display HashSet
        System.out.println("HashSet: " + hs);

        // By using size() method is to
        // return the size of this HashSet
        int size = hs.size();

        // Display size
        System.out.println("hs.size(): " + size);
    }
}

Output

HashSet: [JAVA, C++, C, SFDC, PHP]
hs.size(): 5