HashSet size() Method in Java

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

Syntax:

Hash_Set.size()

Parameters: This method does not takes any parameter.

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

Below program illustrate the Java.util.HashSet.size() method:

// Java code to illustrate HashSet.size() method
import java.util.*;
import java.util.HashSet;

public class HashSetDemo {
    public static void main(String args[])
    {
        // Creating an empty HashSet
        HashSet<String> set = new HashSet<String>();

        // Use add() method to add elements into the Set
        set.add("Welcome");
        set.add("To");
        set.add("Geeks");
        set.add("4");
        set.add("Geeks");

        // Displaying the HashSet
        System.out.println("HashSet: " + set);

        // Displaying the size of the HashSet
        System.out.println("The size of the set is: " + set.size());
    }
}

Output:

HashSet: [4, Geeks, Welcome, To]
The size of the set is: 4