Set size() method in Java with Example

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

Syntax:

int size()

Parameters: This method does not takes any parameter.

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

Below program illustrate the java.util.Set.size() method:

// Java code to illustrate Set.size() method

import java.util.*;

public class SetDemo {
    public static void main(String args[])
    {
        // Creating an empty Set
        Set<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 Set
        System.out.println("Set: " + set);

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

Output:

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

Reference: https://docs.oracle.com/javase/7/docs/api/java/util/Set.html#size()