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Set size() method in Java with Example

Last Updated : 26 Jul, 2024
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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 take 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 
// 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()

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