HashSet add() Method in Java

The Java.util.HashSet.add() method in Java HashSet is used to add a specific element into a HashSet. This method will add the element only if the specified element is not present in the HashSet else the function will return False if the element is already present in the HashSet.

Syntax:

Hash_Set.add(Object element)

Parameters: The parameter element is of the type HashSet and refers to the element to be added to the Set.

Return Value: The function returns True if the element is not present in the HashSet otherwise False if the element is already present in the HashSet.

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

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java code to illustrate add()
import java.io.*;
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);
    }
}

chevron_right


Output:

HashSet: [4, Geeks, Welcome, To]


My Personal Notes arrow_drop_up

Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.