HashSet clear() Method in Java

The Java.util.HashSet.clear() method is used to remove all the elements from a HashSet. Using the clear() method only clears all the element from the set and not deletes the set. In other words, we can say that the clear() method is used to only empty an existing HashSet.

Syntax:

Hash_Set.clear()

Parameters: The method does not take any parameter



Return Value: The function does not returns any value.

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

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java code to illustrate clear()
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);
  
        // Clearing the HashSet using clear() method
        set.clear();
  
        // Displaying the final Set after clearing;
        System.out.println("The final set: " + set);
    }
}

chevron_right


Output:

HashSet: [4, Geeks, Welcome, To]
The final set: []


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.