HashSet remove() Method in Java

Difficulty Level : Expert
Last Updated : 26 Nov, 2018

The Java.util.HashSet.remove(Object O) method is used to remove a particular element from a HashSet.

Syntax:

HashSet.remove(Object O)

Parameters: The parameter O is of the type of HashSet and specifies the element to be removed from the HashSet.

Return Value: This method returns True if the specified element is present in the HashSet otherwise it returns False.

Below program illustrate the Java.util.HashSet.remove(Object O) method:

// Java code to illustrate HashSet.remove() 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);
  
        // Removing elements using remove() method
        set.remove("Geeks");
        set.remove("4");
        set.remove("Welcome");
  
        // Displaying the HashSet after removal
        System.out.println("HashSet after removing elements: " + set);
    }
}

Output:

HashSet: [4, Geeks, Welcome, To]
HashSet after removing elements: [To]

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