Java HashSet iterator() Method

HashSet remove() Method in Java

Last Updated : 10 Mar, 2025

The HashSet remove() method in Java is used to remove a specific element from the set if it is present.

Note: HashSet and the remove() were introduced in JDK 1.2 as part of the Collections Framework and are not available in earlier versions of Java (JDK 1.0 and JDK 1.1).

Example 1: Here, the remove() method is used to remove a specified element from the set.

Java

// Java Program to demonstrates the working of remove()
import java.util.*;

public class Geeks {

    public static void main(String args[])
    {
        // Create a HashSet
        HashSet<Integer> s = new HashSet<>();
        //  add elements into a HashSet
        s.add(1);
        s.add(2);
        s.add(3);
        s.add(4);
        s.add(5);

        System.out.println("Original HashSet: " + s);

        s.remove(2);

        // Now displaying the HashSet after removal
        System.out.println(
            "HashSet after removing elements: " + s);
    }
}

Output

Original HashSet: [1, 2, 3, 4, 5]
HashSet after removing elements: [1, 3, 4, 5]

Syntax of HashSet remove() Method

public boolean remove(Object o)

Parameter: The object to be removed from the HashSet.
Return Type: This method returns true if the element is successfully removed; otherwise, it returns false.

Example 2: This example demonstrates that the remove() method in a HashSet returns a boolean value indicating whether the specified element was successfully removed.

Java

// To demonstrates that remove() method return boolean value
import java.util.*;
public class Geeks {

    public static void main(String args[])
    {
        // Create a HashSet
        HashSet<Integer> s = new HashSet<>();
        
        // Add elements into a HashSet
        s.add(1);
        s.add(2);
        s.add(3);
        s.add(4);
        s.add(5);
        
        boolean b = s.remove(2);
        System.out.println("Was 2 removed? " +b);

        boolean n = s.remove(10);
        System.out.println("Was 10 removed? " +n);

    }
}

Output

Was 2 removed? true
Was 10 removed? false

Java HashSet iterator() Method

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