The HashSet isEmpty() in Java is used to check if the HashSet is empty or not.
Syntax of HashSet isEmpty() Method
boolean isEmpty()
Return Type: This method returns "true" if the HashSet is empty, otherwise returns "false".
Example: This example demonstrates how the isEmpty() method checks whether the given HashSet is empty or not.
// Java program to demonstrate the working of isEmpty()
import java.util.HashSet;
public class Geeks {
public static void main(String[] args)
{
// Create a new HashSet
HashSet<String> hs = new HashSet<>();
System.out.println("HashSet: " + hs);
// Check if the HashSet is empty
System.out.println("Is the HashSet empty? "
+ hs.isEmpty());
// Add elements to the HashSet
hs.add("Geek1");
hs.add("Geek2");
hs.add("Geek3");
System.out.println("Updated HashSet: " + hs);
// Check again if the HashSet is empty
System.out.println("Is the HashSet empty? "
+ hs.isEmpty());
}
}
Output
HashSet: [] Is the HashSet empty? true Updated HashSet: [Geek3, Geek2, Geek1] Is the HashSet empty? false