The Java.util.HashSet.isEmpty() method is used to check if a HashSet is empty or not. It returns True if the HashSet is empty otherwise it returns False.
Syntax:
Hash_Set.isEmpty()
Parameters: This method does not take any parameter
Return Value: The function returns True if the set is empty else returns False.
Below program illustrate the Java.util.HashSet.isEmpty() method:
// Java code to illustrate contains()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); // Check for the empty set System.out.println("Is the set empty: " + set.isEmpty()); // Clearing the set using clear() method set.clear(); // Again Checking for the empty set System.out.println("Is the set empty: " + set.isEmpty()); }} |
Output:
HashSet: [4, Geeks, Welcome, To] Is the set empty: false Is the set empty: true
