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
