How to use the HashMap isEmpty() function in Java

import java.util.HashMap;
class ExampleHashMap {
    public static void main(String[] args) {
        // create a new hashmap
        HashMap<String, Integer> results = new HashMap<>();
        System.out.println("A HashMap for mapping marks to students");
        // check if the results hashmap is empty
        boolean empty = results.isEmpty();
        if (empty)
        {
            System.out.println("The Results Hashmap is empty");
        }
        else
        {
            System.out.println("The Results Hashmap is not empty");
        }
        // add elements to the hashmap
        results.put("Ali", 89);
        results.put("Ahmed", 95);
        results.put("Sana", 70);
        results.put("Amna", 100);
        //display the hashmap
        System.out.println("Updated HashMap: " + results);
        //check if it is empty again
        empty = results.isEmpty(); 
        if (empty)
        {
            System.out.println("The Results Hashmap is empty");
        }
        else
        {
            System.out.println("The Results Hashmap is not empty");
        }
    }
}