Checking if a HashMap is empty in Java

23 Oct 2023

Here’s a code example demonstrating how to check if a HashMap is empty:

import java.util.HashMap;

public class EmptyHashMapExample {
    public static void main(String[] args) {
        HashMap<String, Integer> hashMap = new HashMap<>();

        // Adding key-value pairs to the HashMap
        hashMap.put("apple", 1);
        hashMap.put("banana", 2);
        hashMap.put("orange", 3);

        // Checking if the HashMap is empty
        boolean isEmpty = hashMap.isEmpty();

        // Displaying the result
        if (isEmpty) {
            System.out.println("HashMap is empty");
        } else {
            System.out.println("HashMap is not empty");
        }
    }
}

In this example, we create a new HashMap and add some key-value pairs to it. We then use the isEmpty() method to check if the HashMap is empty or not. The result is stored in the isEmpty variable, and we display the appropriate message based on the result.

Remember to import the HashMap class from the java.util package before using it.

You can find more information about the isEmpty() method in the Java HashMap documentation.