Java ArrayList isEmpty()

The syntax of the isEmpty() method is:

arraylist.isEmpty()

Here, arraylist is an object of the ArrayList class.

isEmpty() Parameters

The isEmpty() method does not take any parameters.

isEmpty() Return Value

• returns true if the arraylist does not contain any elements
• returns false if the arraylist contains some elements

Example: Check if ArrayList is Empty

import java.util.ArrayList;

class Main {
    public static void main(String[] args) {
        // create an ArrayList
        ArrayList<String> languages = new ArrayList<>();
        System.out.println("Newly Created ArrayList: " + languages);

        // checks if the ArrayList has any element
        boolean result = languages.isEmpty(); // true
        System.out.println("Is the ArrayList empty? " + result);

        // add some elements to the ArrayList
        languages.add("Python");
        languages.add("Java");
        System.out.println("Updated ArrayList: " + languages);

        // checks if the ArrayList is empty
        result = languages.isEmpty();  // false
        System.out.println("Is the ArrayList empty? " + result);
    }
}

Output

Newly Created ArrayList: []
Is the ArrayList empty? true
Updated ArrayList: [Python, Java]
Is the ArrayList empty? false

In the above example, we have created a arraylist named languages. Here, we have used the isEmpty() method to check whether the arraylist contains any elements or not.

Initially, the newly created arraylist does not contain any element. Hence, isEmpty() returns true. However, after adding some elements (Python, Java), the method returns false.