Java ArrayList isEmpty() usage and example

Java ArrayList Methods

The Java ArrayList isEmpty() method is used to check if the arraylist is empty.

The syntax of the isEmpty() method is:

arraylist.isEmpty()

isEmpty() parameters

isEmpty() method has no parameters.

isEmpty() return value

• Return true if arraylist contains no elements

• Return false if arraylist contains some elements

Example: Check if ArrayList is empty

import java.util.ArrayList;
class Main {
　　　　public static void main(String[] args) {
　　　　　　　　//　Create ArrayList
　　　　　　　　ArrayList<String> languages = new ArrayList<>();
　　　　　　　　System.out.println("Newly created ArrayList: ")　+　languages);
　　　　　　　　//Check if the ArrayList has any elements
　　　　　　　　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);
　　　　　　　　//Check if the ArrayList is Empty
　　　　　　　　result = languages.isEmpty();　　//　false
　　　　　　　　System.out.println("Is the ArrayList empty? ")　+　result);
　　　　}
}

Output Results

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

In the above example, we created an ArrayList named languages. Here, we used the isEmpty() method to check if the ArrayList contains any elements.

Initially, the newly created ArrayList does not contain any elements. Therefore, isEmpty() returns true. However, after adding some elements (Python,JavaAfter that, the method returns false.

Java ArrayList Methods