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What is ArrayUtils.isEmpty in Java?

abhilash

isEmpty is a static method of the ArrayUtils class that checks whether the given array is empty or null.

Add the apache commons-lang package

ArrayUtils is defined in the Apache Commons Lang package. Apache Commons Lang can be added to the Maven project by adding the following dependency to the pom.xml file.


<dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.12.0</version>
</dependency>

For other versions of the commons-lang package, refer to the Maven Repository.

Importing ArrayUtils

You can import the ArrayUtils class as follows:


import org.apache.commons.lang3.ArrayUtils;

Syntax


public static boolean isEmpty(final int[] array)

Parameters

final int[] array: This parameter is an array to check for emptiness.

Returns

This method returns true if the array is empty or null, and returns false otherwise.

Code

Example 1

  • array = [1,2,3,4,5]

Applying the isEmpty function will result in false, as the array is not empty.

Example 2

  • array = []

Applying the isEmpty function will result in true, as the array is empty.

import org.apache.commons.lang3.ArrayUtils;

public class Main {

    public static void main(String[] args) {
        int[] array = {1,2,3,4,5,2,3,2,2,4};
        boolean check = ArrayUtils.isEmpty(array);
        System.out.println("Array is empty - " + check);
        
        int[] array1 = new int[0];
        check = ArrayUtils.isEmpty(array1);
        System.out.println("Array1 is empty - " + check);

    }
}

Output


Array is empty - false
Array1 is empty - true

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