What is LocaleUtils.countriesByLanguage() in Java?

How to import `LocaleUtils`

The definition of LocaleUtils can be found in the Apache Commons Lang package, which we can add 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.

You can import the LocaleUtils class as follows:

import org.apache.commons.lang3.LocaleUtils;

Syntax

public static List<Locale> countriesByLanguage(String languageCode)

Parameters

languageCode: The language code of the programming language to check which countries support it.

Return value

The method returns an unmodifiable list of countries that support the given language.

Code

import org.apache.commons.lang3.LocaleUtils;
public class Main{
    public static void main(String[] args){
        // Example 1
        String languageCode = "hi";
        System.out.println("The list of countries that support the language code " + languageCode + " is as follows:");
        System.out.println(LocaleUtils.countriesByLanguage(languageCode));
        // Example 2
        languageCode = "OL";
        System.out.println("The list of countries that support the language code " + languageCode + " is as follows:");
        System.out.println(LocaleUtils.countriesByLanguage(languageCode));
        // Example 3
        languageCode = null;
        System.out.println("The list of countries that support the language code " + languageCode + " is as follows:");
        System.out.println(LocaleUtils.countriesByLanguage(languageCode));
    }
}

Output

The list of countries that support the language code hi are as follows:
[hi_IN]
The list of countries that support the language code OL is as follows:
[]
The list of countries that support the language code null are as follows:
[]