Internationalize/ Localize java application using locales/ ResourceBundle (example)

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  • Given a java application supporting different languages like French,German, Korean, Japanese, English etc.
  • We will localize strings for each language in different property files.
    • e.g. String pertaining to English language will be kept in one property file
    • Similarly, String of french language will be kept in french property file.
  • We will load property file depending upon language and country code.
    • e.g. We will load french property file for language=french & country=france
  • We will use Locale & ResourceBundle class to provide localization or Internationalization support for our application.

1. Project structure of project to support multiple languages is as follows:

  1. Create property file containing string for specific language & country code.
    1. e.g. Name of property file for language=English & country=USA will be <NAME>_en_us.properties
    2. Name of property file will be messages_en_US.properties
  2. Similarly, create properties for rest of languages & countries.
internationalization localization java resourcebundle locale
Fig 1: Project structure of Multilingual application

2. Internationalize/ Localize java application (ResourceBundle /example)

package org.learn;
 
import java.util.Locale;
import java.util.ResourceBundle;
 
public class DemoMultilingual {
    public static void main(String[] args) {
 
        ResourceBundle rd = ResourceBundle.getBundle("messages");
 
        //Display properties for language = english & Country = USA
        loadPropertiesByCountryAndLanguage("en","us");
 
        //Display properties for language = german & Country = germany
        loadPropertiesByCountryAndLanguage("de","DE");
 
        //Display properties for language = french & Country = france
        loadPropertiesByCountryAndLanguage("fr","FR");
 
 
        //Display properties for language = hindi & Country = india
        loadPropertiesByCountryAndLanguage("hi","in");
    }
 
    private static void loadPropertiesByCountryAndLanguage(String languageCode,
                                                            String countryCode) {
 
        Locale locale = new Locale(languageCode,countryCode);
        ResourceBundle rd = ResourceBundle.getBundle("messages",locale);
 
        String propDescription = rd.getString("description");
        String propLanguage = rd.getString("Language");
        String propCountry = rd.getString("Country");
 
        System.out.printf("Loading properties for CountryCode=%s,LanguageCode=%s",
                                                    countryCode,languageCode);
        System.out.println();
        System.out.printf("Description=%s, Language=%s, Country=%s",
                                            propDescription,propLanguage,propCountry);
        System.out.println();
        System.out.println();
    }
}

3. OP: Internationalize/ Localize java application (ResourceBundle /example)

Loading properties for CountryCode=us,LanguageCode=en
Description=Localized strings for english language, Language=English, Country=USA
 
Loading properties for CountryCode=DE,LanguageCode=de
Description=Localized strings for german language, Language=German, Country=Germany
 
Loading properties for CountryCode=FR,LanguageCode=fr
Description=Localized strings for french language, Language=French, Country=France
 
Loading properties for CountryCode=in,LanguageCode=hi
Description=Localized strings for hindi language, Language=Hindi, Country=India

Download code-Internationalize/localize/multilingual java (example)

 

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