Java Code to Set the Default Locale

There are two ways to change the default locale. The first is to set it on the command line:
> java -Duser.language=2-char-language-code -Duser.region=2-char-country-code MyApp

// Set only language code
> java -Duser.language=fr -Duser.region= MyApp
// Set language and country code
> java -Duser.language=fr -Duser.region=CA MyApp


The second way to change the default locale is to call Locale.setDefault():
// Get default locale
Locale locale = Locale.getDefault();

// Set the default locale to pre-defined locale
Locale.setDefault(Locale.FRENCH);

// Set the default locale to custom locale
locale = new Locale("fr", "CA");
Locale.setDefault(locale);