How do I identify that the underlying OS supports a certain language?

[johnt]

I have to display a dropdown to select a language to view the swing application in. The language options (English, Japanese, Simplified Chinese etc.) should be added to the dropdown only if the underlying OS has those language support. How do I identify that the underlying OS supports a certain language?

[levent]

Try:

       Locale[] locales = Locale.getAvailableLocales();

For more information, you can check following resources:

Identifying Available Locales (The Java™ Tutorials > Internationalization > Setting the Locale)
Trail: Internationalization (The Java™ Tutorials)
Locale (Java 2 Platform SE v1.4.2)