With just a little knowledge of locales, resource bundles, and data format classes, you can create a great international application. Like most other internationalized products, your creation would use translated resource strings and would present data to the user using locale-sensitive format objects. That's definitely a big deal, requiring discipline and effort. But you can do better! With just a little more effort, you can create a multilingual application that allows users to switch the user interface (UI) language dynamically. That's on-the-fly, run-time language switching, and it's definitely a hot feature! If you're up to the challenge, you can add this unique capability to your product, making it stand out among its competitors.

This article presents a class design that includes a LocaleChooser JavaBean, a LocaleChangeEvent event, and a LocaleChangeListener interface. These three elements are presented to encourage the creation of multilingual, dynamic user interfaces in Java.