On the Internet, there are almost no barriers against international commerce. Except for language. Unfortunately, most software is still written in English. This text shows how to write software that is truly multi-lingual, using Java's very sophisticated internationalization facilities. English-only software is already obsolete. This text explores Java Unicode and provides concrete examples for using its features to create multi-lingual user interfaces, to correctly format currency, dates and times, and to ensure font support for different languages.