Is en_EN a valid language locale

Question

In the example for internationalization at JavaFX 2 and Internationalization the locale passed is resolved as en_EN. Is it even a valid locale?

en = language English, UK = country United Kingdom. Now England is not separately listed in java. You might however introduce a variant `en_UK_EN` for own translations for non-Scottish, non-Wales things like "jolly". Non found keys then default to the predefined en_UK. — Joop Eggen, Jul 27 '15 at 11:59
`en_GB` is correct language code, not `en_UK`! I had issues with `en_EN ` when localizing dates (date was not formatted as european date). — Piro, Jul 06 '17 at 06:31

score 4 · Accepted Answer · answered Jul 27 '15 at 11:46

See Enabled Locales for java.util and java.text Functionality for a list of all supported locales by Oracle's JDK 8 and the JRE 8.

The language tag en-EN is not listed.

That's because the string given as the country code ("EN") is not an assigned ISO 3166 alpha-2 country code (see Locale, "country (region)").

A list of all 2-letter country codes defined in ISO 3166 can be retrieved with Locale.getISOCountries().

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