Internationalization enhancements for JDK 10 include:
The IETF BCP (best current practice) 47 language tags standard, which has been supported in the Locale class since Java SE 7, includes a Unicode extension subtag. As of Java SE 9, only the
-ca (calendar) and
-nu (number) extensions are supported.
Java SE 10 adds support for the following additional extensions in the relevant JDK classes:
-cu (currency type)
-fw (first day of week)
-rg (region override)
-tz (time zone)
In JDK 10, if an application specifies a locale of
en-US-u-cu-EUR, which means US English with Euro currency, java.util.Currency.getInstance(locale) instantiates a Euro
Currency. If the locale is
en-US-u-cu-JPY, a Japanese Yen
Currency is instantiated.