Returns an array of all locales for which this locale service provider can provide localized objects or names. This information is used to compose getAvailableLocales() values of the locale-dependent services, such as DateFormat.getAvailableLocales().

The array returned by this method should not include two or more Locale objects only differing in their extensions.

Returns:  An array of all locales for which this locale service provider can provide localized objects or names.