Returns a localized name for the given ISO 3166 country code and the given locale that is appropriate for display to the user.

  Returns a localized name for the given ISO 3166 country code and the
given locale that is appropriate for display to the user.
For example, if countryCode is "FR" and locale
is en_US, getDisplayCountry() will return "France"; if countryCode
is "US" and locale is fr_FR, getDisplayCountry() will return "Etats-Unis".
If the name returned cannot be localized according to locale,
(say, the provider does not have a Japanese name for Croatia),
this method returns null.
Returns: the name of the given country code for the specified locale, or null if it's not available.
Parameters:
- countryCode - the ISO 3166 country code string in the form of two upper-case letters between 'A' (U+0041) and 'Z' (U+005A)
- locale - the desired locale
Throws:
- NullPointerException - if countryCode or locale is null
- IllegalArgumentException - if countryCode is not in the form of two upper-case letters, or locale isn't one of the locales returned from {@link java.util.spi.LocaleServiceProvider#getAvailableLocales() getAvailableLocales()}.
See Also: Locale.getDisplayCountry(java.util.Locale),

  Returns a localized name for the given ISO 639 language code and the given locale that is appropriate for display to the user.

  Returns a localized name for the given ISO 639 language code and the
given locale that is appropriate for display to the user.
For example, if languageCode is "fr" and locale
is en_US, getDisplayLanguage() will return "French"; if languageCode
is "en" and locale is fr_FR, getDisplayLanguage() will return "anglais".
If the name returned cannot be localized according to locale,
(say, the provider does not have a Japanese name for Croatian),
this method returns null.
Returns: the name of the given language code for the specified locale, or null if it's not available.
Parameters:
- languageCode - the ISO 639 language code string in the form of two lower-case letters between 'a' (U+0061) and 'z' (U+007A)
- locale - the desired locale
Throws:
- NullPointerException - if languageCode or locale is null
- IllegalArgumentException - if languageCode is not in the form of two lower-case letters, or locale isn't one of the locales returned from {@link java.util.spi.LocaleServiceProvider#getAvailableLocales() getAvailableLocales()}.
See Also: Locale.getDisplayLanguage(java.util.Locale),

  Returns a localized name for the given variant code and the given locale that is appropriate for display to the user.

  Returns a localized name for the given variant code and the given locale that
is appropriate for display to the user.
If the name returned cannot be localized according to locale,
this method returns null.
Returns: the name of the given variant string for the specified locale, or null if it's not available.
Parameters:
- variant - the variant string
- locale - the desired locale
Throws:
- NullPointerException - if variant or locale is null
- IllegalArgumentException - if locale isn't one of the locales returned from {@link java.util.spi.LocaleServiceProvider#getAvailableLocales() getAvailableLocales()}.
See Also: Locale.getDisplayVariant(java.util.Locale),