问题
If you have the country code US, FR (ISO-3166-1 alpha-2 country code), how do you get the Locale code (Locale.US, Locale.FRANCE) to do something like this:
System.out.println(DecimalFormat.getCurrencyInstance(Locale.US).format(12.34));
System.out.println(DecimalFormat.getCurrencyInstance(Locale.FRANCE).format(12.34));
$12.34
12,34 €
回答1:
You can't, because a Locale is used to hold a language, not a country. It can hold a language for a specific country, and for a specific variant in this country, but it's a language first. And there is no one-to-one relationship between a language and a country. Most languages are spoken in various countries, and many countries have several languages.
If you had the country code for a language, you could use new Locale(code). But with a country code, all you can do is call getAvailableLocales, loop through the results, and find one which has your country code. But there might be several ones.
回答2:
In Java7 there is the Locale.Builder, but before that there isn't an easy way. You can, however create a utility method:
- loop
Locale.getAvailableLocales() - for each check if
locale.getCountryCode().equals(countryCodeParam)and return it
回答3:
You can either create the locale,
new Locale("en", "US")
new Locale("fr", "FR")
or
iterate through Locale.getAvailableLocales() till you find your locale and then use that instance.
回答4:
A locale is specified most importantly by the ISO-639 language code, possible also a ISO-3166 country code and a variant. The Locale class has constructors that take either only a language code, or additionally a country code, or additionally a variant.
If you only have the country code, you first need a map that converts it to a language code - but that does not necessarily produce a unique result, many countries use more than one official language.
来源：https://stackoverflow.com/questions/6556792/if-you-have-the-iso-country-code-us-fr-how-do-you-get-the-locale-code-lo