Local.getCountry()的描述说:Returnsthecountry/regioncodeforthislocale,whichshouldeitherbetheemptystring,anuppercaseISO31662-lettercode,oraUNM.493-digitcode.我想知道什么时候返回ISO31662字母代码以及什么时候返回UNM.493位数代码？例子:Localelocale=newLocale("de","AT");Log.i(TAG,"countrycode:"+locale.getCountry());//returns"AT"whichis