How to Get List of All Country Codes in Java Using Locale Class

Make use of the below code if you want to work with the list of Countries in the World and their 2-character ISO country codes.

   /**
     * Method to get a sorted map of country names and their
     * ISO 3166 Country Codes
     * 
     * @return Treemap of <Country,Country Code>
     */
    public Map<String,String> getCountryCodeDetails() {

        Map<String, String> mapOfCountryAndCodes = new TreeMap();
        String[] countriesLocaleArr = Locale.getISOCountries();

        for (String countryCode : countriesLocaleArr) {

            Locale locale = new Locale("en", countryCode);
            mapOfCountryAndCodes.put(locale.getCountry(), locale.getDisplayCountry());

        }
       return mapOfCountryAndCodes;

    }

Map<String,String> countryCodeMap = countryCodes.getCountryCodeDetails();
countryCodeMap.forEach((code, country) -> System.out.println((code + ": " + country)));

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