import java.util.HashMap; import java.util.Optional; public class Main { static Optional<String> findCapital(String country) { HashMap<String, String> capitalCities = new HashMap<String, String>(); capitalCities.put("England", "London"); capitalCities.put("Norway", "Oslo"); return Optional.ofNullable(capitalCities.get(country)); } public static void main(String[] args) { System.out.println(findCapital("Norway").orElse("Not found")); // Oslo System.out.println(findCapital("Spain").orElse("Not found")); // Not found } }