Java Switch Expression

public class Test {
    public static void main(String[] args) {
        System.out.println(countryName("CN"));
        System.out.println(countryName("EN"));
        System.out.println(countryName("US"));
        System.out.println(countryName("XX"));
    }

    private static String countryName(String shortName) {
        return switch(shortName) {
            case "CN" -> "China";
            case "EN" -> "English";
            case "US" -> {
                yield "United States";
            }
            default -> "Unknown";
        };
    }
}

Output:

China
English
United States
Unknown