Test :: Components

public String displayUsername(long userId) {
    Optional<User> userOpt = getUser(userId);
    if (userOpt.isPresent()) {
        return userOpt.get().getName();
    }
    return "Anonymous";
}

public String displayUsername(long userId) {
    return getUser(userId)
        .map(user -> user.getName())
        .orElse("Anonymous");
}