user.setExtension(userData[3]);
String extension = userData[3]; if (!StringUtils.isBlank(extension)) { user.getAliases().add(extension); }
    public ExtensionsTest() {        List users = new ArrayList();        for (int i = 0; i < DATA.length; i++) {            String[] userData = DATA[i];            User user = new User();            user.setFirstName(userData[0]);            user.setLastName(userData[1]);            user.setUserName(userData[2]);            user.setExtension(userData[3]);            users.add(user);        }        m_users = Collections.unmodifiableList(users);    }