짜잔비빔

public class UserService { UserDao userDao; public UserService(UserDao userDao) { this.userDao = userDao; } public void upgradeLevels() { List users = userDao.getAll(); for (User user : users) { Boolean changed = null; if (user.getLevel() == Level.BASIC && user.getLogin() >= 50) { user.setLevel(Level.SILVER); changed = true; } else if (user.getLevel() == Level.SILVER && user.getRecommend() >= 30..