6.30

public class BusinessDayService {
    private final BusinessDayRepository businessDayRepository;
    public BusinessDayService(BusinessDayRepository businessDayRepository) {
        this.businessDayRepository = businessDayRepository;
    }
    public BusinessDay addBusinessDay(BusinessDay businessDay) {
        return businessDayRepository.save(businessDay);
    }

    public BusinessDay updateBusinessDay(Long id, BusinessDay businessDay) {
        BusinessDay existingBusinessDay = businessDayRepository.findById(id)
                .orElseThrow(() -> new NotFoundException("Business day not found with ID: " + id));
        existingBusinessDay.setDate(businessDay.getDate());
        existingBusinessDay.setOpeningTime(businessDay.getOpeningTime());
        existingBusinessDay.setClosingTime(businessDay.getClosingTime());
        return businessDayRepository.save(existingBusinessDay);
    }
    public BusinessDay getBusinessDay(Long id) {
        return businessDayRepository.findById(id)
                .orElseThrow(() -> new NotFoundException("Business day not found with ID: " + id));
    }
    public List<BusinessDay> getAllBusinessDays() {
        return businessDayRepository.findAll();
    }
}

public class StoreService {
    public Store saveStore(Store store) {
        Map<DayOfWeek, BusinessHours> businessHoursByDayOfWeek = store.getBusinessHoursByDayOfWeek();
        BusinessHours defaultBusinessHours = store.getDefaultBusinessHours();
        for (DayOfWeek dayOfWeek : DayOfWeek.values()) {
            if (!businessHoursByDayOfWeek.containsKey(dayOfWeek)) {
                businessHoursByDayOfWeek.put(dayOfWeek, defaultBusinessHours);
            }
        }
        store.setBusinessHoursByDayOfWeek(businessHoursByDayOfWeek);
        return store;
    }
}

public class WriteReviewActivity extends AppCompatActivity {
    private boolean userEligibleToWriteReview;
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_write_review);
        userEligibleToWriteReview = checkUserEligibilityForReview();
        if (userEligibleToWriteReview) {
        } else {
            Toast.makeText(this, "매장을 이용한 유저만 리뷰 작성이 가능합니다.", Toast.LENGTH_LONG).show();
            finish();
        }
    }
    private boolean checkUserEligibilityForReview() {
        return true;
    }
    private void submitReview(String reviewText, int rating) {
        if (userEligibleToWriteReview) {
            Toast.makeText(this, "리뷰가 등록되었습니다", Toast.LENGTH_SHORT).show();
            finish();
        } else {
            Toast.makeText(this, "매장을 이용한 유저만 리뷰 작성이 가능합니다.", Toast.LENGTH_LONG).show();
        }
    }
}

import java.util.ArrayList;
import java.util.List;

public class RatingCalculator {
    private List<Integer> ratings = new ArrayList<>();
    public void addRating(int rating) {
        if (rating >= 1 && rating <= 5) {
            ratings.add(rating);
        } else {
        }
    }

    public double calculateAverageRating() {
        if (ratings.isEmpty()) {
            return 0.0;
        }
        int totalRatings = ratings.size();
        int sumRatings = 0;
        for (int rating : ratings) {
            sumRatings += rating;
        }
        double averageRating = (double) sumRatings / totalRatings;
        averageRating = Math.round(averageRating * 10.0) / 10.0;
        return averageRating;
    }
}