ProductCatalog.java

public class ProductCatalog {
    private List<Product> products;
    private ProductRepository productRepository;
    private ProductSearchService productSearchService;
    private ProductUIService productUIService;
    private ProductReportService productReportService;
    private ProductNotificationService productNotificationService;

    public ProductCatalog() {
        products = new ArrayList<>();
        productRepository = new ProductRepository();
        productSearchService = new ProductSearchService();
        productUIService = new ProductUIService();
        productReportService = new ProductReportService();
        productNotificationService = new ProductNotificationService();
    }
}

ProductNotificationService.java

public class ProductNotificationService {

    public void sendProductNotifications() {
        // code to send product notifications
    }
}

ProductReportService.java

public class ProductReportService {

    public void generateProductReport(List<Product> products) {
        // code to generate a product report
    }
}

ProductRepository.java

public class ProductRepository {
    private DatabaseConnection dbConnection;

    public ProductRepository() {
        dbConnection = new DatabaseConnection();
    }

    public List<Product> loadProductsFromDatabase() {
        // code to load products from the database
        return new ArrayList<>();
    }

    public void saveProductsToDatabase(List<Product> products) {
        // code to save products to the database
    }

    public void addProduct(Product product, List<Product> products) {
        products.add(product);
    }

    public void removeProduct(int productId, List<Product> products) {
        // code to remove a product from the list
    }
}

ProductSearchService.java

public class ProductSearchService {

    public List<Product> searchProducts(List<Product> products, String keyword) {
        // code to search products by keyword
        return new ArrayList<>();
    }

    public List<Product> filterProducts(List<Product> products, 
        Category category, PriceRange priceRange) {
        // code to filter products by category and price range
        return new ArrayList<>();
    }
}

ProductUIService.java

public class ProductUIService {
    private UserInterface ui;

    public ProductUIService() {
        ui = new UserInterface();
    }

    public void displayProductDetails(Product product) {
        ui.displayProductDetails(product);
    }

    public void handleProductOrder(Product product, int quantity) {
        // code to handle product orders
    }
}