Sprint Challenge: Advanced Java Concepts

Challenge Overview

This Sprint Challenge allows you to demonstrate your understanding of encapsulation, polymorphism, interfaces, generics, and primitive wrapper classes. You'll apply these concepts by creating a virtual E-Commerce Platform with multiple product types, shopping carts, and order processing.

Challenge Objectives

In this Sprint Challenge, you will:

• Implement encapsulation to protect your system's internal data
• Use polymorphism to handle different product types with common behaviors
• Create and use interfaces for e-commerce operations
• Apply generics for type-safe collections of products
• Work with primitive wrapper classes for data conversion

Project Description: E-Commerce Platform

Your task is to implement a virtual e-commerce platform with several key components:

1. Products System

• Create a Product interface with common behaviors
• Implement different product types (Electronics, Books, Clothing)
• Apply encapsulation principles to protect product data

2. Shopping Cart

• Design a generic ShoppingCart class
• Implement methods to add, remove, and calculate totals
• Use proper data hiding and validation

3. Order Processing

• Create an order processing system with different payment methods
• Apply polymorphism for different payment methods
• Use primitive wrapper classes for currency handling

Requirements

Product Interface and Implementations

Define a Product interface with the following methods:

public interface Product {
    String getId();
    String getName();
    double getPrice();
    int getInventoryCount();
    void decreaseInventory(int amount);
}
                

Implement at least three different product types:

• Electronics with warranty period and manufacturer
• Book with author and ISBN
• Clothing with size and color

Generic Shopping Cart

Create a generic ShoppingCart class:

public class ShoppingCart<T extends Product> {
    // Add your implementation
    // Should include methods to add products, remove products, calculate total
    // Calculate total price with tax
    // Should have method to checkout (creates an order)
}
                

Payment Processing

Create a payment system with interfaces:

public interface PaymentProcessor {
    boolean processPayment(Double amount);
    String getPaymentMethod();
}

// Implement at least two payment methods (CreditCard, PayPal, etc.)
                

Order System

Create an Order class that encapsulates:

• Order ID and customer information
• List of products purchased
• Order date and status
• Payment method used

Testing Your Implementation

Create a Main class with a demonstration of your e-commerce platform:

public class Main {
    public static void main(String[] args) {
        // Create some products
        Product laptop = new Electronics("E001", "Laptop", 999.99, 10, "TechCorp", 12);
        Product book = new Book("B001", "Java Programming", 49.99, 50, "Jane Smith", "123-456-789");
        Product shirt = new Clothing("C001", "T-Shirt", 19.99, 100, "M", "Blue");
        
        // Create a shopping cart and add products
        ShoppingCart<Product> cart = new ShoppingCart<>();
        cart.addProduct(laptop);
        cart.addProduct(book);
        cart.addProduct(shirt);
        
        // Display cart contents and total
        System.out.println("Cart Contents:");
        cart.displayCart();
        System.out.println("Total: $" + cart.calculateTotal());
        
        // Process payment and create order
        PaymentProcessor creditCard = new CreditCardPayment("1234-5678-9012-3456", "12/24", "123");
        Order order = cart.checkout("John Doe", "john@example.com", creditCard);
        
        // Display order details
        System.out.println("\nOrder created: " + order.getId());
        System.out.println("Status: " + order.getStatus());
    }
}
                

Additional Challenge Requirements

1. Implement proper encapsulation for all classes
2. Use defensive copying where appropriate
3. Apply the final keyword strategically
4. Implement appropriate equals() and hashCode() methods
5. Include appropriate exception handling
6. Add meaningful Javadoc comments

Stretch Goals:

• Implement a discount system with different discount strategies
• Add an inventory management system
• Create a customer loyalty program

Submission Requirements

To complete this Sprint Challenge, submit the following:

1. Your complete Java project with all required classes and interfaces
2. A README.md file explaining your implementation decisions
3. Demonstration of your application running with sample output