Purpose of the Class Diagram

The class diagram represents the static structure of the system. It describes the classes, their attributes, methods, and the relationships (associations, dependencies, aggregations) between them.

Key Classes and Their Descriptions

1. User (Abstract Class)

Attributes:

• userId: String
• name: String
• email: String
• password: String

Methods:

• login()
• logout()
• updateProfile()

 

This acts as the base class for Customer, Seller, and Admin.

2. Customer (extends User)

Attributes:

• addressList: List<Address>
• cart: Cart

Methods:

• addToCart(product)
• placeOrder()
• viewOrderHistory()
• writeReview(product, review)

3. Seller (extends User)

Attributes:

• storeName: String
• productList: List<Product>

Methods:

• addProduct(product)
• updateInventory(product)
• viewOrders()

4. Admin (extends User)

Attributes:

• adminLevel: int

Methods:

• approveSeller(seller)
• blockUser(userId)
• manageCategories()

5. Product

Attributes:

• productId: String
• name: String
• description: String
• price: double
• stockQuantity: int
• rating: double

Methods:

• updateStock()
• calculateDiscount()

6. Cart

Attributes:

• cartId: String
• items: List<CartItem>

Methods:

• addItem(product, quantity)
• removeItem(productId)
• calculateTotal()

7. CartItem

Attributes:

• product: Product
• quantity: int

8. Order

Attributes:

• orderId: String
• orderDate: Date
• customer: Customer
• items: List<OrderItem>
• status: String
• totalAmount: double

Methods:

• updateStatus()
• cancelOrder()

9. OrderItem

Attributes:

• product: Product
• quantity: int
• priceAtPurchase: double

10. Payment

Attributes:

• paymentId: String
• amount: double
• paymentDate: Date
• paymentMethod: String

Methods:

• processPayment()
• refundPayment()

11. Delivery

Attributes:

• deliveryId: String
• orderId: String
• deliveryStatus: String
• estimatedDeliveryDate: Date

Methods:

• updateStatus()

12. Review

Attributes:

• reviewId: String
• rating: int
• comment: String
• customer: Customer
• product: Product

Methods:

• editReview()
• deleteReview()

Relationships

• Customer uses Cart and places Order
• Order has OrderItems and is associated with Payment and Delivery
• Product is managed by Seller and reviewed by Customer
• User is the base class for Customer, Seller, and Admin
• Cart contains CartItems, each linked to a Product