1. Customer

Attributes:

• customerId: String
• name: String
• phoneNumber: String
• address: String

Methods:

• placeOrder()
• trackOrder()
• cancelOrder()

2. Order

Attributes:

• orderId: String
• customer: Customer
• orderItems: List<Pizza>
• totalAmount: double
• orderStatus: String
• paymentStatus: String
• timestamp: Date

Methods:

• calculateTotal()
• updateStatus()
• assignDelivery()

3. Pizza

Attributes:

• pizzaId: String
• size: String
• crustType: String
• toppings: List<Topping>
• basePrice: double

Methods:

• calculatePrice()

4. Topping

Attributes:

• name: String
• price: double

5. Payment

Attributes:

• paymentId: String
• order: Order
• amount: double
• paymentMode: String
• paymentDate: Date
• status: String

Methods:

• processPayment()
• refundPayment()

6. Inventory

Attributes:

• itemId: String
• itemName: String
• quantityAvailable: int

Methods:

• updateStock()
• checkAvailability()

7. KitchenStaff

Attributes:

• staffId: String
• name: String

Methods:

• receiveOrder()
• updateOrderStatus()

8. DeliveryExecutive

Attributes:

• deliveryId: String
• name: String
• phone: String

Methods:

• pickOrder()
• updateDeliveryStatus()

Relationships:

• Customer places Order → 1-to-many
• Order has Pizza → 1-to-many
• Pizza includes Topping → many-to-many
• Order has Payment → 1-to-1
• KitchenStaff prepares Order → many-to-many (via assignments)
• DeliveryExecutive delivers Order → 1-to-1
• Inventory tracks Toppings and Ingredients

How to Explain:

Focus on Object Interactions:

• Show how a customer placing an order leads to object creation (Order, Pizza, Payment).

Discuss Relationships:

• Use aggregation/composition to explain has-a relationships.

Encourage Students to Extend:

• Ask how they’d support combo offers, discount coupons, or real-time tracking.