🚗 Automotive · Class UML

Car Rental System Class Model

An object model for a car rental service: branches, cars, customers, reservations, rentals and pricing.

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Drawing diagram…

What this diagram shows

Reservations become rentals when the car is picked up
Pricing depends on car category and duration
Damage and fuel charges are added at return

Prompt used

Class diagram for car rental: Branch has many Cars; Car has a CarCategory (hatchback, sedan, SUV) and status; Customer with driving licence makes Reservations for a category at a branch; a Reservation becomes a Rental when a specific Car is assigned; Rental calculates the bill using a PricingPolicy and adds damage and fuel charges at return.

Mermaid code

classDiagram
  class Branch {
    +String id
    +String city
    +availableCars(category) List~Car~
  }
  class Car {
    +String regNo
    +CarCategory category
    +String status
  }
  class Customer {
    +String id
    +String name
    +String licenceNo
  }
  class Reservation {
    +String id
    +DateTime pickupAt
    +DateTime returnAt
    +confirm()
    +cancel()
  }
  class Rental {
    +int startOdometer
    +int endOdometer
    +returnCar(fuelLevel, damages)
    +bill() Decimal
  }
  class PricingPolicy {
    +dailyRate(category) Decimal
    +extraCharges(fuel, damages) Decimal
  }
  class CarCategory {
    <<enumeration>>
    HATCHBACK
    SEDAN
    SUV
  }
  Branch "1" --> "*" Car
  Car --> CarCategory
  Customer "1" --> "*" Reservation
  Reservation "1" --> "0..1" Rental
  Rental --> Car
  Rental ..> PricingPolicy : uses

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