Class Diagram for the Car Rental System

Now, we’ll create the class diagram for the car rental system on the basis of the given requirements. In the class diagram, we will first identify classes (concrete, abstract, or associated) and interfaces for the system. Then, we will determine the relationship between them, according to the requirements in the previous lesson.

Components of a car rental system

As mentioned earlier, we’ll design the car rental system using a bottom-up approach.

Address and person

The Address is a custom data type that is required to store any address. The Address contains attributes like a street address, city, state, etc. In the car rental system, this class will be used to specify the address of any person or a car rental location or branch. The Person class stores information related to a person like a name, email, phone number, and address. In the Person class, there is an object of the Address type to specify the person’s address. The class representation of Address and Person is given below:

Account

Account is an abstract class that is used to store the account information of a person. This class has members like account ID, password, the status of an account, etc. There can be two types of accounts, i.e., customer and receptionist. The Customer class represents the customers who reserve the vehicle for themselves, while the Receptionist class represents the receptionist in the car rental system. Both of them can create any vehicle reservation and can cancel the reservation as well. The class representation of Account and its subclasses is given below:

Driver

Since we are designing the car rental problem, we will have a Driver class. A customer can request an additional driver at the time of reservation. The class diagram is shown below:

Vehicle

Our car rental system should have a vehicle object according to the requirements. The vehicle can be of four types: a car, truck, van, and motorcycle. For this purpose, we’ll create Vehicle as an abstract class and Car, Truck, Van, and Motorcycle as its subclasses, as shown in the figure below:

Equipment

Equipment is an abstract class that stores information about different types of equipment that can be added to the reservation. For simplicity, we’ll assume three types of equipment, i.e., navigation, child seat, and ski rack. The ...