We can add a new class called “AutomatedCarWash” and connect it to the “Customer” class through an association. The “AutomatedCarWash” class will have attributes such as “washType” and “carType”, as well as methods for computing the fee and indicating if the wash is busy or not. The “ControlPanel” class can also be updated to display the amount due for the car wash selected by the customer. The updated UML class diagram would look something like this:
+-----------------+ +------------------+
| Customer | | AutomatedCarWash |
+-----------------+ +------------------+
| -name: String |<>------| -washType: String |
| -phoneNumber: | | -carType: String |
| String |<>------| |
+-----------------+ | +computeFee(): |
| float |
| +isBusy(): Boolean|
+------------------+
+---------------+
| ControlPanel |
+---------------+
| |
+---------------+
