Solution: Design an Order Processing System

You must have gone through the various steps to design a complete class diagram of the case study given in the previous lesson. Let’s discuss how we can build a complete class diagram for the order processing system step by step:

Identify classes

Let’s split our order processing system into multiple steps to make the entire process convenient to follow.

• The customer logs in with their account, adds items to the cart, and places the order.
• The respective management team monitors the order, and instructions are transferred to the appropriate team prepare the order.
• After the order is prepared, it is shipped for delivery at its exact destination.
• Payment is made (either through cash or card), and finally, the order is delivered.

From the steps above, we can identify the following classes:

• Customer
• Order
• Product
• Payment
• Cash
• Card