Solution: Design an Order Processing System

Learn how to create the class diagram of an order processing system using the concepts of object-oriented design.

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

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