Object Oriented Design

CRC Cards

Once a set of classes had been identified, you need to define the behavior (member functions) for each classes.
A simple rule for finding member functions is to look for verbs in the task description, and then match the verbs to the appropriate objects.
To create an invoice we need to compute the amount due.
- Do customers compute the amount due?
- Do invoices total up the amount due?
- Do items total themselves up?