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Example: Printing an Invoice (CRC Cards)
- To discover classes, list the nouns:
| Invoice |
Address |
Item |
Product |
Description |
| Price |
Quantity |
Total |
Amount Due |
|
- Note that Toaster is a data value for an Item
object, not a class.
- Product description and price are fields of the
Produce class.
- Quantity is not an attribute of a
Product.
- We will create an Item class that records the
product and the quantity ("3 toasters").
- Our four candidates for classes are:
| Invoice |
Address |
Item |
Product |
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