Programming and Problem Solving with Java

(^328) | Inheritance, Polymorphism, and Scope

7.2 Inheritance and the Object-Oriented Design Process

Now let’s consider how a class hierarchy originates in the CRC card design process. At the

end of the filtering phase, we sometimes discover that several classes are similar. For example,

in the address book example of Chapter 6, our filtered list of classes included Address and

Work Address. Let’s look at the CRC cards for some different address objects.

Class Name: WorkAddress Superclass: Subclasses:

Responsibilities Collaborations

Create itself (name, company, street, city,

state, ZIP code)

Name

Know its name Name

return String

return String

None

None

return String

return String

return String

return String

Know its company

None

Know its street

Know its city

Know its state None

Know its ZIP code None