Programming and Problem Solving with Java

CASE STUDY^305

entry. We can add more information as we go on. Here then is our filtered list of classes
for this application:

Determining Responsibilities:Let’s look at the Entry class as it was left when we stopped
the scenarios.

We can omit the “Know birthday” responsibility for the time being. Our driver needs
to create one instance of Entry at a time and write it to a file.Create!We forgot to list
Create as a responsibility. Because each class should be as encapsulated as possible,
let’s have two constructors: one that inputs values into its own fields and one that

Class Name: Entry Superclass: Subclasses:

Responsibilities Collaborations

Know name None

return Name

Know address None

return Address

Know phone number None

return Phone

Know birthday None

return Date

Entry

Name

Address

Phone number

User interface