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Object-Oriented Analysis and Design 357

11

the UML is not terribly difficult, it is a one-way street. After you move your classes into

UML diagrams, there is no turning back; you set aside the CRC cards and don’t come

back to them. It is simply too difficult to keep the two models synchronized with one

another.

Transforming CRC Cards to UML Each CRC card can be translated directly into a

class modeled with the UML. Responsibilities are translated into class methods, and

whatever attributes you have captured are added as well. The class definition from the

back of the card is put into the class documentation. Figure 11.13 shows the relationship

between the CheckingAccountCRC card and the UML class created from that card.

Class:CheckingAccount

SuperClass:Account

Responsibilities:

Track current balance

Accept deposits and transfers in

Write checks

Transfer cash out

Keep current day’s ATM withdrawal balance

Collaborations:

Other accounts

Back-office systems

Cash dispenser

FIGURE11.13
CRC card.

<<Abstract>>

Account

Checking Account

Balance : int

DaysATMWithdrawal : int

GetBalance() : int

Deposit(int amount)() : void

TransferIn(int amount)() :bool

TransferOut() : int

WriteChecks(int amount)() : bool