1. Lecture OO05 Object Scenarios Object Interaction Diagrams

2. References
Ambler, S., The Object Primer, Cambridge Univ. Press, 2001, Section 3.5, 5.9
Fowler & Scott, UML Distilled Applying the Standard Object Modeling Language, AWL, 1997, Chapt 6

3. Teaching Points Introduction to Collaboration Diagrams
ATM example using CRC cards

4. Review What about assignment? What about parameter passing?
What about equivalence?
What about garbage collection?
What is the OO paradigm?

5. Collaboration Diagrams (Objects)
A type of Interaction Diagram
Objects
name
type

6. Collaboration Diagrams
Multiple instances
here we have many objects of the class ATM

7. Collaboration Diagrams (Links)
Links indicate collaboration between objects
this is visibility

8. Collaboration Diagrams (Messages)
There must be visibility in order for a message to be sent
Numbering

9. Collaboration Diagrams (Messages)
Showing message parameters

10. Collaboration Diagrams (Messages)
self delegation

11. CRC Card Example #1 (ATM System)
Objective
Develop a ATM banking system
just the transaction handling portion (user interface is another project)
Analysis
Study requirement documents
User interviews
Existing reports
Existing files and databases

12. An ATM System
A bank account transaction processing sub-system is required for an automatic teller machine system. The sub-system is responsible for allowing a client to use his/her bank card to view the current account balance, make a deposit, or make a cash withdrawal. The user interface for the system will be a separate sub-system.

13. Candidate Classes FinancialTransaction Account BalanceInquiry PIN
Printer
AuthorizeSystemInteraction
Withdrawal
ATMSystem
Deposit
BankCardReader
Balance
KeypadScreen
UserInterface

14. Core Classes Core Undecided Irrelevant FinancialTransaction Account
BalanceInquiry
Withdrawal
Deposit
BankCardReader
AuthorizeSystemInteraction
UserInterface
Undecided
PIN (attribute)
Balance (attribute)
ATMSystem (ghost - system name)
Irrelevant
KeypadScreen
Printer

18. Teaching Points Introduction to Collaboration Diagrams
ATM example using CRC cards