Object-Oriented Programming: Intermediate Concepts

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2. Assume AddressBook is keeping track of all commands executed earlier Command History execute() undo() add(Command) (a) 1 (b) 0..1 (c) * (d) 1..* mul {a|b|c|d} e.g. mul b 77577OR tinyurl.com/answerpost

3. OOP: Intermediate Concepts CS2103/T, Lecture 4, Part 1, [Sep 2, 2016]

4. How to structure? Object rules Collaborating objects Object structure Follow a paradigm 1 2 3 4 OOP 1. Abstraction 2. Encapsulation 3. ………….. 4. ……………..

5. Some more rules How to structure? Object rules Collaborating objects Object structure Follow a paradigm 1 2 3 4 OOP 1. Abstraction 2. Encapsulation 3. ………….. 4. ……………..

7. borrows Book Student Book Student borrowed by

8. borrows Book Student Where to put return date?

9. borrows Book Student Book Student Loan returnDate borrows Association classes

10. borrows Book Student Book Student Loan Book Student Loan returnDate returnDate borrows Association classes

11. Book Student Loan returnDate borrows Association classes

12. Book Student Loan returnDate borrows Association classes

13. Book Student Loan Chapter returnDate borrows

14. Book Student Loan Chapter returnDate borrows Composition

15. Book Student Loan Chapter Shelf returnDate borrows Composition

16. Book Student Loan Chapter Shelf returnDate borrows Composition Aggregation

17. Book Chapter Shelf Composition Aggregation

18. Composition Aggregation

19. Composition Aggregation

20. Book Student Loan Chapter Shelf returnDate borrows Aggregation Composition

21. Book Student Loan Chapter Shelf returnDate borrows Aggregation Composition

22. Book Student Loan Chapter Shelf returnDate borrows Where to put total students?

23. Book Loan Chapter Shelf Student returnDate -totalStudents +getTotal() borrows You mean I can say Student.getTotal() ? Class-level members

24. Book Loan Chapter Shelf Student returnDate -totalStudents +getTotal() borrows You mean I can say Student.getTotal() ? OK. Can I say Student.totalStudents? Class-level members

25. Book Loan Student returnDate -totalStudents +getTotal() borrows Class-level members

26. foo bar() Composition Aggregation Association classes Class-level members

29. How to structure? Object rules Collaborating objects Object structure Follow a paradigm 1 2 3 4 OOP 1. Abstraction 2. Encapsulation 3. ………….. 4. ……………..

31. Can it give the object structure we need? Is this good to go? Possibly. It follows the real world. History :History TextUi MSLogic Storage :MSLogic :Storage :TextUi Minefield :Minefield ? Square s1:Square s2:Square s3:Square s4:Square m1:Mine Mine m2:Mine Can it give the behavior we need?

33. The architect

35. :UI Sequence Diagrams [interactions between components for a given scenario]

36. :UI operation returned value Sequence Diagrams [interactions between components for a given scenario]

37. :UI

38. :UI

39. :UI

40. :UI

41. :UI

44. SD for PC phone 1. User presses digit 2. System shows digit Repeat step 1-2 until telephone number is entered. 3. User press ‘send’ 4. System connects the call. Telephone conversation takes place. 5. User press ‘end’ 6. System disconnects the call Use case ends. :PCPhoneUI User loop [Until full number] press key Shows digit ‘send’ call connected ‘end’ call disconnected

45. :UI

46. :UI

47. :UI :MSLogic

48. :UI :MSLogic

50. No. That’s against SRP! I want a foo()