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2. Do this while we wait for the lecture to start Assume we are building an online dating app. It allows users to indicate which other users they want to date. Complete the following partial class diagram to show the ‘wants to date’ associations. Man Woman

3. Assume we are building an online dating app. It allows users to indicate which other users they want to date. Complete the following partial class diagram to show the ‘wants to date’ associations. Man wants to date Woman

4. Assume we are building an online dating app. It allows users to indicate which other users they want to date. Complete the following partial class diagram to show the ‘wants to date’ associations. Man wants to date Woman

5. Assume we are building an online dating app. It allows users to indicate which other users they want to date. Complete the following partial class diagram to show the ‘wants to date’ associations. wants to date wants to date * * * * Man wants to date Woman * * * * wants to date

6. wants to date * Person * Man Woman

7. wants to date * Person WantsToDate * Man Woman

8. 1 * Person WantsToDate target requestor 1 * Man Woman

9. Boil water • Put tea leaves in strainer • Add hot water • Steep for a while • Remove strainer • Add milk and sugar

10. Boil water • Put tea leaves in strainer • Add hot water • Steep for a while • Remove strainer • Add milk and sugar

11. Boil water • Put tea leaves in strainer • Add hot water • Steep for a while • Remove strainer • Add milk and sugar • Serve tea • Clean table • Toast bread • Cut bread • Accept payment • Give change • Issue receipt • Wash utensils • Pay bills • Order supplies • …… … …

12. Boil water • Put tea leaves in strainer • Add hot water • Steep for a while • Remove strainer • Add milk and sugar • Serve tea • Clean table • Toast bread • Cut bread • Accept payment • Give change • Issue receipt • Wash utensils • Pay bills • Order supplies • …… … …

13. Boil water • Put tea leaves in strainer • Add hot water • Steep for a while • Remove strainer • Add milk and sugar • 1 chef • 2 waiters • 1 cashier • 1 part time accountant • 1 manager • 1 cash register • 1 stove • Serve tea • Clean table • Toast bread • Cut bread • Accept payment • Give change • Issue receipt • Wash utensils • Pay bills • Order supplies • …… … …

14. 4 OOP Abstraction Encapsulation Inheritance Polymorphism

15. function function Data Data function Data Data function Data Data function Data function Data

16. function function Data Data function Data Data function Data Data function Data function Data

17. Student function function Data Data Course Data function Data Data function Data Data function function Data Lecturer

18. Student function function Data Data

19. john: Student function function Data Data cs2103: Course damith: Lecturer

20. john: Student

21. Student NgStudent PgStudent UgStudent

22. {abstract} Student NgStudent PgStudent UgStudent

23. <<interface>> Student NgStudent PgStudent UgStudent

24. :Lecturer :NgStudent :PgStudent :UgStudent study() foo() study() bar () study() goo ()

25. :Lecturer :NgStudent :PgStudent :UgStudent study() foo() study() bar () study() goo ()

26. :Lecturer :NgStudent :PgStudent :UgStudent study() foo() study() bar () study() goo ()

27. :Lecturer :Student :NgStudent :PgStudent :UgStudent

28. L1-L6 • Basic SE knowledge [up to B+] • Theory covered •  Practice in project  internalize L7-L12 • Intermediate SE knowledge [A- to A+] • Today • Better design • Better code • Better documentation

29. Image credit: http://uxmag.com/articles/the-dirtiest-word-in-ux-complexity

30. Image credit: http://uxmag.com/articles/the-dirtiest-word-in-ux-complexity

31. Advanced user Novice user