COP 3503 FALL 2012 Shayan Javed Lecture 9

1. COP 3503 FALL 2012ShayanJavedLecture 9 Programming Fundamentals using Java

2. UML Diagrams

3. UML • Unified Modeling Language

4. UML • Unified Modeling Language • Goal: • Common language for creating models of Object-Oriented software

5. UML • Unified Modeling Language • Goal: • Common language for creating models of Object-Oriented software • Two aspects: • Class Diagrams (Static design): Classes, Attributes, Relationships

6. UML • Unified Modeling Language • Goal: • Common language for creating models of Object-Oriented software • Two aspects: • Class Diagrams (Static design): Classes, Attributes, Relationships • Dynamic design: Objects, messages, finite state machines [Sequence/Activity/State Machine diagrams]

7. Class Diagrams • Depict classes within a model

8. Class Diagrams • Depict classes within a model • Classes have: • Attributes (Properties/Member Variables)

9. Class Diagrams • Depict classes within a model • Classes have: • Attributes (Properties/Member Variables) • Operations (Functions/Methods)

10. Class Diagrams • Depict classes within a model • Classes have: • Attributes (Properties/Member Variables) • Operations (Functions/Methods) • Relationships with other classes

11. Class Diagrams Class Properties Methods()

12. Class Diagrams GeometricObject color : String name : String area : double GeometricObject() GeometricObject(String, String) get() : String/double set(..) : void

13. Class Diagrams • Properties • name : type

14. Class Diagrams • Properties • name : type • Ex.: • area : double

15. Class Diagrams • Methods: • name(parameters) : return type

16. Class Diagrams • Methods: • name(parameters) : return type • Ex.: • getArea( ) : double

17. Class Diagrams • Methods: • name(parameters) : return type • Ex.: • getArea( ) : double • setColor(color : String) : void

18. Class Diagrams • Properties/Methods can be public/private/protected/static

19. Class Diagrams • Properties/Methods can be public/private/protected/static • Need a way to indicate that somehow

20. Class Diagrams • Properties/Methods can be public/private/protected/static • Need a way to indicate that somehow • Add a sign next to the property/method: • Public (+)

21. Class Diagrams • Properties/Methods can be public/private/protected/static • Need a way to indicate that somehow • Add a sign next to the property/method: • Public (+) • Private (-)

22. Class Diagrams • Properties/Methods can be public/private/protected/static • Need a way to indicate that somehow • Add a sign next to the property/method: • Public (+) • Private (-) • Protected(#)

23. Class Diagrams • Properties/Methods can be public/private/protected/static • Need a way to indicate that somehow • Add a sign next to the property/method: • Public (+) • Private (-) • Protected(#) • To indicate a static property/method, underline it

24. Class Diagrams • Final (constant) properties are declared by writing them in ALL_CAPS • (Math.PI for example)

25. Class Diagrams GeometricObject # Color : String # name : String # area : double + GeometricObject() + GeometricObject(String, String) + get() : String/double + set(..) : void

26. Class Diagrams • But GeometricObject is abstract

27. Class Diagrams • But GeometricObject is abstract • How do you differentiate between an abstract and non-abstract class/method?

28. Class Diagrams • But GeometricObject is abstract • How do you differentiate between an abstract and non-abstract class/method? • Italicize it

29. Class Diagrams GeometricObject # Color : String # name : String # area : double + GeometricObject() + GeometricObject(String, String) + get() : String/double + set(..) : void + getArea() : double

30. Class Diagrams • But can’t italicize when writing...

31. Class Diagrams • But can’t italicize when writing... • So to indicate abstract methods/classes on paper write {abstract} in brackets

32. Class Diagrams GeometricObject {abstract} # Color : String # name : String # area : double + GeometricObject() + GeometricObject(String, String) + get() : String/double + set(..) : void + getArea() : double {abstract}

33. Class Diagrams • Relationships between classes: • Generalization (Inheritance = “is a”)

34. Class Diagrams • Relationships between classes: • Generalization (Inheritance = “is a”) • Aggregation (“has a”)

35. Class Diagrams • Relationships between classes: • Generalization (Inheritance = “is a”) • Aggregation (“has a”) • Composition (“owns a”)

36. Class Diagrams • Generalization (Inheritance - “is a”): Circle - radius : double + Circle (...) + getRadius( ) : double + getArea( ) : double + setRadius(radius : double) : void

37. Class Diagrams • Generalization (Inheritance - “is a”): Circle GeometricObject

38. Class Diagrams • Generalization (Inheritance - “is a”): • Used to indicate inheritance relationship

39. Class Diagrams • Generalization (Inheritance - “is a”): Circle Rectangle GeometricObject

40. Class Diagrams • Aggregation (“has a”):

41. Class Diagrams • Aggregation (“has a”): • Class1 has a number of Class2

42. Class Diagrams • Aggregation (“has a”): • Class1 has a number of Class2 • Course has a number of Students • Course has manyStudents

43. Class Diagrams • Aggregation (“has a”): public Course { Student[] students = newStudent[capacity]; }

44. Class Diagrams • Aggregation (“has a”): public Course { Student[] students = newStudent[capacity]; } Student Course 0..capacity students

45. Class Diagrams • Aggregation (“has a”): • 0...capacity = number of students in the Course • “students” = the variable

46. Class Diagrams • Aggregation (“has a”): • 0...capacity = number of students in the Course • “students” = the variable • So aggregation indicated by empty diamond

47. Class Diagrams • Composition (“owns a”):

48. Class Diagrams • Composition (“owns a”): • Similar to Aggregation – but one class completely depends on the other.

49. Class Diagrams • Composition (“owns a”): • Similar to Aggregation – but one class completely depends on the other. • Destroying one also destroys the dependent class

50. Class Diagrams • Composition (“owns a”): Wheels Car 4 wheels