This document discusses key concepts in object-oriented modeling including classes, attributes, methods, and relationships. Classes can represent either concrete real-world entities or abstract concepts. Attributes and methods define the properties and behaviors of classes. Relationships between classes like generalization, aggregation, composition, and association describe different types of dependencies. Class diagrams provide a visual representation of these concepts and can be used along with techniques like CRC cards to document system designs.

2. 





3. 


4. Classes
Attributes
Methods
Relationships

5. Classes
Objects
1.Solid Classes



6. Classes 2
2.Conceptual Classes



7. Classes 3
Real World Classes


8. Attributes
Methods

9. Attributes




10. Methods



12. Relationships

object oriented
(
Generalization
Aggregation
Association

13. Classes
13
Inheritance:
is–ageneralizationclasses
class B
class A
is-a

14. Generalization
Inheritance
Super class
Sub class
is - a type of
Professor is a type of Person
Student is a type of Person

15. Generalization 2
Specialization
Globalization

16. 









18. Aggregation

 Aggregation can occur when a class is a collection or
container of other classes
class A class B
aggregation

19. 2Aggregation

part of

contained in

participate in


20. Aggregation 3

21. Composition
Composition (filled diamond) is a whole-part relationship where the
'whole' (end with the black diamond) 'contains' the part. It imposes
two key restrictions:
There can only be 1 container (i.e. cardinality at whole end is
exactly 1(;
It imposes a lifecycle responsibility for parts on the whole. So the
container is responsible for creating and deleting parts. A part
cannot continue to exist if its container is deleted.
class A class B
class A class B
composition
generalization

22. Composition
Customer
- customerID : Long
+ customerName : String
+ createOrder(( : Order
Order
- orderID : Long
- shipped : Boolean
- date : Date
- minimumWeight : Double
+ calcSubTotal(( : Currency
+ calcTax(( : Currency
+ calcTotal(( : Currency
+ calcTotalWeight(( : Double
+ setShipmentDate(d : Date( : void
0..n1 0..n1
-orders

23. Composition
Aggregation

25. Association

 An association represents a family of links




class A class B
association

26. Association 2
class B class Ahas-a

27. Classes Documentation





28. Class Responsibility Collaboration
CRC






29. Class Responsibility Collaboration
CRC
Class Name: Student ID:01 Type: General
Description: This Class represents a general student class
Responsibilities Collaboration
Login to Reg System String
Register for Courses Network and Connection
Know the offered Course
Attributes:
Number, Name, Year
Relations
Course
Instructors
Other associations
Part Time Student

30. Class Diagrams






1: exactly one
0..*: zero or more
1..*: one to more
0..1: zero or one
2..4: specified range
1..3,5: multiple, disjoint

31. class diagram
31

classesclasses or ObjectsOOobjects

32. Lecturer
EducationalLevel
Num
Add()
Update()
(from Use Case View)
Student
Specialty
Num
Add()
Update()
(from Use Case View)
Person
ID
Name
Delete()
(from Use Case View)
Courses
ID
StudentID
LecturerID
SemesterID
AddStudent()
AddLecturer()
(from Use Case View)
1..*1 1..*1

33. Class Diagram Notations inUML
33
Order
- shipped : Boolean
- date : Date
- minimumWeight : Double
+ cancel() : void
+ calcSubTotal() : Currency
+ calcTax() : Currency
+ calcTotal() : Currency
+ calcTotalWeight() : Double
+ setShipmentDate(d : Date) : void
Class Name
Attributes
Properties
Operations
Methods
Private
Static
Public
Parameters
Return Values

34. 34