1. Class Diagram

2. Definition depict the classes within a model
classes have attributes (member variables), operations (member functions) and relationships with other classes
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3. Class Diagram Class Relationships Class name Attribute Operation
Generalization
Association
Aggregation
Dependency

4. Class It’s a rectangle divided into three compartments. Name
Attributes
Operations
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5. Class Name Required Appears in the top-most compartment unique
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6. Attributes property of a class, describes the object being modeled.
Person
name : String
address : Address
birthdate : Date
ssn : Id
property of a class, describes the object being modeled.
appear in the second compartment
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7. Attributes Visibility Name Data Type [default value]
Public +
Private –
Protected #
Package ~
Name
Data Type
[default value]
Visibility name : type = initial value {constraints}
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8. Attributes Derived attribute: Example: age and birth date / age : Date
can be computed from other attributes
doesn’t actually exist.
designated by a preceding ‘/’
Example: age and birth date
/ age : Date
+Wieght : int = 850
Person
name : String
address : Address
birthdate : Date
/ age : Date
ssn : Id
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9. Operation the class behavior
Person
name : String
address : Address
birthdate : Date
ssn : Id
eat
sleep
work
play
the class behavior
signature: name, type, and default value of all parameters, and, a return type.

10. Operation Operation name Arguments Return type Name Type
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11. Depicting Classes
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12. Example

13. Class types
Boundry (usecase – actor): boundary of the system and other system or user
Entity (Table): has data
Control (usecase): few attribute

14. Relationships Relationships Generalization Association Aggregation
Dependency

15. Generalization
A relationship between a general thing sand a more specific kind of that thing
“is-a-kind-of” relationship

16. Association
A structural relationship that specifies that objects of one thing are connected to objects of other
Communicate
Multiplicity
One-to-One
Many-to-One
Many-to-Many
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17. Association

18. Reflexive Association
LinkedListNode
next
previous

19. Reflexive Association

20. Aggregation "has a" association relationship
 represents a part-whole or part-of relationship
 when a class is a collection or container of other classes
the contained classes do not have a strong life cycle dependency on the container

21. Aggregation
Car
Engine
Transmission

22. Composition "owns a” association relationship
Composition usually has a strong life cycle dependency between instances of the container class and instances of the contained class

23. Composition

24. Dependency
Change in specification of one class can change the other class. This can happen when one class is using another class.

25. Examples