UML Class Diagrams Sequence Diagrams

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UML Class DiagramsSequence Diagrams

• CS2335
• Summer 2002

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Agenda

• Class Diagrams
• Symbology
• Basic Modeling
• Intermediate Modeling
• Sequence Diagrams
• Symbology

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Class Diagrams

• A class diagram shows
• Classes
• Attributes
• Methods
• Interfaces
• Collaborations
• Dependency, Generalization, Relationships
• A class diagram is a STATIC view of system

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Basic Class Diagrams
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Basic Class Diagrams
public protected - private / derived
static
Abstract ltltabstractgtgt
ltltconstructorgtgt ltltquerygtgt ltltupdategtgt
Class Scope Variable
Visibility Attribute Name MultiplicityType
Initial Value Visibility Method Name (Parameter
List) Return-List
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Basic Class Diagrams
Superclass
Class with parts
Note
Assembly Class
Subclass
Composition (Part-Of)
Association (relationship)
Inheritance (Generalization) (is-a, kind-of)
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Basic Class Diagram (Example)
takes
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Basic Class Diagram (Example)
Person
name String - ssn String birthday
Date / age int
getName String -calculateAge int
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Class Diagrams (Advanced)
Cardinality (Multiplicity) 1 0..1 0..n 1..n

takes
0..n
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Class Diagrams (Advanced)
Important Stereotypes ltltinterfacegtgt specify
collection of operations to specify
services ltlttypegtgt specify structure and
behavior (not implementation) ltltenumerationgtgt
specify discrete values ltltimplementationClassgtgt
helper class created in detail design
ltltenumerationgtgt Status
Idle Working Error
Fundamental Attributes
readImage writeImage
Fundamental behavior
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Class Diagrams (Advanced)
Simple Aggregation (object lifetime)
Composite Aggregation (unique member)
Can have self-relations
Exception handling
ltltsendsgtgt
manager
manages
employee
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Class Diagrams (Advanced)
Association Class
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Class Diagram Hints

• Provide abstraction of problem domain
• Embodies small set of well-defined
  responsibilities
• Clear separation between specification and
  implementation
• Understandable and simple
• Show only important properties

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Class Hints

• Organize similar classes into packages
• Beware of cyclical generalization
• Use associations where there are structural
  relationships
• Associations are NOT comm pipes!!!!!!!
• Start with Analysis, then refine details

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Bitman Class Diagram
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Sequence Diagrams

• AKA Interaction Diagrams Semantically
  equivalent to Collaboration Diagrams
• Dynamic Model relating use cases and class
  diagrams
• Shows time ordering of interactions
• Generally a set of messages between collaborating
  objects
• Ordering of objects not significant

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Sequence Diagrams

• Show only one flow of control
• May need multiple diagrams
• Primary
• Variant
• Exceptions

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Sequence Diagram (Basic)
Swimlane
Object Class or Actor
name
Focus of Control/ Activation
message
Object Destruction/ Termination
X
ltltcreategtgt ltltdestroygtgt
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Sequence Diagram (Basic) Example
aClass Class
Register
adjustRoom
checkRooms
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Sequence Diagrams (Advanced)
Seq Guard Iteration Return-List
Operation-Name (Argument-List)
Conditional Lifeline
transient
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Sequence Diagrams (Advanced) Example
ob1 C1
User
run(v)
ltltcreategtgt
xgt0 foo(x)
doit(w)
xlt0 bar(x)
7doit(z)
ltltdestroygtgt
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Sequence Diagram (Hints)

• Can show either objects or processes
  (ltltprocessgtgt) in swimlanes
• Use multiple diagrams to show variations
• Use advanced features sparingly to keep diagram
  understandable

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Lab 4 Exercise