Object Interaction Diagrams

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Object Interaction Diagrams

• CSC 422
• Kutztown University
• Dr. Spiegel

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Use Case Diagram

• Lays out the use cases in a system
• Shows actors and the different system actions in
  which they are participants
• Provides an overall picture of the interactions
  within a system

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Use Case Diagram
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Object Interaction Diagrams

• Collaboration
• Sequence

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Collaborations

• What is a collaboration?
• An arrangement of objects within a context
• Properties
• The collaboration is aimed at achieving some goal
• Object (possibly) fulfills a predefined role
• A single object may fulfill more than one role
• Roles are only meaningful within their context
• A parameterized collaboration is a pattern
• Collaboration diagram
• Shows Interaction between the participating
  objects
• Relationships are indicated by arrows (messages,
  composition, )
• Time is indicated by sequence number

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Sequence Diagrams

• Describe how groups of objects interact
• Shows messages passed between objects over time
• Properties
• Captures the behavior of a single scenario
• Most popular way for representing a use-case
• Actually shows the same information as a
  collaboration diagram
• Sequence diagrams (SD) vs. Collaboration Diagrams
  (CD)
• SD Shows time clearly object relationships are
  implicit
• CD Shows object relationships clearly time has
  no visual representation

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Validate User (Administrator)
19
Change Password (Administrator)
20
Register Course (Administrator)
21
Drop Course (Administrator)
22
Add Course (Administrator)
23
Remove Courses (Administrator)
24
List Students (Administrator)
25
Student Details (Administrator)
26
Add Account (Administrator)
27
Delete Account (Administrator)
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View Transcript (Administrator)