A Student Guide to Object-Oriented Development

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A Student Guide to Object-Oriented Development

• Chapter 10 Designing objects and classes

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Detailed design activities

• Revisit class diagram to add implementation
  details
• Revisit interaction diagrams to add
  implementation detail

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Class diagram

• Add new classes e.g. interface and control
  classes
• Specify technical details of associations between
  classes
• Specify visibility of classes, attributes and
  operation
• Specify attributes in detail
• Specify operations in detail

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Different types of classes

• Entity classes
• Boundary classes
• Control classes

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Entity classes

• Model features of the problem domain e.g. bikes,
  customers, hires
• Also known as domain or application classes
• All of the classes so far have been entity classes

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Boundary classes

• Model the systems interface with its actors
• Used to capture user input and present results

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Control classes

• Control the sequencing of events (e.g. in the
  execution of a use case scenario)
• In a system of any size we expect a boundary and
  a control object for each use case

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Attribute signature Bike class attribute -
deposit

• deposit Integer 0

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Operation signatureBike class - findBike(bike)

• findBike(bike Integer) Bike

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Wheels collaboration diagram for use case
Maintain Bike, Add new bike scenario

• Control object MaintainBike added
• Interface object MaintainBikeUI added

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Collection class in use

• Sequence diagram showing how the collection class
  works

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Sequence diagrams object creation and deletion

• the interface object MaintainBikeUI is created
  and destroyed in this interaction

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Sequence diagrams iteration
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Sequence diagrams iteration

• everything inside the rectangle is repeated while
  there are more bikes to add

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Sequence diagrams conditional behaviour and
branching

• conditions should be mutually exclusive

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Wheels design sequence diagram