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Object Oriented Design

Object Oriented Design. Object-Oriented Design. Method for designing computer programs Useful for thinking about large problems Consider “objects” interacting in the program Example: a zoo, a gradebook. Objects. Objects have state – what they know

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Object Oriented Design

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  1. Object Oriented Design

  2. Object-Oriented Design • Method for designing computer programs • Useful for thinking about large problems • Consider “objects” interacting in the program • Example: a zoo, a gradebook

  3. Objects • Objects have state – what they know • Objects have behaviors – what they can do • Example: Car

  4. Classes • A programming construct to define the state and behaviors of a particular type of object • A class is the blueprint • An object is an instance of the class

  5. CRC Cards • Class, Responsibilities, Collaborators (CRC) • The CRC card method is a mechanism for discovering the classes that will be part of a program.

  6. Example: A Card Gamehttp://max.cs.kzoo.edu/AP/OOD/OODPresentation/CRC4.html • Classes: Card, Deck, Hand, Dealer • Class: Card • Responsibilities: • Display self • Report suit • Report rank • Collaborators • None

  7. Example: A Card Gamehttp://max.cs.kzoo.edu/AP/OOD/OODPresentation/CRC4.html • Classes: Card, Deck, Hand, Dealer • Class: Deck • Responsibilities: • Shuffle • Deal • Report size • Collaborators • Contains cards

  8. Exercises • Form groups of 2 or 3 and use the CRC method to design a coffee machine. Start with a coffee machine that can dispense black coffee or coffee with cream. Each costs 1.00.

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