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CPSC 233 Tutorial

CPSC 233 Tutorial. Xin Feb 7, 2011. Object Oriented Design. Gathering requirements Finding the classes Finding the attributes Finding the methods. ATM -- requirements. A user has only one account A user can view balance, withdraw, and deposit

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CPSC 233 Tutorial

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  1. CPSC 233 Tutorial Xin Feb 7, 2011

  2. Object Oriented Design • Gathering requirements • Finding the classes • Finding the attributes • Finding the methods

  3. ATM -- requirements • A user has only one account • A user can view balance, withdraw, and deposit • Cash dispenser begins each day loaded with 500 $20 bills. • Simulate the process inside a computer screen keypad cash dispenser deposit slot

  4. Use case diagram • A type of UML diagram (among 13) • show the kinds of interactions

  5. Identifying the classes • Derived from key nouns and noun phrases • Pick out important and relevant candidacies

  6. Have-a relationship • a bit different from that in Prof. Tam’s slides

  7. Class diagram with Withdrawal

  8. Class diagram with Deposit

  9. Finding attributes • Derived from descriptive words and phrases that refer to characteristics of the classes • Pick out the important words and phrases

  10. descriptive words

  11. Class Attributes

  12. Finding methods • Derived from key verbs and verb phrases • determine methods • some methods need cooperation of more than one classes • determine parameters • determine return types

  13. verbs

  14. methods

  15. The end • Thank you!

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