Object-Oriented Design Strategies

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Steps in OO design: 2 Refine behavioural description into components● Each component holds a set of related tasks● Components relatively isolated, self-contained!● Components have thinly-coupled interactions e.g., CIM components:● Main menu / “greeter”● Database back-end; links● Pastors' access● Donations● OutputMenuPastorsDonationsOutputDatabaseDB LinkCMPT166: OO design 21 Jan 20086
Factoring: defining components Suggestion: use 3x5” index cards, one for eachcomponent● Name of component● Primary responsibility● Collaborating components If it won't fit on a 3x5” card, it's too complex toimplement!● Break it down into smaller components Write down every design decision, including pros/cons Postpone implementation detail decisionsCMPT166: OO design 21 Jan 20087
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Object-Oriented Design Strategies

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