类设计与实现举例

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1、类设计与实现举例DesigningClasses:FromRequirementstoImplementationRequirementRequirementWhatclasses?•Nounsasclasses–quiz,question,problem,student,computer,keyboard,chanceMemberFunctions•VerbsasMemberFunctions(Methods)–Classbehavior•Publicmemberfunctions–Responsibility•Methodsassociatedwiththeclassa

2、ndtheinteractionsbetweenclassesFindingVerbsUsingScenariosEnterName,ChooseNumberOfQuestions,ChooseKindOfQuestion,RespondToQuestion,GetCorrectAnswer,GetScore,AskQuestion,ProvideFeedbackWhichoftheseverbsgoeswithwhichclass?AssigningResponsibilities•NotallresponsibilitieswillbeassignedtoaclassI

3、mplementingandTestingClassesImplementingtheClassQuiz•[JohnBentley1988]•howtheQuizknowswhichstudenttoask?•ItcorrespondstohowStudentobjectsaredefinedandused•Codeofgivingaquiztotwostudents•designthefunctionQuiz::GiveQuestionTo()ImplementingtheClassQuestionReference•http://www.cs.duke.edu/csed

4、/tapestry/final7.pdf