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This page is meant to answer frequently asked questions regarding object oriented design principles, design patterns, refactoring etc. See also DesignPatternFaq and OoPatternsUmlRefactoringFaq.

  • Where on the net do I find information on OO design?

  • See OoDesignLinks

  • What are good books on object oriented design?


  • See OoDesignBooks

  • How do I come up with a design?


  • See HowToDesign

  • Why should I use accessor methods (getters/setters)?


  • See AccessorMethods

  • What is the definition (differences) of the following terms:

  • BusinessObject (aka DomainObject)
    ValueObject
    DataTransferObject
    DataAccessObject
    ImmutableObject

  • What is the difference between Association, Aggregation and Composition?


  • AssociationVsAggregationVsComposition

  • When should I use an interface, when an abstract class?

  • InterfaceVsAbstractClass


    Questions from IBM Sample Test

  • Which of the following are recommended when developing an OO system?


  • http://www.coderanch.com/t/96601/patterns/help-IBM-test
  • http://www.coderanch.com/t/98174/patterns/clarifications-ICE-questions
  • http://www.coderanch.com/t/98286/patterns/One-Sample-Test





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    It is sorta covered in the JavaRanch Style Guide.
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