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Stoop ed-dual interface

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    Stoop ed-dual interface Stoop ed-dual interface Presentation Transcript

    • Design Points - Dual Interfaces
      • Stéphane Ducasse --- 2005
    • Clients?
      • Clients
      • Subclasses
    • What are the consequences?
      • A
        • { private x ;
        • void foo(){ ... x ...}
        • }
    • What can I do as a subclass?
      • I cannot access x
      • I cannot replace x
      • I cannot extend!
    • The idiom is
      • Fields are private AND you provide protected accessors
      • OR
      • Fields are protected
    • Benefits
      • Your clients cannot access your fields
      • But your subclasses are empowered
    • Two users
    • Two Users
    • Clients
      • A class has always two clients:
        • its clients and its extenders