Sunday, April 22, 2012

Java Covariant, Contravariant 

    List<T>                                    T  
      Λ                                        Λ 
      |                       if               |
      |                                        |
List<? extends T>                              ?


    List<T>                                    ?  
      Λ                                        Λ 
      |                       if               |
      |                                        |
List<?  super  T>                              T
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