SCJP 1.6版考題 045

Gadget has-a Sprocket and
Gadget has-a Spring and
Gadget is-a Widget and
Widget has-a Sprocket

Which two code fragments represent these relationships? (Choose two)
  A. class Widget{Sprocket s;}
     class Gadget extends Widget{Spring s;}
  B. class Widget{}
     class Gadget extends Widget{Spring s1; Sprocket s2;}
  C. class Widget{Sprocket s1; Spring s2;}
     class Gadget extends Widget{}
  D. class Gadget{Spring s;}
     class Widget extends Gadget{Sprocket s;}
  E. class Gadget{}
     class Widget extends Gadget{Sprocket s1; Spring s2;}
  F. class Gadget{Spring s1; Sprocket s2;}
     class Widget extends Gadget{}

解答

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Ans: A C

解說: is-a繼承 , has-a 擁有