SCJP題庫第045題

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{}

Ans:A  C

解說:

is-a繼承

has-a 擁有