第34題

Which four statements are true? (Choose four.
)


A. Has-a relationships should never be encapsulated.
B. Has-a relationships should be implemented using inheritance.
C. Has-a relationships can be implemented using instance variables.
D. Is-a relationships can be implemented using the extends keyword.
E. Is-a relationships can be implemented using the implements keyword.
F. The relationship between Movie and Actress is an example of an is-a relationship.
G. An array or a collection can be used to implement a one-to-many has-a relationship.

答案：CDEG
參考：6-5 繼承
-------------------------------------------

Ans:
A: Has-a 跟封裝沒有關係
B: Has-a 不是繼承的關係
F: Movie and Actress 是 Has-a 的關係