檢視 SCJP 1.6版考題 034 的原始碼

 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. 

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<span style="font-size: medium;">Ans: C D E G   </span>

<span style="font-size:medium;"> 解說:
 那四個敘述是正確的？
   Has-a 關係應該永遠不能被封裝
   Has-a 關係應該以繼承的方式實作
   Has-a 關係可以用物件變數的方式被實現出來
   Is-a關係可用extends關鍵字實現出來
   Is-a關係可用implements關鍵字實現出來
 電影和女演員間的關係是一個Is-a關係的例子
 一個陣列或一個集合可以被用來實作一對多的has-a關係
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{{SCJP 1.6版考題講解}}