SCJP(OCPJP) 考古題解析 第３２題

Given:

class Mammal {}

class Raccoon extends Mammal {
    Mammal m = new Mammal();
}

class BabyRaccoon extends Mammal {}

Which four statments are true? (Choose four.)

A. Raccoon is-a Mammal.
B. Raccoon has-a Mammal.
C. BabyRaccoon is-a Mammal.
D. BabyRaccoon is-a Raccoon.
E. BabyRaccoon has-a Mammal.
F. BabyRaccoon is-a BabyRaccoon.


答案：ＡＢＣＦ



解析：

也是畫圖就清楚了