SCJP(OCPJP) 考古題解析 第２６題

Given:

interface Jumper { public void jump(); }

...

class Animal {}

...

class Dog extends Animal {
    Tail tail;
}

...

class Beagle extends Dog implements Jumper {
    public void jump() {}
}

...

class Cat implements Jumper {
    public void jump() {}
}

Which three are true? (Choose three.)



A. Cat is-a Animal
B. Cat is-a Jumper
C. Dog is-a Animal
D. Dog is-a Jumper
E. Cat has-a Animal
F. Beagle has-a Tail


答案：ＢＣＦ



解析：

畫個圖就清楚了