问题:
Given:
10. interface Jumper { public void jump(); } ...
20. class Animal {} ...
30. class Dog extends Animal {
31. Tail tail;
32. }
...
40. class Beagle extends Dog implements Jumper{
41. public void jump() {}
42. }
...
50. class Cat implements Jumper{
51. public void jump() {}
52. }.
Which three are true?()
A . Cat is-a Jumper
B . Cat is-a Animal
C . Dog is-a Jumper
D . Dog is-a Animal
E . Beagle has-a Jumper
F . Cat has-a Animal
G . Beagle has-a Tail
Given:
10. interface Jumper { public void jump(); } ...
20. class Animal {} ...
30. class Dog extends Animal {
31. Tail tail;
32. }
...
40. class Beagle extends Dog implements Jumper{
41. public void jump() {}
42. }
...
50. class Cat implements Jumper{
51. public void jump() {}
52. }.
Which three are true?()
● 参考解析
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