多项选择题
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 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
G. Beagle has-a Jumper
相关考题
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多项选择题
Whichtwoaretrueabouthas-aandis-arelationships？（）
A. Inheritance represents an is-a relationship.
B. Inheritance represents a has-a relationship.
C. Interfaces must be used when creating a has-a relationship.
D. Instance variables can be used when creating a has-a relationship. -
多项选择题
Whichfouraretrue？（）
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. An array or a collection can be used to implement a one-to-many has-a relationship.
G. The relationship between Movie and Actress is an example of an is-a relationship. -
多项选择题
public class Team extends java.util.LinkedList { public void addPlayer（Player p） { add（p）； } public void compete（Team opponent） { /* more code here */ } } class Player { /* more code here */ } Which two are true？（）
A. This code will compile.
B. This code demonstrates proper design of an is-a relationship.
C. This code demonstrates proper design of a has-a relationship.
D. A Java programmer using the Team class could remove Player objects from a Team object.
