单项选择题

Which Man class properly represents the relationship “Man has a best friend who is a Dog”？（）

A. class Man extends Dog { }
B. class Man implements Dog { }
C. class Man { private BestFriend dog； }
D. class Man { private Dog bestFriend； }
E. class Man { private Dog }
F. class Man { private BestFriend }

相关考题

Assume that country is set for each class. Given： 10....

多项选择题

Assume that country is set for each class.
Given：
10. public class Money {
11. private String country， name；
12. public getCountry（） { return country； }
13.}
and：
24. class Yen extends Money {
25. public String getCountry（） { return super.country； }
26. }
27.
28. class Euro extends Money {
29. public String getCountry（String timeZone） {
30. return super.getCountry（）；
31. }
32. }
Which two are correct？（）

A. Yen returns correct values.
B. Euro returns correct values.
C. An exception is thrown at runtime.
D. Yen and Euro both return correct values.
E. Compilation fails because of an error at line 25.
F. Compilation fails because of an error at line 30.

public class CreditCard { private String cardlD； priv...

单项选择题

public class CreditCard {
private String cardlD；
private Integer limit；
public String ownerName；
public void setCardlnformation（String cardlD，
String ownerName， 28. Integer limit） {
this.cardlD = cardlD；
this.ownerName = ownerName；
this.limit = limit；
}
}
Which is true？（）

A. The class is fully encapsulated.
B. The code demonstrates polymorphism.
C. The ownerName variable breaks encapsulation.
D. The cardlD and limit variables break polymorphism.
E. The setCardlnformation method breaks encapsulation.

10. interface Foo {} 11. class Alpha implements Foo {}...

单项选择题

10. interface Foo {}
11. class Alpha implements Foo {}
12. class Beta extends Alpha {}
13. class Delta extends Beta {
14. public static void main（ String[] args） {
15. Beta x = new Beta（）；
16. // insert code here
17. }
18. }
Which code， inserted at line 16， will cause a java.lang.ClassCastException？（）

A. Alpha a = x；
B. Foo f= （Delta）x；
C. Foo f= （Alpha）x；
D. Beta b = （Beta）（Alpha）x；

SCJP程序员认证考试

Which Man class properly represents the relationship “Man has a best friend who is a Dog”？（）