单项选择题

23. Object [] myObjects = {
24. new integer（12），
25. new String（”foo”），
26. new integer（5），
27. new Boolean（true）
28. }；
29. Arrays.sort（myObjects）；
30. for（ int i=0； i31. System.out.print（myObjects[i].toString（））；
32. System.out.print（” “）；
33. }
What is the result？（）

A. Compilation fails due to an error in line 23.
B. Compilation fails due to an error in line 29.
C. A ClassCastException occurs in line 29.
D. A ClassCastException occurs in line 31.
E. The value of all four objects prints in natural order.

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单项选择题

public class Person {
private name；
public Person（String name） {
this.name = name；
}
public int hashCode（） {
return 420；
}
}
Which is true？（）

A. The time to find the value from HashMap with a Person key depends on the size of the map.
B. Deleting a Person key from a HashMap will delete all map entries for all keys of typePerson.
C. Inserting a second Person object into a HashSet will cause the first Person object to beremoved as a duplicate.
D. The time to determine whether a Person object is contained in a HashSet is constant and does NOT depend on the size of the map.

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 }

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.