aspose file tools*
The moose likes Mock Exam Errata and the fly likes Sierra/Bates mock for 5.0 question 11 Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login
JavaRanch » Java Forums » Certification » Mock Exam Errata
Bookmark "Sierra/Bates mock for 5.0 question 11" Watch "Sierra/Bates mock for 5.0 question 11" New topic
Author

Sierra/Bates mock for 5.0 question 11

Steve Weber
Greenhorn

Joined: Sep 29, 2005
Posts: 1
I found a mock exam online somewhere supposedly from the upcoming java 5.0 certification book by K&B containing the following question. The correct answers are supposed to be A, E, and F, but I don't see how E or F could be correct since the sets are untyped, and even if they were, then why wouldn't D be correct? And furthermore, although i can beleive that B is wrong, i could use an explanation as to exactly why.

11. Given:

1. import java.util.*;
1. import java.util.*;
2. public class Fruits {
3. public static void main(String [] args) {
4. Set c1 = new TreeSet();
5. Set o1 = new TreeSet();
6. bite(c1);
7. bite(o1);
8. }
9. // insert code here
10. }
11. class Citrus { }
12. class Orange extends Citrus { }

Which, inserted independently at line 9, will compile? (Choose all that apply.)

A). public static void bite(Set<?> s) { }
B). public static void bite(Set<Object> s) { }
C). public static void bite(Set<Citrus> s) { }
D). public static void bite(Set<? super Citrus> s) { }
E). public static void bite(Set<? super Orange> s) { }
F). public static void bite(Set<? extends Citrus> s) { }
G). Because of other errors in the code, none of these will compile.


The original mock exam can be found at http://www.javabeat.net/javabeat/scjp5/mocks/index.php?page=mock2


--Steve Weber
Marcin Skrzek
Ranch Hand

Joined: Oct 19, 2005
Posts: 38
Hi Steve,

I think there is mistake in the question. I`ve found the same question, where lines 4. and 5. are slightly different, but given answers are the same -A,E,F.

1. import java.util.*;
2. public class Fruits {
3. public static void main(String [] args) {
4. Set<Citrus> c1 = new TreeSet<Citrus>();
5. Set<Orange> o1 = new TreeSet<Orange>();
6. bite(c1);
7. bite(o1);
8. }
9. // insert code here
10. }
11. class Citrus { }
12. class Orange extends Citrus { }

Does it solve the problem?


SCJP 5, SCWCD 1.4, SCBCD 5
Bert Bates
author
Sheriff

Joined: Oct 14, 2002
Posts: 8829
    
    5
Marcin and Steve -

Marcin's got it! We originally had a little disagreement between HTML and the generics < > :roll:

we re-posted the corrected question on the site

thanks!


Spot false dilemmas now, ask me how!
(If you're not on the edge, you're taking up too much room.)
Marcus Green
arch rival
Rancher

Joined: Sep 14, 1999
Posts: 2813
I think you should look twice at all web based questions with Generics because the angle brackets are going to play merry hell with a lot of mock exams


SCWCD: Online Course, 50,000+ words and 200+ questions
http://www.examulator.com/moodle/course/view.php?id=5&topic=all
 
I agree. Here's the link: http://aspose.com/file-tools
 
subject: Sierra/Bates mock for 5.0 question 11