Passed SCJD 2.3.2 B&S 336/400

[Werner Joerling]

Hi all,
just I got my result. Of course I'm happy to have passed but the score is disappointingly low, especially the GUI section.
Furthermore I waited for my result since March 29.
Here are images of my GUIs. Can someone explain me what is wrong with them?

 
General Con   : 100  80 
Documentation :  70  64 
OOD           :  30  30 
GUI           :  40  12 
Locking       :  80  80 
Data Store    :  40  40 
Network Server:  40  30 
Total         : 400 336  

Thanks to all here.
Werner

[Hanna Habashy]

Congratulation Werner
Your score is not bad, I wish I just can pass with the same score

[Baris Dere]

Congratulation Werner,
A good score.
When I saw your client GUI, I couldn't see your book button. When I looked becarfully I saw it. Maybe due something like this.
So now hope I can pass ;-)
Success with your next examen.
Baris Dere

[Baris Dere]

Werner,
How did you implement locking mechanism?
Can you tell us a bit about it?
Thanks
Baris Dere

[Werner Joerling]

Originally posted by Baris Dere:

How did you implement locking mechanism?

I did the locking mechanism similar to that in Mehran Habibi's book. There isn't a lock manager, but rather a

private static java.util.Set lockedRecords = new java.util.HashSet();

intended to store the locked records.
All record access methods (read, find, create, delete, update) in the Data class are synchronized by the method modifier 'synchronized'.
('create' and 'delete' aren't really implemented, they simply throw UnsupportedOperationException).
The lock methods (lock, unlock, isLocked) are using synchronized blocks

synchronized(lockedRecords) { ... }

and the 'unlock' mehod calls

lockedRecords.notifyAll();

when recNo has been removed.
The single record access methods (read, update, delete) throw IllegalStateException if the recNo isn't locked.
The bulk record access method 'find' uses lock/read/unlock inside a loop over all records and skips deleted records.
There is a middle tier (locally or remotely accessible) between the clients
and the DBMain interface that implements the high level methods 'book' and 'search' and ensures the correct use of the lock/unlock protocol (db is of type DBMain).

try {
   db.lock(recNo);
   //process recNo
} finally {
   db.unlock(recNo);
}

Werner
[ May 12, 2004: Message edited by: Werner Joerling ]

[Andrew Monkhouse]

Congratulations Werner
Your GUIs looked fine to me - there are some things I would do differently, but nothing major.
Since you are using the platform L&F there may have been something odd happen when run on a different platform (unlikely, but possible).
Does your screen resize nicely?
Regards, Andrew

[Philippe Maquet]

Congratulations, Werner!

[Baris Dere]

Thank you Werner

success

[Vishwa Kumba]

Congratulations!

Originally posted by Werner Joerling:
All record access methods (read, find, create, delete, update) in the Data class are synchronized by the method modifier 'synchronized'.
('create' and 'delete' aren't really implemented, they simply throw UnsupportedOperationException).

Empty create()/delete() methods are a bit tempting!
[ May 13, 2004: Message edited by: Vishwa Kumba ]

[Andrew Monkhouse]

Moved to the Sun Certification Results forum. You can now find this post here.

[Nicholas Cheung]

Congrad!!!

Your Locking score is PERFECT!

You did a good job!!!

Nick

[Hari Vignesh Padmanaban]

Congrats !!!