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required lock and unlock methods.

Michael Ciaccio

Joined: Apr 14, 2002
Posts: 6
From my understanding of threads the synchronized key word provides the locking mechanism. The SCJD assignment from SUN requires the implementation of the lock(int record) and unlock(int record). I have searched the web using google, the usenet news groups
using google groups, several java text books I have and this forum. I am looking for an example or tutorial that has java code demonstrating the concept the SCJD exam requires. Please point me to a tutorial, faq, or java source code that demonstrates this concept. Thank you in advance for your help.
Mark Spritzler

Joined: Feb 05, 2001
Posts: 17276

Synchronized locks the object for the period of the method call. That is not a lock on the record while the user is using it to read then modify.
Have you searched on "lock" in this forum. It says you have, but there are a pleathora (Spelling?) of posts here that show you what the code can look like.
Basically you want to track which records the user has locked, and allow them to unlock the records that they have locked. While Synchronize keyword is used when you are calling the method, it doesn't relate to locking a record.

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subject: required lock and unlock methods.
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