aspose file tools
The moose likes Programmer Certification (SCJP/OCPJP) and the fly likes Thread Safe Code Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login

Win a copy of The Software Craftsman this week in the Agile forum!
JavaRanch » Java Forums » Certification » Programmer Certification (SCJP/OCPJP)
Bookmark "Thread Safe Code" Watch "Thread Safe Code" New topic

Thread Safe Code

Kousik Majumder
Ranch Hand

Joined: Sep 30, 2007
Posts: 234

Is the class Thread Safe?
If not how can I make that one Thread Safe?

Thanks in Advance,
Gaurav Bhatia
Ranch Hand

Joined: Jan 01, 2007
Posts: 49
The class is NOT thread safe.

Reason : If two instances of the same class are created, it will create two different threads. Now, if both threads are calling this method doThings() which is synchronized, they are getting lock on their respective object and not on the "Class object".
And a static variable is being shared between both the instances.
To make this thread safe, a lock on the .Class instance should be acquired because only one .class instance exists.

You can also make doThings as a static synchronized method.

Hope this clarifies.

~Gaurav<br />SCJP5
Have you tried LearnNowOnline?
subject: Thread Safe Code
Similar Threads