syncronized(this) is not working?

Question

Need to create a multiple user application in java with multiple insert at a time so i tried to maintain a queue using synchronized (this) in my program but it is not up to the mark. which will be the better option than synchronized. any help in this will be appreciated.

Answer 1

How about maybe using Semaphores? They're really nice when you need to give access to more than one thread. I don't really know a lot, just what I've learned in class. Hope It'll help!

Here's a link to an example info on semaphores