hemasundar

 Profile Answers by hemasundar 

• Jan 1st, 2008

 

We use synchronized methods or synchronised blocks to make your application thread safe. 
You can use synchronized methods, but the problems may be:
1. It degrades the performance of your application.

2. Slows down the your program because synchronozation restricts concurrency.

3. Synchronized methods can lead to dead lock.

To avoid the problem(s), we can use synchronized blocks within a method. You choose areas of methods(for example,may be call to another methods) use synchronozed block, but  in this case you've to provide an argument that is the object whose key the thred needs to get.
 see the example
 
           public void doIt(){
             ........................................
             ........................................
                   synchronized(this){
                      criticalData();
                      moreCriticalData();
                    }
             ........................................
             ........................................

        }