Question

Can any one please share their experience on
“When do we make a call to use between Synchronised method and Synchronised Block”
Any Performance Issues?

Answer 1

When do we make a call to use between Synchronised method and Synchronised Block.

If you want to lock for the duration of a method call AND you want to lock on this (or the current class, for a static method), then synchronized methods are the right solution.

If you are locking on something else (e.g. a private lock object or some internal data structure), then the synchronized block approach is better.

Similarly, if only some of the code in a procedure call needs to be done holding a lock, it is better to use a synchronized block and put just that code in the block.

Any Performance Issues?

None, apart from the general principal that it is a bad idea to hold a lock longer than you need to. (The longer a lock is held, the more likely it is that other threads will need to wait.)