When Synchronization Is Used in Java?

Synchronization in java is the capability to control the access of multiple threads to any shared resource. In the Multithreading concept, multiple threads try to access the shared resources at a time to produce inconsistent results. The synchronization is necessary for reliable communication between threads.

Where is synchronized used in Java?

A synchronized block in Java is synchronized on some object. All synchronized blocks synchronized on the same object can only have one thread executing inside them at a time. All other threads attempting to enter the synchronized block are blocked until the thread inside the synchronized block exits the block.

When should synchronization be used?

Synchronization is usually needed when you are sharing data between multiple invocations and there is a possibility that the data would be modified resulting in inconsistency. If the data is read-only then you dont need to synchronize. In the code snippet above, there is no data that is being shared.