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Is the question about code implementation of synchronization in java or know-hows of internal implementation.

Synchronization is internally implemented using Monitors, Monitor can be on class variables, INstance variable or any Non-Null object.

Synchronization in Java is done using the Monitor. The idea is that when multiple threads are accessing a shared resource like a data structure, then only one thread can manipulate the contents of the resource. The rest of the threads have to wait till the thread has finished manipulation. Monitors are implemented using the objects. To enter an objects monitor, call a method that has been modified by the synchronized keyword.