Java synchronized modifier
1." synchronized" is a modifier applicable for methods and blocks but not for classes and variables.
2.If multiple threads are trying to operate simultaneously on the same java object then, there may be a chance of data inconsistency problem.This is called "Race Condition".We can overcome this problem by using synchronized keyword or modifier.
3.If a method or block declared as synchronized then at a time only one thread is allowed to execute that method or block on the given objects so that data inconsistency problem won't come.
4.But the main disadvantage of "synchronized" modifier is, it increasing waiting time of the threads & creates performance problems.hence if there is no specific requirement then it is not recommended to use synchronized keyword.
5.synchronized method compulsory contains implementation whereas abstract method doesn't contain any implementation hence "abstract synchronized" is an illegal combination of methods.
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