Java- volatile modifier / Chapter -10 / Access Modifier

1. "volatile" is a modifier applicable only for variable and we can't apply for methods & classes.
2. If a value of a variable keep on changing by multiple threads then there may be a chance of data inconsistency problem.We can solve this problem by using "volatile modifier".
3. If a variable declared as volatile then for every thread JVM will create a separate local copy.
4. Every modification performed by the thread will take place in the local copy so that there are no effects on remaining threads.
5. The main advantage of volatile keyword is we can overcome data inconsistency problem but the main disadvantage of volatile keyword is creating & maintaining a separate copy of every thread increases the complexity   of programming & create performance problems.Hence If there is no specific requirement it is never recommended to use volatile keyword.
6. final variable means the value never changes whereas volatile variable means the value keep on changing, the hence volatile final is an illegal combination for variables.

example:-
volatile final int x=10;  Invalid
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