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What is volatile variable in java. When it can be useful.

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volatile is used to indicate that a variable's value will be modified by different threads. Value will not be stores in thread cache. All the operations will work with the main copy. Its acts as it is in a synchronized block.
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volatile variable in Java is a special variable which is used to signal threads, compiler that this particular variables values is going to be updated by multiple thread inside Java application. By making a variable volatile using volatile keyword in Java, application programmer ensures that its value...
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volatile variable in Java is a special variable which is used to signal threads, compiler that this particular variables values is going to be updated by multiple thread inside Java application. By making a variable volatile using volatile keyword in Java, application programmer ensures that its value should always been read from main memory and thread should not used cached value of that variable from there own stack. When to use Volatile variable in Java This is the most important thing to learn while learning about volatile variable in Java. When to use volatile variable in Java is also a famous multi-threading interview question in Java. here are some of the scenario where you can use volatile variable in Java : 1) Any variable which is shared between multiple threads should be made variable, in order to ensure that all thread must see latest value of volatile variable. 2) A signal to compiler and JIT to ensure that compiler does not change ordering or volatile variable and moves them out of synchronized context. 3) You want to save cost of synchronization as volatile variables are less expensive than synchronization. read less
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http://java67.blogspot.in/2012/08/what-is-volatile-variable-in-java-when.html
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http://java.dzone.com/articles/java-volatile-keyword-0
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