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Volatile variable have some specific uses.It's better to know all the major reason  why java adopt such variables .Please found the below 10 points which need to be noticed: 1.Volatile variable always get allocated in the main memory.To allocate any variable in main memory volatile keyword is used. 2.Precisely volatile variable are always read and write directly from main memory.It doesn't perform any operation from CPU 's cache. 3.Volatile variable after JAVA 5 guranatees the visibilty of changes to variable across multiple threads. 4.Volatile also provide atomicity in some cases e.g .while reading double and long data types. 5.In case of volatile long and  volatile double data types which are of 64 bytes the read operation is atomic. 6. If you know that a long field is accessed by more than one thread e.g. a counter or anything, you better make it volatile. Why? because reading to a long variable is not atomic in Java and done in two steps, If one thread is w