volatile : Java Glossary

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volatile
The volatile keyword is used on variables that may be modified simultaneously by other threads. This warns the compiler to fetch them fresh each time, rather than caching them in registers. This also inhibits certain optimisations that assume no other thread will change the values unexpectedly. Since other threads cannot see local variables, there is never any need to mark local variables volatile. You need synchronized to co-ordinate changes to variables from different threads, but often volatile will do just to look at them. volatile does not guarantee you atomic access, e.g. a ++;
synchronized
thread
thread safe code
transient
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