Web Reference: Mar 17, 2026 · The volatile keyword in Java is used to ensure that changes made to a variable are immediately visible to all threads.It is commonly used in multithreading to maintain data consistency without full synchronization. Ensures visibility of shared variables across threads by preventing caching issues. The compiler, runtime, or processors may apply all sorts of optimizations. Although these optimizations are usually beneficial, typically without necessary synchronizations, they can cause subtle issues in the form of unexpected results. Caching and reordering are optimizations that may surprise us in concurrent contexts when we don’t synchronize c... The volatile keyword allows you to ensure that when you read the value that you get the current value and not a cached value that was just made obsolete by a write on another thread.
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