<ul><li>In Java, each thread has its own working memory, which can cause discrepancies when sharing variables across threads.</li><li>Without the 'volatile' keyword, threads may not see the most recent value of a shared variable due to caching.</li><li>Using 'volatile' ensures that every read and write operation on a variable is visible to all threads.</li><li>Volatile fields in Java help in synchronizing the visibility of shared variables across threads.</li><li>Volatile doesn't provide atomicity; it only guarantees the visibility of the most recent value.</li><li>Volatile is useful for simple communication between threads, such as signaling the status.</li><li>Memory barriers are introduced by the JVM when dealing with volatile variables to control memory reads and writes.</li><li>Volatile alone is not sufficient for complex operations that require atomicity; atomic classes or locks are needed.</li><li>For scenarios where the whole process from read to write needs to be uninterrupted, volatile is not suitable.</li><li>In cases where atomicity is crucial, such as incrementing shared variables safely, volatile is not the appropriate solution.</li></ul>

The Meaning of Volatile Variables in the Java Memory Model

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