What is the use of the volatile keyword?

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The volatile keyword in Java is used to indicate that a variable's value will be modified by different threads. It ensures visibility of changes to variables across threads. When a variable is declared as volatile, every read of that variable will be read directly from the main memory, and every write will be written directly to the main memory.

Purpose of volatile:

1. Visibility: Normally, threads keep a local copy of variables for performance. This means changes made by one thread might not be visible to others. Declaring a variable as volatile ensures all threads see the most recent value.

2. Avoids Caching: The value is not cached thread-locally, so all threads read the updated value directly from the main memory.

3. Lightweight synchronization: It can be used instead of synchronized blocks for simple flag checks or status updates where atomicity is not needed.

Example:

java
class Example {
    private volatile boolean running = true;

    public void run() {
        while (running) {
            // do something
        }
    }

    public void stop() {
        running = false;
    }
}

In this example, if running wasn’t volatile, the run() method might never detect the change in running due to caching.

Limitations:

• It does not guarantee atomicity. For compound actions like count++, you still need synchronization.

• Use it only when one thread writes and others read.

In summary, volatile ensures that a variable's value is always visible to all threads, making it useful for flags or single-value updates in multithreaded environments.

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