public class VolatileExample {
    // Declare a volatile variable
    private volatile boolean flag = true;

    public void changeFlag() {
        // This method is called by one thread to change the value of the flag
        this.flag = false;
        System.out.println("Flag has been set to false.");
    }

    public void runLoop() {
        // This method is called by another thread which keeps running until the flag becomes false
        System.out.println("Waiting for flag to become false.");
        while (flag) {
            // Busy wait - the loop will keep running as long as flag is true
        }
        System.out.println("Flag is now false, stopping the loop.");
    }

    public static void main(String[] args) throws InterruptedException {
        VolatileExample example = new VolatileExample();

        // Thread for running the loop
        Thread loopThread = new Thread(example::runLoop);

        // Thread for changing the flag
        Thread changeFlagThread = new Thread(example::changeFlag);

        loopThread.start();
        Thread.sleep(1000); // Wait for 1 second before changing the flag
        changeFlagThread.start();
    }
}