volatile as a boolean flag.

public class VolatileAsFlag extends Thread {
volatile boolean keepRunning = true;

public void run() {
long count = 0;
while (keepRunning) {
count++;
}
System.out.println("Thread terminated." + count);
}

public static void main(String[] args) throws InterruptedException {
VolatileAsFlag t = new VolatileAsFlag();
t.start();
t.getState();
Thread.sleep(1000);
t.keepRunning = false;
System.out.println("keepRunning set to false.");
}
} 

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