import java.util.concurrent.atomic.AtomicInteger;

class Counter implements Runnable {
    private static AtomicInteger i = new AtomicInteger(3);

    public void run() {
        System.out.print(i.getAndDecrement());
    }
}

public class Test {
    public static void main(String[] args) {
        Thread t1 = new Thread(new Counter());
        Thread t2 = new Thread(new Counter());
        Thread t3 = new Thread(new Counter());
        Thread[] threads = {t1, t2, t3};
        for(Thread thread : threads) {
            thread.start();
        }
    }
}

I ran this code many times and I always get 321 as the answer but I am not sure this code can get any other output.