import java.util.concurrent.*;

public class Task280725 {
    public static void main(String[] args) throws Exception {
        ExecutorService executor = Executors.newSingleThreadExecutor();
        Future<String> future = executor.submit(() -> {
            Thread.sleep(1000);
            return "Done";
        });
        
        System.out.println(future.get(500, TimeUnit.MILLISECONDS));
        executor.shutdown();
    }
}