public class TestTask {
    public static void main(String[] args) throws ExecutionException, InterruptedException {
        ExecutorService executor = Executors.newSingleThreadExecutor();
        executor.execute(() -> System.out.println("execute"));
        executor.shutdown();
    }
}

public class MyFuture implements Runnable {
    @Override
    public void run() {
        System.out.println("EXECUTE");
    }
}

public class TestTask {
    public static void main(String[] args) throws ExecutionException, InterruptedException {
        ExecutorService executor = Executors.newSingleThreadExecutor();
        executor.execute(MyFuture::new);
        executor.shutdown();
    }
}

        executor.execute(MyFuture::new);

executor.execute(new MyFuture());