what is the advantage of using FutureTask over Callable?

Question

There are two approaches to submitting and polling task for result

FutureTask futureTask = new FutureTask(callable);

Answer 1

FutureTask class contains an additional " done()" method so we can override the done() method, then add the FutureTask object to the ExecutorService, so the done() method will invoke when the FutureTask completed immediately.