Chapter 26 - Answers page

[mabiosb]

I believe that the alternative of the letter 'A' is also correct.

1. Given:

ExecutorService service = Executors.newFixedThreadPool(2);
Future result = service.submit(() -> 1);

Assuming it compiles correctly, what is the type of the lambda expression?
A. Runnable
B. Callable
C. Supplier
D. Function

[eh3rrera]

Well, while submit also takes a Runnable, the lambda expression in the question returns a value (1), so it has to be a Callable, which can return a value.

However, this question may be unnecessarily confusing, so I changed Runnable to Predicate.

Thanks!

[mabiosb]

Got it! Thanks for the explanation.