Void value as return parameter

Question

I have this interface:

public interface Command {
    T execute(String... args);
}

it works fine for most uses. But when I try to mode

Answer 1

I would stick to using Void explicitly. It's easy to see what is going on without another class involved. It'd be nice if you could override a Void return with void (and Integer with int, etc), but that is not a priority.

Answer 2

That problem is not that common, but neither that rare... I think I've seen a discussion about that some time ago, about Callables that return nothing.

I agree with the other posters that this is a good solution, much better than using Object or some other dummy placeholder.