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

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.