RFR 8071670: java.util.Optional: please add a way to specify if-else behavior

[Paul Sandoz]

On Feb 12, 2015, at 8:29 PM, Louis Wasserman <lowasser at google.com> wrote:

> I'm not sure I can share hard numbers, but the ratio of 
> 
> if (optional.isPresent()) {
>   // non-returning statements here
> }
> 
> to 
> 
> if (optional.isPresent()) { // or negated
>   // non-returning statements here
> } else {
>   // non-returning statements here
> }
> 
> is ~5.5x in favor of the no-else case.  Both patterns have large numbers of hits, though, so I'm satisfied that this is not an unreasonable thing to do.

Many thanks, that's good to know.


> 
> I can possibly try to extract statistics on how many of these cases would be easily converted to method references and other things that might be easier to express with functional interfaces, but I'm not sure how necessary that actually is.
> 

It might be interesting, but i would be more curious about the following case:

if (!optional.isPresent()) {
...
}
// no else

would it be possible to get some numbers on that?

Thanks,
Paul.