AFAIK,
You can't do ClassName::instanceMethod()
You have to do classInstance::instanceMethod()
So, even if getAddressOption() was an instance method, you would have to do
onePersonInstance::getAddressOption, and the method reference is bound to
that one instance which wouldn't fit with the example.
On Friday, November 2, 2012 4:33:14 PM UTC-5, Ricky Clarkson wrote:
>
> It's rare that you actually expose public fields in Java, so let's
> assume addressOption and friends are methods, and then the method
> reference syntax works fine.
>
> Also, I said 'with proper support', regarding the returned collection
> type. :) But sure, adding a .into wouldn't be too bad.
>
> On Fri, Nov 2, 2012 at 6:09 PM, clay <clayt...@gmail.com <javascript:>>
> wrote:
> > First, you can't use the :: method reference syntax with a variable.
> >
> > Secondly, the map and flatMap functions currently exist on the Stream
> > interface and return a modified Stream. So you have to start with
> > people.stream() and end with either a Stream instance or call
> > .into(someCollection) to put them into a collection.
> >
> >
> > On Friday, November 2, 2012 3:29:25 PM UTC-5, Ricky Clarkson wrote:
> >>
> >> With proper support it would be:
> >>
> >> List<String> zips2 =
> >> people.flatMap(Person::addressOption).flatMap(Address:zipOption);
> >>
> >> That might take a stubborn person a couple of minutes to understand
> >> but after that even the most determined anti-flatmapper will be able
> >> to curse, rewrite, fire the writer of but ultimately understand code
> >> like this without any real trouble.
> >>
> >> On Fri, Nov 2, 2012 at 5:22 PM, Fabrizio Giudici
> >> <fabrizio...@tidalwave.it> wrote:
> >> > On Fri, 02 Nov 2012 21:12:07 +0100, clay <clayt...@gmail.com> wrote:
> >> >
> >> >> In hindsight, a simpler solution (with static import of custom
> >> >> toIterable
> >> >> method) would be:
> >> >>
> >> >> final List<String> zips2 = new ArrayList<String>();
> >> >> for (Person p : people) { for (Address a :
> toIterable(p.addressOption))
> >> >> {
> >> >> for (String z : toIterable(a.zipOption)) { zips2.add(z); } } }
> >> >
> >> >
> >> > Honestly, I don't find it particularly readable.
> >> >
> >> >
> >> >
> >> > --
> >> > Fabrizio Giudici - Java Architect @ Tidalwave s.a.s.
> >> > "We make Java work. Everywhere."
> >> > http://tidalwave.it/fabrizio/blog - fabrizio...@tidalwave.it
> >> >
> >> > --
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