State of the Lambda #4 (
http://cr.openjdk.java.net/~briangoetz/lambda/lambda-state-4.html) says you
can do:
ClassName::staticMethod
or
instanceName::instanceMethod
On Friday, November 2, 2012 5:50:37 PM UTC-5, Ricky Clarkson wrote:
>
> I can't confirm right now but I'm pretty sure I've done
> ClassName::methodName in my experiments with FunctionalJava and Java 8.
> Doesn't the State of the Lambda cover that too?
> On Nov 2, 2012 6:54 PM, "clay" <clayt...@gmail.com <javascript:>> wrote:
>
>> 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> 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<http://tidalwave.it/fabrizio/blog>-
>>> >> >
>>> fabrizio...@tidalwave.it
>>> >> >
>>> >> > --
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>>> >> >
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