JDK 8 code review request for 8005298 Add FunctionalInterface type to the core libraries
peter.levart at gmail.com
Wed Jan 16 22:25:32 UTC 2013
On 01/16/2013 05:58 PM, Joe Darcy wrote:
> On 1/16/2013 8:32 AM, Florian Weimer wrote:
>> On 01/16/2013 05:27 PM, Brian Goetz wrote:
>>> The primary purpose of this annotation is to *capture design
>>> intent*. It is not required. The compiler will help you enforce
>>> the design intent if you provide it. The compiler will not
>>> synthesize this annotation, since that would be guessing at the
>>> design intent. It is possible to create classfiles that subvert the
>>> design intent.
>>> The point about other languages was simply to point out that the
>>> universe of tools that might usefully use this design intent is
>>> bigger than sometimes assumed.
>> I don't think run-time behavior should depend on optional annotations
>> documenting design intent (like @Override).
>> Supporting the discovery of functional interfaces is a good idea. But
>> a method like Class#isFunctionalInterface() would sever this purpose
>> better than an entirely optional annotation.
> A method like Class#isFunctionalInterface is planned too for later in
> JDK 8.
I can imagine that a method like that would be useful if also
accompanied with a method like:
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