Default methods

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-	An ability to add ('''default''') implementation for [[Java]] '''interface''' methods available since [[JDK8]] is called [[default methods]]. From one point of view, it is a useful concept (in case one paints himself into a corner by not following advices of [[TheAPIBook]] when designing the first version of the [[API]]). However the concept of [[default methods]] also comes with drawbacks. In case you have published an [[API]] full of interfaces (like {{JDK|java/util|List}} that people use as [[ClientAPI]], you are going to welcome the ability to add few [[default methods]] to such interface (just like the [[JDK]] team did).	+	#REDIRECT [[DefaultMethods]]
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-	== Increasing Fuzziness ==	+
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-	However '''interface''' with [[default methods]] is [[clarity|fuzzier]] than pure '''interface''' (without any implementation). '''interface''' with some (default) implementation no longer clearly defines a contract - e.g. its use for [[ProviderAPI]] is no longer as sharp as it could be.	+
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-	When somebody implements such '''interface''', one can choose to implement the '''default''' methods or ignore them. That increases [[fuzziness]]. Moreover when we look at the concept from the [[evolution]] point of view, it may get even fuzzier.	+
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-	Envision a pure '''interface''' defined in an initial version. Imagine the interface being implemented by various parties [[API]] users. Later the '''interface''' gets enriched with few [[default methods]]. When you look at an implementation of the interface which doesn't override the default methods: What can you conclude?	+
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-	Either they don't implement the [[default methods]] as they weren't existing when the implementations were written - e.g. they compiled against original version of the [[API]]. Or they don't implement the [[default methods]] because they are happy with their default implementation. That may make (and does make) a difference! But it is impossible to separate these two cases apart!	+
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-	[[TBD]]	+

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Current revision

1. REDIRECT DefaultMethods