Major breakthrough in the language features of [[Java]] has been delivered as part of [[JDK]] 1.8 - e.g. [[JDK8]]. [[ExtendingInterfaces]] can be done with [[Default methods]] (as significant change from the [[API]] perspective) and one can, of course, code using [[lambdas]]. The short [[Blogs:JaroslavTulach:Theory:History of Programming Languages|history of programming languages]] said that [[Java]] makes [[closures]] popular by not having them. [[JDK8]] fixes that!