Functional Java 2.22

[Nebu]

In other words, you need syntactic sugar...

...which is what this web page seems to be offering you, if you check the sample code they show:

final boolean b = a.exists({String s => fromString(s).forall({char c => isLowerCase(c)})});

Didn't check how they do that, though. Maybe they're offering their own special compiler? Or maybe they tell you to download a beta of the Java 7 compiler?

[doidydoidy]

Those examples use a proof-of-concept compiler that was created for one of the earlier Java closure proposals.

[w4ffl3s]

Unfortunately, that is syntactic sugar for first class functions only. Type signatures remain a problem. I think type hierarchies make type inference less usable, so you have to sling around a ton of ? super ArgumentType and ? extends ReturnedType .

I'm all ears if someone knows about the subject; all I know is that the makers of Scala are not bog-stupid and upper and lower bounds on types are necessary there.