functional programming in Java -

how can emulate functional programming in java, specifically, doing things map function collection of items?

 map(func, new string[]{"a","b","c"}); 

what's least verbose & awkward way it?

unfortunately attempts of functional programming have part of verbose and/or awkward in java.

the direct way provide function interface (such this 1 form guava) , provide kinds of methods take , call (such collections#transfrom() think map() method should do).

the bad thing need implement function , anonymous inner class, has terribly verbose syntax:

collection<outputtype> result = collections.transform(input, new function<inputtype,outputtype>() {     public outputtype apply(inputtype input) {       return frobnicate(input);     } }); 

it should noted planned lambda feature of java 8 make considerably easier (and possibly faster!). equivalent code in (the current form of) lambdas this:

collection<outputtype> result = collections.transform(input, someclass::frobnicate); 

or more verbose, more flexible:

collection<outputtype> result = collections.transform(input, in -> frobnicate(in));