Java8 method reference used as Function object to combine functions

Question

Is there a way in Java8 to use a method reference as a Function object to use its methods, something like:

Stream.of(\"ciao\", \"hola\", \"hello         


        

Answer 1

You can just save it into a variable:

Function toLength = String::length;
Stream.of("ciao", "hola", "hello")
      .map(toLength.andThen(n -> n * 2));

Or you can use a cast, but it's less readable, IMO:

Stream.of("ciao", "hola", "hello")
      .map(((Function) String::length).andThen(n -> n * 2));