Java tutorial
import java.util.function.Function; public class Main { public static void main(String[] args) { Function<Integer, String> converter = (i) -> Integer.toString(i); Function<String, Integer> reverse = (s) -> Integer.parseInt(s); System.out.println(converter.apply(3).length()); System.out.println(converter.andThen(reverse).apply(30).byteValue()); } }