ayago

import java.util.function.Function;

import static java.lang.String.format;

class SamplePartialApplication {

    public static void main(String[] args) {

        Fx2<Integer, Integer, Integer> add = (x, y) -> x + y;
        System.out.println(format("Fully applied function of 2 arity result: %s", add.apply(2, 3)));

ayago

import java.math.BigDecimal;
import java.util.function.Function;

import static java.lang.String.format;

class ComposingFunctions {

    public static void main(String[] args) {
        
        Function<BigDecimal, Integer> asInteger = a -> a.intValue();

ayago

import java.util.function.Function;

import static java.lang.String.format;

class Scratch {
    public static void main(String[] args) {
        //instantiate as an object
        Function<Integer, String> stringifyInteger = stringifyInteger();
        System.out.println(format("Output is %s", stringifyInteger.apply(3)));