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// Program to demonstrate how to use the Function and BiFunction functional interfaces

import java.util.function.Function;

import java.util.function.BiFunction;

public class FunctionalInterfaces {

/**

* A functional interface such as Function class takes two generic types, the

* type of the input and the type of the output. They can be written as

* anonymous classes that implement the Function interface, but they are more

* commonly written as lambda functions.

static Function<String, String> sayHello = name -> "Hello, " + name;

/**

* A BiFunction works the same way as a Function,except for taking two input

* types

static BiFunction<Integer, Integer, Integer> sumValues = (x, y) -> x + y;

public static void main(String[] args) {

// Function types are invoked using the .apply() method on the interface

System.out.println(sayHello.apply("Dan"));

System.out.println(sumValues.apply(3, 2));

}