GeezerVison

// 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 sayHello = name -> "Hello, " + name; /** * A BiFunction works the same way as a Function,except for taking two input * types */ static BiFunction 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)); } }