// 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));
}
}