JAVA EE: Non-Static Method reference - BiFunction | Method reference in Java 8

Click here to watch in Youtube :
https://www.youtube.com/watch?v=zqTh-I6HZ4A&list=UUhwKlOVR041tngjerWxVccw

MethodReferenceDemo.java

import java.util.function.BiFunction;

/**
 *
 * We are using predefined functional interface BiFunction and
 * referring a non-static method add(int a, int b) to it's functional
 * method apply(Integer t,Integer u).
 *
 */

class Arithmetic
{
    public int add(int a, int b)
    {
        return a + b;
    }
}

public class MethodReferenceDemo
{
    public static void main(String[] args)
    {
        BiFunction<Integer, Integer, Integer> adder = new Arithmetic()::add;
        int result = adder.apply(200, 200);
        System.out.println(result);
    }
}