some fun with functions

Mqtt.java

import java.util.function.BiFunction;

public class Mqtt
{


    public double calculate(BiFunction<Double, Double, Double> calc, double a, double b)
    {
        return calc.apply(a, b);
    }


    public static double sum(double a, double b)
    {
        return a + b;
    }


    public static double divider(double a, double b)
    {
        return a / b;
    }


    public static void main(String[] args)
    {
        var m = new Mqtt();
        System.out.println("Som: " + m.calculate(Mqtt::sum, 2,3));
        System.out.println("Divide: " + m.calculate(Mqtt::divider, 2,3));
    }


}