Function as Argument in Lambda

package com;

The following is an example of how method is implemented by passing the functionitself as an argument.

We have got couple of implementations for the circle interface and they two different operations with respect to context. Those anonymous class implementations itself are passed as argument to another generic method, thus achieving a level of generic function.

public class LambdaFunctionArgument {

  interface Circle {

    double get(double radius);

  }

  public double circleOperation(double radius, Circle c) {

    return c.get(radius);

  }

  public static void main(String args[]){

    LambdaFunctionArgument reference = new LambdaFunctionArgument();

    Circle circleArea = (r) -> Math.PI * r * r;

    Circle circleCircumference = (r) -> 2 * Math.PI * r;

    

    double area = reference.circleOperation(10, circleArea);

    double circumference = reference.circleOperation(10, circleCircumference);

  

    System.out.println("Area: "+area+" . Circumference: "+circumference);

  }

}