import java.lang.reflect.InvocationTargetException;

import java.lang.reflect.Method;

import java.util.Scanner;

public class WithReflection {

public static void main(String[] args) throws InstantiationException, IllegalAccessException, ClassNotFoundException, NoSuchMethodException, SecurityException, IllegalArgumentException, InvocationTargetException {

// TODO Auto-generated method stub

Scanner scanner = new Scanner(System.in);

System.out.println("Type Calculator for int Calc");

System.out.println("Type BigValueCalculator for long Calc");

String calcChoice = scanner.next();

Object object = Class.forName(calcChoice).newInstance();

System.out.println("Type Add for Addition");

System.out.println("Type Subtract for Subtraction");

System.out.println("Type Multiply for Multiplication");

System.out.println("Type Divide for Division");

String operationName = scanner.next().toLowerCase();

Method method = object.getClass()

.getDeclaredMethod(operationName,

int.class, int.class);

method.setAccessible(true);

Object result = method.invoke(object, 100,200);

int expectedResult = 300;

System.out.println(result);

if(operationName.equals("add")){

if(((Integer)result).intValue() == expectedResult){

System.out.println("Test Pass");

}

else

{

System.out.println("Test Fail");

}

}

}

}