import java.lang.reflect.InvocationTargetException;

import java.lang.reflect.Method;

import java.util.Scanner;

public class DynamicWay {

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

int a = 100;

int b = 200;

Scanner scanner = new Scanner(System.in);

System.out.println("Enter the ClassName");

String className = scanner.next();

Object obj =Class.forName(className).newInstance(); // It load the Class

//Calculator calc = new Calculator();

System.out.println("add");

System.out.println("subtract");

System.out.println("multiply");

System.out.println("divide");

System.out.println("Type Operation Name");

String methodName = scanner.next();

Class cls = obj.getClass();

Method method = cls.

getDeclaredMethod(methodName, int.class,int.class);

/*Method method = obj.getClass()

.getDeclaredMethod

(methodName, int.class,int.class) ;*/

Integer result =(Integer)method.invoke(obj, a,b);

System.out.println("Result is "+result);

/*switch(operation){

case "add":

result= calc.add(a, b);

break;

case "subtract":

result=calc.subtract(a, b);

break;

case "multiply":

result=calc.multiply(a, b);

break;

case "divide":

result=calc.divide(a, b);

break;

}

System.out.println("Result is "+result);

*/

}

}