Reflection using Java

This short article shows how Reflection works using Java.

I am extract the source from http://examples.javacodegeeks.com/core-java/reflection/java-reflection-example/.

First you need to import the following namespace.

import java.lang.reflect.*;

You have a class with a method in RentCar

public class RentCar {

private int rate;

 

public void computeRentalCost(int numDays) {

            price = numDays * rate;

            System.out

                        .println(“The cost of your rental car is “ + price + ” euros”);

      }

}

To do Reflection (code fragment below).

Class rental = RentCar.class;

// get method with specific name and parameters

Method oneMethod = rental.getMethod(“computeRentalCost”,

    new Class[] { Integer.TYPE });

System.out.println(“Method is: “ + oneMethod);

 

// call computeRentalCost method with parameter int

oneMethod.invoke(rent, 4);

 

// get all the parameters of computeRentalCost

Class[] parameterTypes = oneMethod.getParameterTypes();

System.out.println(“Parameter types of computeRentalCost() are: “

                              + Arrays.toString(parameterTypes));

The re-upload the project to http://skydrive.live.com. The sample file name is JavaReflectionExample2.zip My MSN ID is chanmmn@hotmail.com.