Refection using Java

This short article shows how Reflection works using Java.

I am extract the source from

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;


                        .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 The sample file name is My MSN ID is


About chanmingman

Since March 2011 Microsoft Live Spaces migrated to Wordpress ( till now, I have is over 1 million viewers. This blog is about more than 50% telling you how to resolve error messages, especial for Microsoft products. The blog also has a lot of guidance teaching you how to get stated certain Microsoft technologies. The blog also uses as a help to keep my memory. The blog is never meant to give people consulting services or silver bullet solutions. It is a contribution to the community. Thanks for your support over the years. Ming Man is Microsoft MVP since year 2006. He is a software development manager for a multinational company. With 25 years of experience in the IT field, he has developed system using Clipper, COBOL, VB5, VB6, VB.NET, Java and C #. He has been using Visual Studio (.NET) since the Beta back in year 2000. He and the team have developed many projects using .NET platform such as SCM, and HR based applications. He is familiar with the N-Tier design of business application and is also an expert with database experience in MS SQL, Oracle and AS 400.
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