Day-to-day Programming 2: Rename Files with numbers

How to rename a bunch of files with numbers?

From my earlier post-Day-today Programming 1 I told you how my mom asked me to write her a DVD.
Then as I mentioned earlier, I managed to take a printout of the filenames. Now I have to write them into a DVD. But mom asked me to rename the MP3s with numbers. so that she can find the number of the MP3 printed-out document. So I again wrote a simple java program to rename the files with numbers starting from 1.
Here is the small program I wrote.

//simple java program to rename files with numbers. 

import java.io.File;  
 import java.io.IOException;  
   
 public class Rename2Numbers {  
      public static void main(String[] args) throws IOException {  
           File folder = new File("C:/My Folder");  
             
           int i = 1;  
             
           for(File f : folder.listFiles()){  
                f.renameTo(new File("C:/My Folder/"+i+".mp3"));  
             i++;  
           }  
      }  
 }  

See, how small and how easy :)