import java.io.*;

public class DirectoryRename {

   private File directory;
   private File[] files;

   public DirectoryRename(File dir, String prefix, String postfix) {   
      
      this.directory = dir;
      
      if (dir.isDirectory()) 
         files = directory.listFiles();
         
      for (int i=0; i < files.length; i++) {
      
         if (files[i].renameTo(new File(dir, prefix + i + postfix)))
            System.out.println("Renaming: " + files[i] + "\t To: " + prefix + i + postfix);
      }   
      
   }
   
   public static void main(String args[]) {
   
      char singleBSlash = '\\';
   
      args[0].replace(singleBSlash, File.separatorChar);
   
      DirectoryRename dr = new DirectoryRename(new File(args[0]), args[1], args[2]);
         
   }
}