Rename Files in a list

Question

I need help.
The code below compiles, it runs but doesn't rename the files. Can someone test it and tell me where I went wrong!
The value of result is always false. The variable fileToRename returns me false i.e not a file and also not a directory????
Thanks in advanced
import java.io.*;
public class  TestFileReader
     public static void main(String[] args)
           File myDir = new File("C:\\Temp");
File [ ] files = getAllFiles(myDir,".java");
BufferedReader br = null;
String line;
File fileToRename = null;
try {
for (int i = 0; i < files.length ;i++ ) {
File f = files;
br = new BufferedReader(new FileReader(f));
while ((line = br.readLine()) != null) {
// System.out.println(line);
int dot = f.getName().lastIndexOf('.');
String newFileName = f.getName().substring(0, dot) + i + f.getName().substring(dot);
// Create a directory
File f1 = new File("C:\\Temp\\tmp") ;
//create a new File to this directory
fileToRename = new File(f1, newFileName);
boolean result = f.renameTo(new File ( f1, f.getName()));
if (result) {
System.out.println("File renamed : " + newFileName);
br.close();
catch (IOException e)
          e.printStackTrace();
public static File [ ] getAllFiles(File  filePath, final String filter)
  File  [ ] files = null;
  if (filter != null)
     if (filePath != null && filePath.isDirectory())
        files = filePath.listFiles(new FilenameFilter()
           public boolean accept(File dir, String name)
  File file = new File(dir.getPath()+ File.separator + name);
/**if (file.isDirectory())
return true;
return false; */
return name.toLowerCase().endsWith(filter);
       return files;
  else
       if (filePath != null && filePath.isDirectory())
        files = filePath.listFiles(new FileFilter()
           public boolean accept(File fileName)
      return fileName.isFile();
   return files;

Answer 1

first, you should make sure that the directory C:\\Temp\\tmp exists, so do this
File f1 = new File("C:\\Temp\\tmp") ;
f1.mkdirs();Second, you have some test code above that opens the file, for debugging purposes one would guess. But you don't close the file. Because of this, java is unable to move it.
If you comment out
//    br = new BufferedReader(new FileReader(f));
//    while ((line = br.readLine()) != null)  {
      // System.out.println(line);
//    }it should work