code: public static boolean deleteFile(File file) throws IOException
    {
      if(!file.exists())
        return false;
  
      File[] files = file.listFiles();
  
      if(files != null)
      {
        for(int i = 0; i < files.length; i++)
        {
          File childFile = files[i];
          if(childFile.equals(file))
            continue;
  
          if(childFile.isDirectory())
            deleteFile(childFile);
          else
            childFile.delete();
        }
      }
  
      return file.delete();
    }
docs: Deletes the file provided. If it is a directory, recursively deletes a directory and its content.
  
  @param file
  @return <code>true</code> if the file was deleted, <code>false</code>
  if didn't exist
  @throws IOException