String and arraylist

Question

i have this code that retrieves files from a folder and displays them as an array. what i want to do is drop the .xxx extension from the files.
i use this code and it works fine
               String junk = "1220145678999345.abc";
               System.out.println(junk);
               junk = junk.substring(0,junk.length()-4);
               System.out.println(junk);but when i try to set the String junk = files; its cant convert???
here is my code, can anyone make a suggestion on how
     public static void main(String args[])
          String folderName = "\\C:\\unload";
          String processedFolderName = "\\C:\\unload_processed";
          File f = new File(folderName);
          File files[] = f.listFiles();
          try
               for(int i = 0; i < files.length; i++)
                    if(files.isFile())
                         System.out.println(files[i]);
                         BufferedReader inStream = new BufferedReader(new FileReader(files[i]));
                         String line = inStream.readLine();
                         File list = files[i];//list of files in array
                         for(int c = 0; c < list.length(); c ++)
                              while(line != null)
                                   //System.out.print(line + "\n");
                                   line = inStream.readLine();
                              }//while     
                         }//for     
                         inStream.close();                     
                    }//if
               }//for
               String junk = "1220145678999345.abc"; //would like to set this to files[i] but it wont let me - how do i resolve this???
               System.out.println(junk);
               junk = junk.substring(0,junk.length()-4);
               System.out.println(junk);
          }//try
          catch(FileNotFoundException e)
               System.out.println("FileNotFoundException: " + e.getMessage());
               e.printStackTrace();
          }//catch
          catch(IOException e)
               System.out.println("IOException: " + e.getMessage());
               e.printStackTrace();
          }//catch          
     }//main

Answer 1

File list = files;//list of files in array
for(int c = 0; c < list.length(); c ++) {
This doesn't make sense.
"list" is actually the file that's stored at position i of the list of files. Length returns the file size.
For every byte c in the file, you read the entire file and... do nothing with the data.