StringBuilder to String.

Question

Hi im doing a Open uni course and am getting read to sit my exam so i have downloaded some old test papers and have been going throught them and am stuck on one question that takes a file and the reads from said file one line at a time and changes each char into another char so if i had an A it would change it to an int then add - 3 to it and then take the new string and write it to a new file i have coded.
import ou.*;
import java.io.*;
import java.util.*;
public class cipher
public static void encryptFile()
String pathwayRead = OUFileChooser.getFilename();
String pathwayWrite = OUFileChooser.getFilename();
File readFile = new File(pathwayRead);
File writeFile = new File(pathwayWrite);
BufferedReader bufferedFileReader = null;
BufferedWriter bufferedFileWriter = null;
StringBuilder temp = null;
String currentLine;
int counter = 1;
int letter;
try
   bufferedFileReader = new BufferedReader(new FileReader(readFile));
   bufferedFileWriter = new BufferedWriter(new FileWriter(writeFile));
   currentLine = bufferedFileReader.readLine();
   while (currentLine != null)
         if (counter == 5)
            counter = 1;
          for (int i = 0; i < currentLine.length(); i++)
            temp = new StringBuilder(currentLine);
            letter = temp.charAt(i);
            System.out.println((char)letter);
            letter = letter - counter;
            System.out.println((char)letter);
            temp.deleteCharAt(i);
            temp.insert(i, (char)letter);
            System.out.println(temp.charAt(i));
         counter = counter + 1;
         bufferedFileWriter.write(temp.toString());
         bufferedFileWriter.newLine();
         currentLine = bufferedFileReader.readLine();
catch(Exception anException)
     System.out.println("Error: " + anException);
finally
   try
      bufferedFileWriter.close();
      bufferedFileReader.close();
   catch(Exception anException)
      System.out.println("Error: " + anException);
}the System.out.println show me that the char are being changed as i wish but they are not being written like this.
say in one file i have the work "luke" i read in this file and the output file would have "lukd".

Answer 1

i figured it out i put the temp = new StringBuilder(currentLine); in the for loop when i moved it to the while loop the program work got to love programmer error.
Edited by: LukeD on Jun 8, 2008 8:47 AM