What the heck is going on with my CODE?

Question

Ok.. so the program encrypts and decrypts text files.. you input the paths for which file to read and where to export it to..
the encrypt code and decrypt code is EXACTLY the same only like ONE line of code is different.. the difference was one had "encrypt()" the other had "decrypt()"
I changed it back to the original "encrypt()" and it worked fine.. which doesnt make any sense because the encrypt() and decrypt() methods are exactly the same only one encrypts the stuff while the other decrypts..
This is what the ActionListener looks like:
String command = group.getSelection().getActionCommand();
          String tempString = inputTimes.getText();
          File inputPath = new File(inputFile.getText());
          File outputPath = new File(outputFile.getText());
          if(inputPath.isAbsolute())
               if(inputPath.exists())
                    if(inputPath.isFile())
                         if(outputPath.isAbsolute())
                              if(!outputPath.exists())
                                   try{
                                        outputPath.createNewFile();
                                        FileWriter writeFile = new FileWriter(outputPath);
                                        if(tempString.length() == 0)
                                             String theText = readFile(inputPath);
                                             writeFile.write(dataTool.encrypt(theText, "1", command), 0, theText.length());
                                             outputFileStatis.setText("Success");
                                             writeFile.close();
                                        else
                                             String theText = readFile(inputPath);
                                             writeFile.write(dataTool.encrypt(theText, tempString.substring(0), command), 0, theText.length());
                                             outputFileStatis.setText("Success");
                                             writeFile.close();
                                   } catch(IOException e) {
                                        System.out.println(e);
                              else
                                   outputFileStatis.setText("Failed: Cannot overwrite files");
                         else
                              outputFileStatis.setText("Failed: Path's not absolute");
                    else
                         outputFileStatis.setText("Failed: Cannot encrypt directories");
               else
                    outputFileStatis.setText("Failed: File does not exist");
          else
               outputFileStatis.setText("Failed: Path's not absolute");
And then the method readFile() which is used in the above code:
public static String readFile(File f) throws IOException
          StringBuffer sb = new StringBuffer();
          BufferedReader in = new BufferedReader(new FileReader(f));
          String line = "";
          while((line = in.readLine()) != null) {
          sb.append(line).append(' ');
          in.close();
          return sb.toString();
So why does it not work when I change the encrypt() part to decrypt() ???

Answer 1

ok.. so..
when the Encrypt File button is pressed it runs this part if it passes the IF statements:
try{
                                        outputPath.createNewFile();
                                        FileWriter writeFile = new FileWriter(outputPath);
                                        if(tempString.length() == 0)
                                             String theText = readFile(inputPath);
                                             writeFile.write(dataTool.encrypt(theText, "1", command), 0, theText.length());
                                             outputFileStatis.setText("Success");
                                             writeFile.close();
                                        else
                                             String theText = readFile(inputPath);
                                             writeFile.write(dataTool.encrypt(theText, tempString.substring(0), command), 0, theText.length());
                                             outputFileStatis.setText("Success");
                                             writeFile.close();
                                   } catch(IOException e) {
                                        System.out.println(e);
which encrypts the text in the file specified to look something like:
tittemfek2ueehseo2yt2sistdi2s2i2ww2sta2satsfsaoo22r0222e2orrrjr
then when the decrypt file button is pressed it is supposed to run the same thing only
encrypt is changed to decrypt
and it runs the readFile(File) method listed in the first post to read the files.
it runs the encryption perfectly, but when it decrypts it the command prompt fills with errors and scrolls several times..
there is no problem with the decrypt method, it has to be the readFile(File) method but I dont know how to fix it..