Converting a Text Document to ASCII

Question

| Test Application
| Created by Aaron
| Last Updated 7th March 2008
import java.io.*;
import javax.swing.*;
class Test {
public static void main(String[] args) throws IOException {
     BufferedReader readSecretMessage = new BufferedReader(new FileReader("SecretMessage.txt"));
     JOptionPane.showMessageDialog(null, readSecretMessage.readLine());
     do {
     int ASCII= 98; // Example
     String yourString= ""+((char)ASCII);
     JOptionPane.showMessageDialog(null, yourString);
     while(readSecretMessage.read() != -1);
}     Heres my testing code so far... It's wrong i know! But i'm really stuck... I want to convert the txt document "SecretMessage.txt" to ASCII characters and shift the characters 13 places (so for example B will become O, etc)... Any tips and pointers? I know i'm essentially there...Any help appreciated.

Answer 1

TheMungo wrote:
Ok... No I don't.
          String foo = "abcde";
          for (int i = 0; i < foo.length(); i++)
          System.out.print((int) foo.charAt(i)+13);
          }How do I get back to characters after?As posted above:
Than you cast back with (char).But I don't think that will mean anything to you.
Lets break this down into smaller tasks. The first is to turn a char into a number. We can do this by something called a "cast". so:
char myChar = 'a';
int myCharAsAnInteger = (int)myChar;See the () bit, that "casts" the char into an integer.
The next task is to add an amount to the integer (and handle overflows and stuff, but we shall deal with that later). I'll let you do this part.
Finally we have to take a integer and make it a char again. Using what is shown above have a go at this.