Rot13 encryption problem

[Fifa4ever]

MY problem is that I can not seem to be getting any information from "test.txt"
the other thing i need is i need to then encrypt "test.txt" and save it in a file specified by the user.
im pretty stuck, because my teacher is not much help at all.

menu class

// import and package//
package rot;
import java.io.*;
public class Menu {


public static void main ( String[] args ) throws Exception{

// Accessing other classes
//Ciper r = new Ciper();
Writetofile g = new Writetofile ();
Dtos e = new Dtos();
// user input variables
String input;
int select1;
BufferedReader stdin = new BufferedReader (
new InputStreamReader (System.in));


//main menu
System.out.println("Hello and welcome to my ROT13 cipher java program" );
System.out.println("1. Encrypt");
System.out.println("2. Decrypt");
System.out.println("3. Exit");
System.out.println("Please input the corresponding number" );
input = stdin.readLine ();
select1 = (int) Integer.parseInt (input);

if (select1 == 1) {
System.out.println("Accessing File ");





//g.openFile();
//g.readFile();
//r.encrypt();
//g.closeFile();


System.out.println("Loading Please wait !");
System.out.println("");
System.out.println("File Message.txt is now Encrypted.!!");


}
else if (select1 == 2) {

System.out.println("Decrypting Message.txt! ");




} else if (select1 == 3) {
System.out.println("Thank you for using my program!!");
}






}
}

class with all my methods in it

package rot;

import java.util.Formatter;
import java.util.Scanner;
import java.io.*;
public class Writetofile {

//Ciper u = new Ciper ();
int y;
private Formatter k;
public Scanner x;
String plaintext;
String fileName = new String ();

String str;
FileWriter fw;
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));


public void openFile(String o){
try {
System.out.println("Messages.txt be encrypted or decrypted:");
x = new Scanner (new File (o));
}
catch (Exception e) {
System.out.println("Could not find file.Bye!");
}
}



public void closeFile () {
k.close();
}



public String readFile(String o){
while (x.hasNextLine()){
System.out.println(x.nextLine());

}
return o;

}



public void encrypt(){
y = plaintext.length();
char[] chars = new char[y];
for (int i = 0; i < y; i++)
{
chars[i] = plaintext.charAt(i);
}

for (int i = 0; i < chars.length; i++)
{
if ((chars[i] >= 'a' && chars[i] <= 'm'))
{
chars[i] += 13;
}
else if ((chars[i] >= 'n' && chars[i] <= 'z'))
{
chars[i] -= 13;
}
else if ((chars[i] >= 'A' && chars[i] <= 'M'))
{
chars[i] += 13;
}
else if ((chars[i] >= 'N' && chars[i] <= 'Z'))
{
chars[i] -= 13;
}
System.out.print(chars[i]);
}
return fileName;

}





}

[Zren]

Assuming you didn't forget to uncomment the function calls...

Java:

//g.openFile(); public void openFile(String o){

What's wrong with the first line after looking at the second?


As for writing to a file: http://lmgtfy.com/?q=bufferedwriter+example You can also use the PrintWriter class if you want similar methods to those found in System.out.*.

Actually, I'm amazed the teacher isn't helping you with a standard in/out task. Did you skimp reading course reading?

[Fifa4ever]

okay so i believe that i will now be able to write to a new file. I just need help in actually reading the file. maybe someone could check over my readtofile method . If anyone has the time to check it over, would be appreciated!

[Zren]

This reads a file fine:

Java:

public class Test {         public static void main(String[] args) {                 File inputFile = new File("in.txt");                 try {                         Scanner in = new Scanner(inputFile);                         while (in.hasNextLine()) {                                 System.out.println(in.nextLine());                         }                         in.close();                 } catch (IOException e) {                         e.printStackTrace();                 }         } }

I don't see why it wouldn't work unless it's the way you've structured your code. Does your menu work?

[Fifa4ever]

alright got some free time on my hands, ill get back if i need anymore help