File Encryption Assignment

Back when you were learning about the string class, you took a message that was inputted by the user and encrypted it by adding an integer to the Unicode value of each character.  This process can also be applied to file encryption.

Your task is to take a text file that you would like to protect, write a program that will protect it by encrypting it and then have the ability to de-crypt the file.  Your program should:

1. Have some kind of menu system that prompts the user to Encrypt, Decrypt or Exit.
2. Read a text file that isn't encrypted.  You can create your own file or use this one - SecretPasswords  Just remember to keep this file in the same folder as your java code or the program will raise a java.io exception.
3. Encrypt the secret file by adding some value to the Unicode value of each character in the file.  Use a method to do this (you have already developed one).
4. Decrypt a secret file, restoring it so that the user is able to read the text.  Create a method for this.
5. Submit text files (regular and encrypted) with assignment to dropbox.

Hints:

Some useful code for dealing with the end of a file:

FileReader myFile = new FileReader("abc.txt");
BufferedReader buff = new BufferedReader(myFile);

try {
  boolean eof = false;
  while (!eof) {
    String line = buff.readLine();
    if (line == null)
      eof = true;
    else
      System.out.println(line);
    }
}
*** Don't forget the catch statement ****
    .... YOU DON'T THINK I'M GOING TO GIVE YOU ALL OF THE CODE!!