How can I encode using ASCII Values???

Question

Hello Folks!
Would be nice if you could help me with this:
I have some password and want to Caesar-Encode it (means f.example: if you have a letter, then you'd "increment" it by f.e. three letters in alphabet... means 'a' would become 'd', 'b' -> 'e', etc.).
I would like to do this by getting the ASCII-Code of the char and then add a specified value to it to get another char out of it. But it has to be reversible!! That means if the pass is like 'ghK3m.L4@o' and I encode it now, I should have a method that can decode it back to ghK3m.L4@o
again. That means Case-sensitiveness and that stuff needs not to get lost!
Is that passible in this way, Dou you have some Code for me??
Thanks for answers!!

Answer 1

public static String upShift(String string, int toShift)
    String toReturn = "";
    for(int i=0;i<string.length();i++)
        toReturn += (char)(string.charAt(i) + toShift);
    return toReturn;
}And I was going to make another one, downShift() and then realised that would be pointless, just pass a negative number to upShift(), like so:
public static String downShift(String string, in toShift)
    return upString(string, -toShift);
}This is untested, but I think it'll do what you want.
Good luck,
Radish21