Hello!

I'm using a PrintWriter to write a String into a file. So far so good. However, now I'm trying to make an encryption program and I noticed that some numbers just don't go well.
For example: if a char after encryption has the integer value of 157 then if I write a String containing that char to a .txt file and then read it in again then it will have changed to 63...
Same things happen for several values such as 137 for example (which also becomes 63). Why is this happening and how can I avoid it?
It's making my decryption give me faulty results in the case of those characters however the problem only appears when I save to a file and load it again before decrypting it. The decryption works perfectly if I use it on the String without first writing it to a file.

Hello!

I'm trying to make a program that generates a random labyrinth, I do this by using a Randomized Depth-First (se wikipedia, http://en.wikipedia.org/wiki/Maze_generation_algorithm , for the basic idea). I have just one problem, I want to be going in randomized directions but I don't want the program to check the same direction twice. So I want it to pick a random direction and if that "cell" has already been visited (meaning there can't be a path going from the current cell to that cell) then I want the program to check another direction from the current cell without ever checking the same direction again (since we know it's unavailable).
One suggestion I was considering is to create a collection and mixing it with Collection.shuffle but I've never used collections before and I don't know how to use that to make the program call 4 methods in a random order that way.
Anyone have a recommendation or a good trick I can use?

Thank you!

Hello!

I'm trying to make a program that generates a random labyrinth, I do this by using a Randomized Depth-First (se wikipedia, http://en.wikipedia.org/wiki/Maze_generation_algorithm , for the basic idea). I have just one problem, I want to be going in randomized directions but I don't want the program to check the same direction twice. So I want it to pick a random direction and if that "cell" has already been visited (meaning there can't be a path going from the current cell to that cell) then I want the program to check another direction from the current cell without ever checking the same direction again (since we know it's unavailable).
One suggestion I was considering is to create a collection and mixing it with Collection.shuffle but I've never used collections before and I don't know how to use that to make the program call 4 methods in a random order that way.
Anyone have a recommendation or a good trick I can use?

Thank you!

Hello, I'm quite new to programming and I want to be able to get a little better at it.
I don't have too much trouble making the code for what happens but I'm really bad
at making a window that shows everything.
I once got the graphics for a Slot Machine and managed to make it work quite well
but I can hardly make something more interresting than a textfielf and textarea if
I have to do it myself so I was just wondering if someone knows a tutorial that helps
me get started with this.