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If I add the line "System.out.println(decrypt);" right after the line "decrypt = decrypt + d" it actually prints out the right thing, but it does it over and over again in sort of an endless loop....

I assume you mean by defining a new string as Character.toString(d). That doesn't work either though. If you mean something different, then please elaborate. I have roughly one week of programming...

Nevermind. It turns out it worked. The only thing wrong with it is my lack of patience.