I download coddec.patch
Tutorials to get this working :
Download coddec.rar from wherever
Extract into some directory and cd into the directory
patch -p1 < coddec.patch
find . -name “*.java” > FILES.TXT
for/f %x in (FILES.TXT) do javac %x (or some equivalent sh)
java -classpath . net.rim.tools.compiler.Compiler FOO.COD

but idk what they write
Can anyone help me ?

You didn't write if you are aware that this patch is supposed to be executed under Linux.
At least from within an environment that has a Unix shell(bash, sh, csh, ksh, whatever).
I don't know if the Blackberry has one (it seems to be a patch for Blackberry).
If the Blackberry itself has no shell, my proposal is get yourself a copy of a live-distro out there. Put your files that you want to patch on an USB-stick and patch it by following the instructions. They are simple shell commands. Note that your live-system needs to have a Javacompiler installed (the "javac" part of the instructions).
By the way, I have no idea how this is advanced programming related - not to mention reversing.

greetings
darkelf