How to get J2EE installation directory?

when we install J2EE, we install it in a directory, i.e.
c: \ j2sdkee1.4
but how to get the directory programmatically on Windows OS using Java or C++ launguage?
thx

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sorry i made a little mistake (didn't poste the updated version of my code)
here is the right code:
[Code]
var
maxnb8bf : Integer;
maxDirectory:        String;
nb8bf : Integer;
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