create a dll for external call

[Kouts]

Hello all!
I would like to ask something regarding dlls and Java: I would like to
transform my Java code to a dll, in order to allow to third party
applications (e.g. VB or Power Builder applications ) to call specific
functions (previously exposed by me) from this dll. Is this possible
in Java? (I have made the same from PowerBuilder and MDev Studio-C++).
Generally, is any other way to do it (to expose Java code-functions to
third party developed applications)?
I think to create an exe,executable jar file is another solution.
Note: Installation PC will not have an AS, just JDK installation.

Thanks in advance,
Kouts