Convert Java into a dll file

is it possible to make portions of java program into a dll file so that other program can consume it?

dll which stands for Dynamic Link Library, is specific to windows and dos I believe, and so attempting to make a change like the one you request will break the ability of a program to work on mult OSs. There are several exe conversion utilities out there, but I haven't seen a dll conversion one, but then again, I haven't been looking.
Perhaps the best answer is not to directly answer your specific question, but try to answer your problem. I assume that you want Java talking to a C or C++ program or other similar program that can compile to dll form. If so, have you considered looking into using the JNI library? This is one of several solutions that will allow you to do just this. Again, using it usually breaks your program's ability to be interoperable on multiple OSs.
Good luck.

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    hey hemmj !!!!!!
    nice replying , first of all i d like to say thanks for response me so frequently..... i like such type of guy... i d never forget ur online support.
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    Copyright (C) Microsoft Corp 2000-2002. All rights reserved.
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    I cant get the problem origin from where it is comming, when i tried to convert it into .dll file it shown an error that, it did not recongnized the method in first class
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    is not recognized by .net dos prompt commnad. But when i omit this method it gets created the .dll file. This start method is basically the default method of thread class that run the thread from the same class..
    By vewing the code u can visulize the thing,, i ve marked the code from where the error is comming.
    Plz do it as soon as possible, i ll waiting for ur reply......
    I ll be really thanking u for that....
    Thanx and regards
    Niraj Kumar Singh

    I wonder if this will work:
    jbimp /t:exe chatServer.jar
    Your chatServer is an application that can be started from the commandline.
    A dll is a library to be used in com, com+, other executables or ....

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