using API functions in DLL files in windows

hi, everyone. I need help please in solving this problem. I need to use API functions in DLL files to complete a class test. I heard
JNI can help but as I'm a beginner I have not used JNI yet. So in two parts I need your help please, first using API functions, second using JNI.

thanks,
ali.

You can start learning about JNI at http://java.sun.com/developer/onlineTraining/Programming/JDCBook/jni.html and http://www-stat.stanford.edu/~naras/java/course/lec5/lec5.html

It's not one or the other. You cannot call (native) API functions from a DLL without JNI*. You may want to check out this.

* Technically you can with JNA, but that uses JNI itself under the covers.