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If you use JNI to access native code you'll quickly find yourself writing some glue in c/c++ to access the native library. With JNA you can write nice clean code in Java without the need to glue your java code to the native library. This is all done by JNA.
All you need to do is define an interface that (extends the Library interface and) exposes the methods in the library that you want to access:Next you load the library using the following code:
Kernel32 kernel32Instance = (Kernel32)
Native.loadLibrary("kernel32", Kernel32.class);
That's all there is to it, you can now access all methods you defined in the interface.
Checkout the project page