java jna 调用windows动态链接库

import com.sun.jna.Library;
import com.sun.jna.Native;
import com.sun.jna.Platform;
import com.sun.jna.WString;

public class Program {

    public interface user32 extends Library
    {
        public int MessageBoxW(int something, WString text, WString caption, int flags);
    }

    public static void main(String[] args) {
        @SuppressWarnings("deprecation")
        user32 lib = (user32) Native.loadLibrary("user32", user32.class);
        lib.MessageBoxW(, new WString("MessageBox success!"), new WString("Attention"), );
        System.out.println("end");
    }
}

需引入:jna-5.4.0.jar和jna-platform-5.4.0.jar