public class InputFile extends File {    static {        try {            System.loadLibrary("file");        } catch (UnsatisfiedLinkError e) {            System.err.println("can't find your library");            System.exit(-1);        }    }    protected int fd;    public InputFile(String path) {        super(path);    }    public native boolean open();    public native void close();    public native int read(byte[] b, int len);}