import java.io.*;
import java.lang.reflect.*;
import java.math.BigInteger;

class Serializer {
    static void serialize(Object o, OutputStream out) throws Exception {
				if (o.getClass().equals(BigInteger.class)) {
						BigInteger b = (BigInteger) o;
						byte[] bytes = b.toByteArray();
						out.write(bytes.length);
						out.write(bytes);
				} else {
						ObjectOutputStream oOut = new ObjectOutputStream(out);
						Class<?> cls = o.getClass();
						for (Field f : cls.getDeclaredFields()) {
								boolean wasAccessible = f.isAccessible();
								f.setAccessible(true);
								oOut.writeObject(f.get(o));
								f.setAccessible(wasAccessible);
						}
				}
				out.flush();
    }

    public static void main(String[] args) throws Exception {
				serialize(new Point(2, 4), new FileOutputStream("point.data"));
    }
}