import java.io.FileOutputStream;
import java.io.ObjectOutputStream;
import java.security.MessageDigest;
public class MainClass {
public static void main(String args[]) throws Exception {
FileOutputStream fos = new FileOutputStream("test");
MessageDigest md = MessageDigest.getInstance("SHA");
ObjectOutputStream oos = new ObjectOutputStream(fos);
String data = "thee";
byte buf[] = data.getBytes();
md.update(buf);
oos.writeObject(data);
oos.writeObject(md.digest());
}
}