import java.io.*;

class Moo implements Serializable {
  int v;
  public Moo() {}
  public Moo(int v) { this.v = v; }
  public void print(){ System.out.println("v = " + Integer.toHexString(v)); }
}


public class MooMain {
  public static void dumpToFile(Moo moo, String name){
    try {
      ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(name));
      oos.writeObject(moo);
    } catch(IOException ie){
      ie.printStackTrace();
    }
  }

  public static Moo restoreFromFile(String name){
    try {
      ObjectInputStream ois = new ObjectInputStream(new FileInputStream(name));
      return (Moo)ois.readObject();
    } catch(IOException ie){
      ie.printStackTrace();
    } catch(ClassNotFoundException cfe){
      cfe.printStackTrace();
    }
    return null;
  }

  public static void main(String[] args){
    Moo moo = new Moo(0x12345678);
    MooMain.dumpToFile(moo, "moo.txt");
    Moo moo2 = MooMain.restoreFromFile("moo.txt");
    moo2.print();
  }
}