Serialization question from K&B test

[Sarada Bikkina]

can anyone please explain me the working of the program given below.
why is the output :p cp instead of pc or pcpc?

 
import java.io.*;
class Player { 
  Player() { System.out.print("p"); }
}
class CardPlayer extends Player implements Serializable {
  CardPlayer() { System.out.print("c"); }
  public static void main(String[] args) {
    CardPlayer c1 = new CardPlayer();
    try {
      FileOutputStream fos = new FileOutputStream("play.txt");
      ObjectOutputStream os = new ObjectOutputStream(fos);
      os.writeObject(c1);
      os.close();
      FileInputStream fis = new FileInputStream("play.txt");
      ObjectInputStream is = new ObjectInputStream(fis);
      CardPlayer c2 = (CardPlayer) is.readObject();
      is.close();
    } catch (Exception x ) { }
  }
}

Thanks in advance
[ January 17, 2007: Message edited by: Barry Gaunt ]

[Sanjeev Singh]

import java.io.*;
class Player {
    Player() { System.out.print("p"); }   //1
}
public class CardPlayer extends Player implements Serializable {
    CardPlayer() { 
        System.out.print("c"); }   //2
    public static void main(String[] args) {
        CardPlayer c1 = new CardPlayer();      //3
        try {
            FileOutputStream fos = new FileOutputStream("play.txt");
            ObjectOutputStream os = new ObjectOutputStream(fos);
            os.writeObject(c1);
            os.close();
            FileInputStream fis = new FileInputStream("play.txt");
            ObjectInputStream is = new ObjectInputStream(fis);
            CardPlayer c2 = (CardPlayer) is.readObject(); //4
            is.close();
        } catch (Exception x ) {
            System.out.println(x);
        }
    }
}

//CardPlayer creation at 2 will call the super() and SOP at //1 will printed then SOP at //2.When the object is deserialized the objects no-args super constructors runs i.e. //1.If not zero argument constuctor exists then it throws a InvalidClassException.

[Sarada Bikkina]

why is the output not pcpc?i didnt not get any exception when the above program didnt have any constructors.can you be brief about the functionality?

[Sanjeev Singh]

why is the output not pcpc?

Output as pcpc means you are running the constructor of the CardPlayer and initializing the state of the object which is just deserialized,so the state after the deserialization is lost.

i didnt not get any exception when the above program didnt have any constructors.

There must be a no-argument constructor or a default constructor else a runtime excetpion will generate.
[ January 17, 2007: Message edited by: Sanjeev Kumar Singh ]