Which variables will and will not be restored with the appropriate values when an object is deserialized : Serialization « File « SCJP

1. SCJP
2. File
3. Serialization

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

public class MainClass {
  public static void main(String[] args) {
    Dog d = new Dog(35, "Fido");
    System.out.println("before: " + d.name + " " + d.weight);
    try {
      FileOutputStream fs = new FileOutputStream("testSer.ser");
      ObjectOutputStream os = new ObjectOutputStream(fs);
      os.writeObject(d);
      os.close();
    } catch (Exception e) {
      e.printStackTrace();
    }
    try {
      FileInputStream fis = new FileInputStream("testSer.ser");
      ObjectInputStream ois = new ObjectInputStream(fis);
      d = (Dog) ois.readObject();
      ois.close();
    } catch (Exception e) {
      e.printStackTrace();
    }

    System.out.println("after:  " + d.name + " " + d.weight);
  }
}

class Dog extends Animal implements Serializable {
  String name;

  Dog(int w, String n) {
    weight = w; // inherited
    name = n; // not inherited
  }
}

class Animal { // not serializable !
  int weight = 42;
}

before: Fido 35
after:  Fido 42