Why static variable serialized here?

[dolly shah]

import java.io.*;
public class TestSer {
    public static void main(String...args){
        SpecialSerial s=new SpecialSerial();
        try{
            ObjectOutputStream os=new ObjectOutputStream(new FileOutputStream("myfile"));
            os.writeObject(s);os.close();
            System.out.println(++s.z + "");
            ObjectInputStream ois=new ObjectInputStream(new FileInputStream("myfile"));
            SpecialSerial s2=(SpecialSerial)ois.readObject();
            ois.close();
            System.out.println(s2.y + "" + s2.z);
        } catch(Exception e){System.out.println("exc");}
    }
}
                                            class SpecialSerial implements Serializable{
                                                 transient int y=7;
                                                static int z=9;
 
                                             } 

This is a book example. Chapter:6, example:15, page:519.

Answers are:
(1) 10 0 10
(2) In order to alter the standard deserialization process you would implement the readObject() method in SpecialSerial.

I am not getting why serialised allows static variable? Also I am not getting what (2) answer wants to say.

[Priyam Srivastava]

static variables are not meant for serialization. but it if legal to have static variables in the class whose object you want to serialize.
here the static variable z doesn't get serialized..
[ July 12, 2007: Message edited by: Priyam Srivastava ]

[dolly shah]

In code "z" is a static variable & it gets change after serialized.

[Priyam Srivastava]

try to deserialize the object in any other file(try to write the deserialization process in file say Deserialize.java)...then observe whether the value of z changes or not.

by the way what value of z you expect??

[dolly shah]

I got it. But can you explain second answer?

[Priyam Srivastava]

I think it would be better if you go through Serialization topic once again from book K&B. you would understand better with example..

[Jared Folino]

It might be a bit clearer as well if you remember that s.z is shortcut syntax. The full statement would be SpecialSerial.z