is static variables serialized?

[Jomy George]

i have a doubt in serialization. i have read that static variables are not serialized.
but when i tested it does...?

import java.io.*;
import java.lang.Exception;

class Serializer
{
public static void main(String ... args)
	{
	try
		{
		
		Model obj = new Model();
		obj.a += 10;
		ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("myfile"));
		oos.writeObject(obj);
		oos.close();
		ObjectInputStream ois = new ObjectInputStream(new FileInputStream("myfile"));
		obj = (Model)ois.readObject();
		ois.close();
		System.out.println("a = "+obj.a);
		System.out.println("b = "+obj.b);
		}	
		catch(Exception e)
		{
		System.out.println(e);
		}
	}

}

class Model implements Serializable
{
static int a = 7;
transient int b = 11;
}

whats happening here?
does static variables saved on serialization?

thanks in advance....

[Prasad Kharkar]

This is not the question about serialization

STATIC VARIABLES ARE NOT SERIALIZED AT ALL


Always remember that static variable directly related to class and not the objects
see the code

import java.io.*;
import java.lang.Exception;

class Serializer
{
public static void main(String ... args)
	{
	try
		{
		
		Model obj = new Model();
		obj.a += 10;
		ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("myfile"));
		oos.writeObject(obj);
		oos.close();
		ObjectInputStream ois = new ObjectInputStream(new FileInputStream("myfile"));
		obj = (Model)ois.readObject();
		ois.close();
		System.out.println("a = "+ Model.a); // calling static variable on class name as usual
                System.out.println("a = " + obj.a); // calling static variable no object reference variable does not mean that it is of the new object
                // this just means that we are using reference of object to call the static member
                // this means, both [b]Model.a[/b] and [b]obj.a[/b] call the static variable a
		System.out.println("b = "+obj.b);
		}	
		catch(Exception e)
		{
		System.out.println(e);
		}
	}

}

class Model implements Serializable
{
static int a = 7; // this gets initialized when class is loaded and remember it is for the CLASS and not the OBJECT of class
transient int b = 11;
}

hence as variable a does not belong to object, it does not get serializable
when we are using obj.a it is same as Model.a which comes out to b 17


hope this helps

[Jomy George]

thanks Prasad Kharkar
got it

[Ankit Garg]

Remember, serialization is not on the SCJP exam anymore...

[Jomy George]

are you right Ankit Garg ?
new information for me. but Kathy Sierra book for SCJP6 has that topic in it?
can you give new latest syllabus please?

[Hareendra Reddy]

Hello Jomy George,
In addition to serialization concepts ,wait/notify/notifyAll concepts also have been removed from objectives..
Compare the objectives given in K&B with this objectives

[Shahrukh Naqui]

Hi,

The exam topics are listed on Oracle's OCPJP page


Does anyone know why Serialization was removed as an examinable topic?

[Jomy George]

thanks Ankit Garg and Hareendra

[Raghavan Muthu]

Shahrukh Naqui wrote:Hi,

The exam topics are listed on Oracle's OCPJP page


Does anyone know why Serialization was removed as an examinable topic?

May be because of the complexity? May be they wanted a change? there are so many options I do have when I thought of it..

Bert can answer this question

[Mohamed Omar Mukadam]

Hi all,

Is there in that case any topic/objective that is NOT covered in Sierra/Bates but has been added to the objectives?

Cheers.

[Raghavan Muthu]

Hello Mohammed Omar,

Welcome to JavaRanch

I do NOT think so!

[Mohamed Omar Mukadam]

Hi Raghavan,

You can never be too sure, right !?

Thanks for that

[Raghavan Muthu]

Mohamed Omar Mukadam wrote:Hi Raghavan,

You can never be too sure, right !?

Thanks for that

Hi Mohammed,

I did mean that there are no possibilities at all as Kathy Seirra and Bert Bates were official bearers of SCJP (now OCPJP) exams. So their book would definitely contain the entire and exact syllabus!

Hope this helps!!

[Mohamed Omar Mukadam]

Hello again Raghavan,

I understood your first reply, and appreciate the fact that sierra & Bates covers the whole exam.

Thanks again mate.

[Raghavan Muthu]

You are welcome Mohammaed! Glad indeed!