Serializable Problem

[Damodar Mukhopadhyay]

Here is The code from the book of K&B Can Any one please tell me how we use the private methods??? how the private methods of Dog Class involbs??? :roll:

(shouts not necessary in topic title)
[ February 26, 2007: Message edited by: Barry Gaunt ]

[Damodar Mukhopadhyay]

This is rhe code..............




class Dog implements Serializable {
transient private Collar theCollar;
public int dogSize;
public Dog(Collar collar, int size) {
theCollar = collar;
dogSize = size;
}


public Collar getCollar() {return theCollar; }

private void writeObject( ObjectOutputStream os)
{
try {
os.defaultWriteObject();
os.writeInt(theCollar.getCollarSize());
}catch(Exception e) { e.printStackTrace(); }
}

private void readObject(ObjectInputStream is) {
try {
is.defaultReadObject();
theCollar = new Collar(is.readInt());
} catch (Exception e) {e.printStackTrace(); }
}
}//End of dog class

[Damodar Mukhopadhyay]

How the private readObject and writeObject methods are invocked...

[Nandu Jawale]

Through reflection. Java reflection provides fields, methods and constructors to be made accessible via setAccessible(boolean) method.

[Srinivasan thoyyeti]

Hi Damodar,

I appreciate you for imposing the Why.
I too don't know what happens exactly there.
Here is a hint that can happen.
Hope it will improve your thought process...

interface Catch{

private void display();
public void callDisplay();

}

class Try{

private void display() {
System.out.pritntln("I like the way you thinking");
}

pulic void callDisplay(){
display();
}

}

Cheers

[Srinivasan thoyyeti]

correction class Try implements Catch

[Srinivasan thoyyeti]

Hi,
I am sorry for the above example where i have written private method in interface.

I am also very curious to know how the private(readObject) method is accessed from Dog class.

Any suggestions welcome

[Damodar Mukhopadhyay]

It is still not clear to me...
My question is how the private methods are implemented and by whom?

[Anupam Sinha]

The method is invoked by the JVM. JVM can access your private methods. But other classes would not be able to access the same. Serializable is a marker interface having no methods. There are many methods you can have in your class which implements serializable to tell the JVM what to do at runtime with the method. A look at the api would be good. Here you go.

[Damodar Mukhopadhyay]

Thank You so much