question reg. Serialization process

[Poornachandran R]

Hai,
An article from Sun reg the same can be found here
http://developer.java.sun.com/developer/technicalArticles/Programming/serialization/
I have some doubts:
public class A implements Serializable {
private void writeObject(ObjectOutputStream out) throws IOException
{
out.defaultWriteObject();
}
private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException
{
in.defaultReadObject();
}
}
In the above example,
1) Can I give the following line just after line of the method writeObject.
out = new ObjectOutputStream(fos); // assume fos - FileOutputStream.
2) What is the difference between this approach and Externalizable ? Because, in both the approaches we define our own way of how Object is written and read.
Poornachandran

[Michael Morris]

Hi Poornachandran,
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