File APIs for Java Developers
Manipulate DOC, XLS, PPT, PDF and many others from your application.
http://aspose.com/file-tools
The moose likes Beginning Java and the fly likes Serializable interface implementation Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login


Win a copy of Murach's Java Servlets and JSP this week in the Servlets forum!
JavaRanch » Java Forums » Java » Beginning Java
Bookmark "Serializable interface implementation" Watch "Serializable interface implementation" New topic
Author

Serializable interface implementation

Mansukhdeep Thind
Ranch Hand

Joined: Jul 27, 2010
Posts: 1157

Hi

Whenever we implement the Serializable interface while writing a JavaBean class, I have seen that invariably it contains the following line of code:



What is the meaning of and purpose of writing this?


~ Mansukh
harshvardhan ojha
Ranch Hand

Joined: Jul 26, 2007
Posts: 157
    
    1

This is meant to keep version for your class so that it won't try to deserialize objects having incompatible versions. otherwise it will throw InvalidClassExceptions for incompatible versions.
Campbell Ritchie
Sheriff

Joined: Oct 13, 2005
Posts: 37902
    
  22
That actually means that you are using an IDE where you have set an option to include an “default” SUID number in every Serializable class. I think you should take that option off.

Look here, where you will find links to discussion of serialisation, which will help explain what an SUID is.
Campbell Ritchie
Sheriff

Joined: Oct 13, 2005
Posts: 37902
    
  22
Another discussion here. See which is the links I quoted is better.
 
It is sorta covered in the JavaRanch Style Guide.
 
subject: Serializable interface implementation
 
Similar Threads
Serielizible?
Can we find the code which makes the object serializable?
6 Qs
Class Casting
Marker Interface