Vyoms OneStopTesting.com - Testing EBooks, Tutorials, Articles, Jobs, Training Institutes etc.
OneStopGate.com - Gate EBooks, Tutorials, Articles, FAQs, Jobs, Training Institutes etc.
OneStopMBA.com - MBA EBooks, Tutorials, Articles, FAQs, Jobs, Training Institutes etc.
OneStopIAS.com - IAS EBooks, Tutorials, Articles, FAQs, Jobs, Training Institutes etc.
OneStopSAP.com - SAP EBooks, Tutorials, Articles, FAQs, Jobs, Training Institutes etc.
OneStopGRE.com - of GRE EBooks, Tutorials, Articles, FAQs, Jobs, Training Institutes etc.
Bookmark and Share Rss Feeds

What is Serialization | Articles | Recent Articles | News Article | Interesting Articles | Technology Articles | Articles On Education | Articles On Corporate | Company Articles | College Articles | Articles on Recession
Sponsored Ads
Hot Jobs
Fresher Jobs
Experienced Jobs
Government Jobs
Walkin Jobs
Placement Section
Company Profiles
Interview Questions
Placement Papers
Resources @ VYOMS
Companies In India
Consultants In India
Colleges In India
Exams In India
Latest Results
Notifications In India
Call Centers In India
Training Institutes In India
Job Communities In India
Courses In India
Jobs by Keyskills
Jobs by Functional Areas
Learn @ VYOMS
GATE Preparation
GRE Preparation
GMAT Preparation
IAS Preparation
SAP Preparation
Testing Preparation
MBA Preparation
News @ VYOMS
Freshers News
Job Articles
Latest News
India News Network
Interview Ebook
Get 30,000+ Interview Questions & Answers in an eBook.
Interview Success Kit - Get Success in Job Interviews
  • 30,000+ Interview Questions
  • Most Questions Answered
  • 5 FREE Bonuses
  • Free Upgrades

VYOMS TOP EMPLOYERS

Wipro Technologies
Tata Consultancy Services
Accenture
IBM
Satyam
Genpact
Cognizant Technologies

Home » Articles » What is Serialization

What is Serialization








Article Posted On Date : Tuesday, February 23, 2010


What is Serialization
Advertisements

The basic concept of object serialization is the ability to read and write objects to byte streams. These streams can be used for saving session state information by servlets, for sending parameters for Remote Method Invocation (RMI) calls, for saving state information about JavaBean technology components, and for sending objects over the network, as well as many other tasks.

To do object serialization you use an ObjectOutputStream to save your objects and an ObjectInputStream to read them back. The serialization process deals with flattening out an object tree such that all the raw data that make up an object, including all the objects referenced by that object, get saved. And, when it's time to read back an object, the original object tree graph gets recreated. Special cases like circular references and multiple references to a single object are preserved such that when the tree graph gets recreated new objects don't magically appear where a reference to another object in the tree should be.

In order for an object to support the serialization process, the class must implement the Serializable interface. There are no methods in the interface; the interface just serves as a marker to say that a class can be serialized. However, just adding implements Serializable to a class definition doesn't automatically make a class Serializable. All the instance variables of said class must be Serializable, also. If they aren't and you try to serialize the class an exception would be thrown. To mark an instance variable as not for serialization, you add the transient keyword to the definition. Classes like java.awt.Image and java.lang.Thread, which contain platform-specific implementation information, are not Serializable and should be marked as transient.

transient Image image;


When you serialize an instance of a class, the only things that are saved are the non-static and non-transient instance data. Class definitions are not saved. They must be available when you try to deserialize an object.

The basic process of serializing an object is as follows:

ObjectOutputStream oos =
new ObjectOutputStream(anOutputStream);
Serializable serializableObject = ...
oos.writeObject(serializableObject);


Then, to read the the object back, deserialization, you do the reverse:

ObjectInputStream ois =
new ObjectInputStream(anInputStream);
Object serializableObject = ois.readObject();


The other thing that is frequently explained about serialization is overriding the readObject and writeObject methods to change the default serialization behavior. By overriding these methods you can provide additional information to the output stream, to be read back in at deserialization time:

private void writeObject(ObjectOutputStream oos)
    throws IOException {
  oos.defaultWriteObject();
  // Write/save additional fields
  oos.writeObject(new java.util.Date());
}

// assumes "static java.util.Date aDate;" declared
private void readObject(ObjectInputStream ois)
    throws ClassNotFoundException, IOException {
  ois.defaultReadObject();
  // Read/initialize additional fields
  aDate = (java.util.Date)ois.readObject();
}


One common reason to override readObject and writeObject is to serialize the data for a superclass that is not Serializable itself.

And, this is where most serialization explanations end.






Sponsored Ads



Interview Questions
HR Interview Questions
Testing Interview Questions
SAP Interview Questions
Business Intelligence Interview Questions
Call Center Interview Questions

Databases

Clipper Interview Questions
DBA Interview Questions
Firebird Interview Questions
Hierarchical Interview Questions
Informix Interview Questions
Microsoft Access Interview Questions
MS SqlServer Interview Questions
MYSQL Interview Questions
Network Interview Questions
Object Relational Interview Questions
PL/SQL Interview Questions
PostgreSQL Interview Questions
Progress Interview Questions
Relational Interview Questions
SQL Interview Questions
SQL Server Interview Questions
Stored Procedures Interview Questions
Sybase Interview Questions
Teradata Interview Questions

Microsof Technologies

.Net Database Interview Questions
.Net Deployement Interview Questions
ADO.NET Interview Questions
ADO.NET 2.0 Interview Questions
Architecture Interview Questions
ASP Interview Questions
ASP.NET Interview Questions
ASP.NET 2.0 Interview Questions
C# Interview Questions
Csharp Interview Questions
DataGrid Interview Questions
DotNet Interview Questions
Microsoft Basics Interview Questions
Microsoft.NET Interview Questions
Microsoft.NET 2.0 Interview Questions
Share Point Interview Questions
Silverlight Interview Questions
VB.NET Interview Questions
VC++ Interview Questions
Visual Basic Interview Questions

Java / J2EE

Applet Interview Questions
Core Java Interview Questions
Eclipse Interview Questions
EJB Interview Questions
Hibernate Interview Questions
J2ME Interview Questions
J2SE Interview Questions
Java Interview Questions
Java Beans Interview Questions
Java Patterns Interview Questions
Java Security Interview Questions
Java Swing Interview Questions
JBOSS Interview Questions
JDBC Interview Questions
JMS Interview Questions
JSF Interview Questions
JSP Interview Questions
RMI Interview Questions
Servlet Interview Questions
Socket Programming Interview Questions
Springs Interview Questions
Struts Interview Questions
Web Sphere Interview Questions

Programming Languages

C Interview Questions
C++ Interview Questions
CGI Interview Questions
Delphi Interview Questions
Fortran Interview Questions
ILU Interview Questions
LISP Interview Questions
Pascal Interview Questions
Perl Interview Questions
PHP Interview Questions
Ruby Interview Questions
Signature Interview Questions
UML Interview Questions
VBA Interview Questions
Windows Interview Questions
Mainframe Interview Questions


Copyright © 2001-2019 Vyoms.com. All Rights Reserved. Home | About Us | Advertise With Vyoms.com | Jobs | Contact Us | Feedback | Link to Us | Privacy Policy | Terms & Conditions
Placement Papers | Get Your Free Website | IAS Preparation | C++ Interview Questions | C Interview Questions | Report a Bug | Romantic Shayari | CAT 2019

Fresher Jobs | Experienced Jobs | Government Jobs | Walkin Jobs | Company Profiles | Interview Questions | Placement Papers | Companies In India | Consultants In India | Colleges In India | Exams In India | Latest Results | Notifications In India | Call Centers In India | Training Institutes In India | Job Communities In India | Courses In India | Jobs by Keyskills | Jobs by Functional Areas

Testing Articles | Testing Books | Testing Certifications | Testing FAQs | Testing Downloads | Testing Interview Questions | Testing Jobs | Testing Training Institutes

Gate Articles | Gate Books | Gate Colleges | Gate Downloads | Gate Faqs | Gate Jobs | Gate News | Gate Sample Papers | Gate Training Institutes

MBA Articles | MBA Books | MBA Case Studies | MBA Business Schools | MBA Current Affairs | MBA Downloads | MBA Events | MBA Notifications | MBA FAQs | MBA Jobs
MBA Job Consultants | MBA News | MBA Results | MBA Courses | MBA Sample Papers | MBA Interview Questions | MBA Training Institutes

GRE Articles | GRE Books | GRE Colleges | GRE Downloads | GRE Events | GRE FAQs | GRE News | GRE Training Institutes | GRE Sample Papers

IAS Articles | IAS Books | IAS Current Affairs | IAS Downloads | IAS Events | IAS FAQs | IAS News | IAS Notifications | IAS UPSC Jobs | IAS Previous Question Papers
IAS Results | IAS Sample Papers | IAS Interview Questions | IAS Training Institutes | IAS Toppers Interview

SAP Articles | SAP Books | SAP Certifications | SAP Companies | SAP Study Materials | SAP Events | SAP FAQs | SAP Jobs | SAP Job Consultants
SAP Links | SAP News | SAP Sample Papers | SAP Interview Questions | SAP Training Institutes |


Copyright ©2001-2019 Vyoms.com, All Rights Reserved.
Disclaimer: VYOMS.com has taken all reasonable steps to ensure that information on this site is authentic. Applicants are advised to research bonafides of advertisers independently. VYOMS.com shall not have any responsibility in this regard.