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serialization

5 replies on 1 page. Most recent reply: Sep 18, 2003 3:52 AM by Senthoorkumaran Punniamoorthy

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Leela

Posts: 16
Nickname: leee
Registered: Sep, 2003

serialization Posted: Sep 16, 2003 6:39 AM
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i need to know, what exactly object serialization means and where should it be used and where not???


David

Posts: 150
Nickname: archangel
Registered: Jul, 2003

Re: serialization Posted: Sep 16, 2003 7:14 AM
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It's the creation of a persistent version of an object(s) which may be stored in, for example, a file.

mausam

Posts: 243
Nickname: mausam
Registered: Sep, 2003

Re: serialization Posted: Sep 16, 2003 7:58 AM
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http://www.javacaps.com/java_serial.html

http://developer.java.sun.com/developer/technicalArticles/ALT/serialization/

Serializing an object involves encoding its state in a structured way within a byte array. Once an object is serialized, the byte array can be manipulated in various ways; it can be written to a file, sent over a network using a socket-based connection or RMI, or persisted within a database as a BLOB.
The serialization process encodes enough information about the object type within the byte stream, allowing the original object to be easily recreated upon deserialization, at a later point in time.

Leela

Posts: 16
Nickname: leee
Registered: Sep, 2003

Re: serialization Posted: Sep 17, 2003 11:16 PM
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But, cant the objects be directly written to and read from the file using ObjectInputStream and ObjectOutputStream???

David

Posts: 150
Nickname: archangel
Registered: Jul, 2003

Re: serialization Posted: Sep 18, 2003 12:31 AM
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What made you think that ObjectInputStream and ObjectOutputStream weren't anything to do with Serialization?

From the ObjectOutputStream API:

"An ObjectOutputStream writes primitive data types and graphs of Java objects to an OutputStream. The objects can be read (reconstituted) using an ObjectInputStream. Persistent storage of objects can be accomplished by using a file for the stream. If the stream is a network socket stream, the objects can be reconsituted on another host or in another process."

"Only objects that support the java.io.Serializable interface can be written to streams. The class of each serializable object is encoded including the class name and signature of the class, the values of the object's fields and arrays, and the closure of any other objects referenced from the initial objects."

http://java.sun.com/j2se/1.3/docs/api/java/io/ObjectOutputStream.html

Senthoorkumaran Punniamoorthy

Posts: 335
Nickname: senthoor
Registered: Mar, 2002

Re: serialization Posted: Sep 18, 2003 3:52 AM
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Leela,

Thats posible, however only requirement is that object being written should implement java.io.Serializable interface

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