Difference between serialization and externalization

Can any body explain me the difference between serialization and externalization
with some example.

Have you tried google?
Serializable indicates that the object can be serialized by the default serializer, Externalizable means that the object itself will handle the serialization of the object.
/Kaj

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  • Difference between Serialization Vs Externalization

    hi can anyone tell me Difference between Serialization Vs Externalization

    Serialization is the process of converting an object into a sequence of bits so that it can be persisted on a storage medium (such as a file, or a memory buffer) or transmitted across a network connection link. This process of serializing an object is also called deflating or marshalling an object.
    The serialization mechanism has been added into the Java language for two reasons:
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    In order to serialize an object, you need the output stream OutputStream, which must be put into the special serialization stream called ObjectOutputStream. After that, you only need to call the method writeObject() to serialize the object and send it to the output stream. . Classes ObjectInputStream and ObjectOutputStream, which respectively implement the ObjectInput and ObjectOutput interfaces, enable entire objects to be read from or written to a stream (possibly a file). To use serialization with files, we initialize ObjectInputStream and ObjectOutputStream objects with stream objects that read from and write to files—objects of classes FileInputStream and FileOutputStream, respectively
    Vinayworld class implements serializable interface.
    Other class would be
    In this code object of the vinayworld class is serialized into a file name vinay.txt
    Serialization is a Marker interface -Marker Interface is used by java runtime engine (JVM) to identify the class for special processing.
    Use serialization when you need to add data to the serialization stream that is not an object data member.
    Externalization is same as Sterilization except that WriteObject() and ReadObject() method are called by JVM during sterilization an desterilization of object. One thing you can do with Externalization is that you can store extra information into object like STATIC variables and transient variables or you can add more information if you have any business need. One good example is compressing and uncompressing of data to send it through network or converting one format to other like a BMP image to JPEG or GIF format.
    Externalization allows you to customize how serialization is done. By implementing externalization you are controlling what gets serialized ( and what doesnot ) as versus default serialization where all non-transient attributes get serialized.
    For “fat data” classes with a large number of attributes only a few of which needs to persisted, externalization will help you reduce the size of serialized stream and the time taken to serialize the object. But there will be an overhead involved because the runtime has to call your methods to read/write objects.
    Read more: http://www.techartifact.com/blogs/2009/06/serialization-vs-externalization.html#ixzz2mWAYCMRz

  • Diff between Serialization and Synchronization

    Hi I am new to java.
    Pl. give me the difference between Serialization and Synchronization.
    Thankq
    Sridhar

    Don't you look at the timestamps of posts? They could
    have been typing at the same time.
    /KajPlease stop! I'll die laughing. LOL
    Re: Diff between Serialization and Synchronization
    Author: Annie.   Apr 11, 2005 10:30 AM (reply 1 of 4)  
    Re: Diff between Serialization and Synchronization
    Author: glrao   Apr 12, 2005 8:31 AM (reply 2 of 4) I really like your sense of humor.
    xH4x0r

  • Diff between Serialization and Synchonization

    Hi I am new to java.
    Pl. give me the difference between Serialization and Synchonization.
    Thankq
    Sridhar

    Pl. give me the difference between Serialization and
    Synchonization.Object serialization is the process of saving an object's state to a sequence of bytes, as well as the process of rebuilding those bytes into a live object at some future time. The Java Serialization API provides a standard mechanism for developers to handle object serialization.
    Synchronization is intended to make the code thread safe by setting locks on objects.
    They are totally different concepts. I fail to understand how you intend to compare them.

  • Differences between rfc and ale/idoc.

    hi ..
           will u please send the differences between rfc and ale/idoc's.

    Hi,
    Please reward with points if helpful................
    ALE is SAP proprietary technology that enables data communications between two or more SAP R/3 systems and/or R/3 and external systems. There are three layers in ALE system: application services, distribution services, and communication services.
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    Means of creating and operating distributed applications.
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    What is the difference between null and NULL?
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    Thanks,

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  • Difference between ok_code and sy-ucomm

    Hi,
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    Tushar-Patel wrote:
    I am trying to figure out the difference between abstraction and encapsulation but confused.
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  • What is difference between modify and update i am using

    hi
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    Arora

    Hi Nishant Arora,
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    http://help.sap.com/saphelp_nw70/helpdata/en/fc/eb35eb358411d1829f0000e829fbfe/content.htm
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    Edited by: Swamy Kunche on Jun 11, 2008 2:41 PM

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