Re: Help with serialization

Christo wrote:
as part of a project at uni i have been asked to provide object persistance through files

I have opted for serialization

my question is quite simple

when u use serialization is an object saved to a single file or are more than one object(s) saved to a single file?

say i have three objects, will they all be saved into one file or will there be three seperate files each having one object saved into them?

also say i have a superclass implmenting the java.io.Serializable

will all subclasses of that superclass automatically implement the java.io.Serializable or will i need to make those subclasses implement the Serializable seperately?

any help would be appreciated

PS -
public class UserData implements java.io.Serializablei understand that but..public class UserData extends User...how would i implement the java.io.Serializable in that class? would it be...public class UserData implements java.io.Serializable extends UserORpublic class UserData extends User implements java.io.SerializableThanks in advanceChristo



Serialization is about converting objects into Streams of reconstitutable data. What you do with the stream is up to you. Also, once a class implements an interface all subclasses automatically implement it.

Java API Javadocs are your friend:
http://java.sun.com/j2se/1.4.2/docs/api/java/io/ObjectOutputStream.html

Another thing to look up is the java keyword "transient"
.

Relevant Pages

  • Help with serialization
    ... when u use serialization is an object saved to a single file or are more ... java.io.Serializable or will i need to make those subclasses implement the ... but..public class UserData extends User...how would i implement the ... implements java.io.Serializable extends UserORpublic class UserData extends ...
    (comp.lang.java)
  • Multiple Object Serialization seperately in single file (something like olestorages)
    ... Everything is kept with in a single file. ... Seperate storages for each module help tremendously because ... ps. i've looked at the general serialization procedure in .net but ...
    (microsoft.public.dotnet.languages.csharp)