Re: reading/writing myObject to a stream

Lew <>
Fri, 02 Feb 2007 18:15:50 -0500
<> wrote:

Hello, i have a client/server application and i would like to be able
to write to the serverSocket an object of type myObject and then from
the case of the server i would like to read it.

Knute Johnson wrote:

To send objects around on streams they need to be Serializable and you
use ObjectInputStream/ObjectOutputStreams to read and write them. wrote:

says sth about the reading/writing of objects that have static members,
but i didn't catch the point. Would there be a problem for these objects?

Knute Johnson wrote:

The docs appear to contradict themselves;

public final Object readObject()
                        throws IOException,

    Read an object from the ObjectInputStream. The class of the object,
the signature of the class, and the values of the non-transient and
non-static fields of the class and all of its supertypes are read.

So I can't answer your question. I'm sure somebody will chime up here
though to give you an answer.

There is no contradiction - the docs state that these methods do not handle
static fields. (Nor transient fields, but that's the point of "transient".)

The point of serializtion is to handle object state. It wouldn't make sense to
serialize or deserialize class state with an object. Class state belongs to
the whole class. The class will already have its state at the moment of object
serialization/deserialization; the object is expected to fit within that state.

An object that needs to influence class state during deserialization, say to
register itself, can do so in the readObject() method. It is possible that
such coupling between object and class state represents a design flaw.

- Lew

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