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writeObject & readObject

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Hi folks

Someone on JavaRanch posted their notes of the Sierra & Bates Java 6 book.

In these notes they talk about:

private void writeObject(ObjectOutputSteam oo)
private void readObject(ObjectInputString oi)

Here's an example (I found online)

Where the heck to do these methods come from?

Is the whole point to using them instead of implementing Externalizable that Externalizable forces you to handle ALL serialization details while these methods don't?

Posts: 9671
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Hi Mark, first of all let me tell you serialization is not on the SCJP exam anymore. So you'll not get any question from this topic on the exam. That said if you read the documentation of java.lang.ObjectInputStream you'll find this

javadocs wrote:Serializable classes that require special handling during the serialization and deserialization process should implement the following methods:

private void writeObject(java.io.ObjectOutputStream stream)
throws IOException;
private void readObject(java.io.ObjectInputStream stream)
throws IOException, ClassNotFoundException;
private void readObjectNoData()
throws ObjectStreamException;

You can find more information regarding this on this page...
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