Deserialization of child classes

[Richard Chrenko]

How does one deserialize an object of subclass B (derived from superclass
A) if both require custom deserialization?

Does Java call only the readObject() Method of B, thus requiring me to
manually call super.readObject() to carry out the custom deserialization of
the superclass?

Or does Java call A.readobject() after instantiating superclass A and
subsequently call B.readObject() after instantiating the additional content
of subclass B?

 

[Lothar Kimmeringer]

How does one deserialize an object of subclass B (derived from superclass
A) if both require custom deserialization?

Does Java call only the readObject() Method of B, thus requiring me to
manually call super.readObject() to carry out the custom deserialization of
the superclass?

readObject is private, so it's not possible to call super.readObject(...).
If you implement java.io.Serialiable, all readObject-methods that
might exist, will be called by the VM. If you implement
java.io.Externalizable, you're responsible that all readExternal-
methods of superclasses are called. Because readExternal is
public it's not a problem to call super.readExternal(...)

Or does Java call A.readobject() after instantiating superclass A and
subsequently call B.readObject() after instantiating the additional content
of subclass B?

The VM should go from the uppermost class (in your example A)
to the lowermost class (in your example B).


Regards, Lothar
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Lothar Kimmeringer E-Mail: (e-mail address removed)
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