Abstract

This example shows how to evolve a persistent format using the Externalizable interface. A class that uses the Externalizable interface is responsible for saving its own state, for saving the state of its supertype, and for versioning (including skipping over data).

This example specifically deals with versioning. For information about saving the state of the supertype, which may or may not be Externalizable, see the following examples:

• Serialization with a NonSerializable Superclass
• Externalization with an Externalizable Superclass
• Externalization with a NonExternalizable Superclass

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