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java.awt.Component class implements the Serializable interface and any bean extending this class or any of its subclasses is automatically Serializable and hence can be persistent
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Note Object class is not Serializable and so one must inherit from a subclass of Object that is Serializable in order to automatically get this property
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One can explicitly implement the Serializable Interface by supplying writeObject() and readObject()
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Beans should store references to external Beans as transient as linkage is responsibility of BeanBox
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Externalizable Objects must implement writeExternal() and readExternal() methods for user implemented persistency
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