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Using Externalization?

Anil Vupputuri
Ranch Hand

Joined: Oct 31, 2000
Posts: 527
What is the diff b/w Serialization and Externalization,At what occasion Externalization can be useful.As in Serialization ,Serialized object can be deserialized and does the same thing applies to Externalization ???

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Ajith Kallambella

Joined: Mar 17, 2000
Posts: 5782
Externalization takes serialization one step further. <code>Externalizable</code> is an interface that extends <code>Serializable</code>. Classes can implement <code>Externalizable</code> interface and gain the fine-grain control over the way the object gets serialized by overriding <code>readExternal(ObjectInput in)</code> and <code>writeExternal( OjbectOutput out )</code> methods.
During serialization, if the class implements <code>Externalizable</code>, then the overridden methods are called. On the otherhand, if the class implements only <code>Serializable</code>, you'll get the plain vanilla object serialization.


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