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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 ???

SCJP 1.5, SCEA, ICED (287,484,486)
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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