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What is Externalizable in Java?
Externalization is used whenever we need to customize serialization mechanism. If a class implements an Externalizable interface then, object serialization will be done using writeExternal() method.
Whereas at receiver’s end when an Externalizable object is a reconstructed instance will be created using no argument constructor and then the readExternal() method is called.
If a class implements only Serializable interface object serialization will be done using ObjectoutputStream.
At the receiver’s end, the serializable object is reconstructed using ObjectInputStream.
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