Recently i gathered information
serializable:
is the super interface for the externalizable.
during deserialization, it doesnot call the construtor.
it follows the stored bits retrieval concept.
this is the marker interface.
externalizable:
extends serializable.
uses the constructor during the deserialization
contains two methods:writeExternal(),readExternal()
Cheers
Kurakula Sudhakar Reddy(Sudha).