Java Serialization: Class 11

Difference Between Serialization and Externalization:

Serialization	Externalization
1) It is meant for defualt Serialization.	1) It is meant for customized Serialization.
2) Here Every thing takes care by JVM and Programmer doesn't have any control.	2) Here Everything takes care by Programmer and JVM doesn't have any control.
3) In Serialization total Object will be Saved to the file always whether it is required or not.	3) In Externalization Based on our requirement we can save either total Object or part of it.
4) Relatively Performance is low.	4) Relatively Performace is high.
5) Serialization is the best choice if we want to save total object to file.	5) Externalization is the best choice if we want to save part of the object to file.
6) Serializable Interface doesn't contain any method. It is marker Interface.	6) Externalizable interface contains 2 methods, writeExternal() and readExternal(). So it is not maker Interface.
7) Serializable implements class not required to contain public no-arguement constructor.	7) Externalizable implemented class should compulsory contain public no-arguement constructor. Otherwise, we will get RuntimeExcpetion Saying InvalidClassException.
8) tranisent keyword will play role in serialization	8) transient keyword won'y play any role in Externalization. Of course it is not required.

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