Difference between the Serializable and Externalizable interfaces

Serializable	Externalizable
Uses Java’s default serialization mechanism, which automatically serializes the object’s non-transient and non-static fields.	Gives the programmer control over the serialization process by providing the `readExternal` and `writeExternal` methods
Does not provide control over the serialization process, but it is easier to use.	Allows for a more efficient serialization process, but requires more work on the part of the programmer.
Meant for default serialization	meant for custom serialization
Everything taken care by JVM. Programmers does not have control	Every thing taken care by programmer
In serialization , Whole Object will be serialized and to control serialization, we need to use transient keyword.	Whole object or part of Object can be seriazable. transient keyword will have no effect.
Serialization class is not required to contain public no argument constructor	Externalizable class must contain public no argument constructor

To Read, More on Externalizable interface, Please read below:

Java Externalizable interface for custom serialization

Java Serialization Advanced Interview Questions

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