Difference between serializable and externalizable is popular java interview question which we have touched on my earlier post on Serialization: Top 10 java serialization interview questions. knowing differences between externalizable and serializable is not just important from interview point of view but also getting control of serialization process and optimizing performance of serialization. both serializable and extenalizable used to serialize or persist java objects but the way they do is little different. In case of Serializable Java Virtual machine has full control for serializing object while in case of Externalizable, application gets control for persisting objects. writeExternal() and readExternal() method provides complete control on format and content of Serialization process to application which can be leverage to increase performance and speed of serialization process.
Difference between Serializable and Externalizable in Java Serialization
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