Knowing the difference between Externalizable and Serializable is essential as an interview question and we can use the knowledge to make better-informed decisions for performance improvement for applying serialization to our application.
1. Externalizable Vs. Serializable
|Mostly, default serialization is easy to implement, but has a higher performance cost.||Serialization done using |
|It’s hard to analyze and modify class structure because any change may break the serialization.||It’s easier to analyze and modify class structure because of complete control over serialization logic.|
|Default serialization does not call any class constructor.||A public no-arg constructor is required while using |
Please note that
Externalizable interface is the child interface of Serializable i.e. Externalizable extends Serializable. So if any class implements Externalizable interface and overrides its writeExternal() and readExternal() methods then the first preference is given to these methods over the default serialization mechanism provided by JVM.
2. Read More about Externalizable and Serializable
- More Efficient Serialization with Externalizable in Java
- Java Serializable Interface Implementation Guide
- How Deserialization Process Happen in Java?
Drop me your questions in the comments section related to Externalizable and Serializable interfaces in Java.
Happy Learning !!