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Serializable vs Externalizable What is the difference between Serializable and Externalizable in Java is famous core Java interview questions and for some of them its one of those difficult Java question, which no one wants to see in Java interview. I was in that category until I explored How Serialization works in Java and find out more about the Serialization process.
What makes Serialization questions tricky is, Serialization as a persistence mechanism is not very popular. Table of Contents. Save Article. Improve Article. Like Article. String name;. FileOutputStream fos. ObjectOutputStream oos. That's a very simple usecase, nothing "special" or "unique".
NotSerializableException : packageName. ClassName « To participate a Class Object in serialization process, The class must implement either Serializable or Externalizable interface.
Serializable Interface Object Serialization produces a stream with information about the Java classes for the objects which are being saved. The Serializable interface is defined to identify classes which implement the serializable protocol: package java. JVM will have complete control in serializing the object. Here serializable objects is reconstructed directly from the stream without executing InvalidClassException « In deserialization process, if local class serialVersionUID value is different from the corresponding sender's class.
InvalidClassException: com. Externalizable Interface For Externalizable objects, only the identity of the class of the object is saved by the container; the class must save and restore the contents. The Externalizable interface is defined as follows: package java. Programmer has to take care of which objects to be serialized. As a programmer take care of Serialization So, here transient keyword will not restrict any object in Serialization process.
When an Externalizable object is reconstructed, an instance is created using the public no-arg constructor, then the readExternal method called. Serializable objects are restored by reading them from an ObjectInputStream. NotSerializableException: com. Address objectOut. Yash Yash 7, 2 2 gold badges 62 62 silver badges 67 67 bronze badges.
Ali Joudeh Ali Joudeh 71 1 1 silver badge 1 1 bronze badge. Ravindra babu Ed Staub Ed Staub 15k 3 3 gold badges 56 56 silver badges 88 88 bronze badges. This way our validation methods will be automatically called by JVM, immediately after default serialization and deserialization process happens.
Ashish Sharma Ashish Sharma 5 5 silver badges 14 14 bronze badges. Could you elaborate it more? As I read it, I don't understand what you are trying to say. Also, if you could format the text with some paragraphs and examples, this could be a great answer. Pika the Master of the Whales Pika the Master of the Whales 3, 8 8 gold badges 24 24 silver badges 40 40 bronze badges. Neeraj Neeraj 1 1 silver badge 9 9 bronze badges. The Overflow Blog. Podcast Explaining the semiconductor shortage, and how it might end.
Does ES6 make JavaScript frameworks obsolete? Featured on Meta. Now live: A fully responsive profile. Linked 5. See more linked questions. Related Hot Network Questions. Question feed. Stack Overflow works best with JavaScript enabled. Dashboard Logout. Externalization contains two methods readExternal and writeExternal.
The class which is implementing this interface gives the responsibility to JVM for serializing or persist java object. JVM use readObject and writeObject for serialization. Externalization provides implementation logic control to the application by overriding readExternal and writeExternal methods.
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