Java Tutorial : Java IO (Java Serialization_V5)

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What is Java Serialization?

In Java, Serialization is the process of converting the state of an object into a sequence of bytes. This byte stream can then be persisted into a file, stored in a database, or transmitted across a network to another JVM.

The reverse process—recreating the actual Java object from that byte stream in memory—is called Deserialization.

Core Classes and Interfaces

Java provides built-in support for object persistence in the java.io package through several key components:

• Serializable Interface: A marker interface (it has no methods or fields). A class must implement this interface to signal to the JVM that its instances can be safely serialized.
• ObjectOutputStream: A high-level processing stream that converts Java objects into byte streams using its writeObject() method.
• ObjectInputStream: Reads the raw byte stream and reconstructs the original object in memory using its readObject() method.

Why Do We Need Serialization?

• Persistence: Saves the exact state of objects to disk files or databases across application restarts.
• Deep Copying: Allows cloning complex, deeply nested object graphs by writing to and reading from a byte array.
• Network Communication & RMI: Facilitates transferring objects between different JVMs in distributed systems and microservices.

Important Concepts to Remember

• transient Fields: Fields marked with the transient keyword are excluded from serialization and receive default values upon deserialization.
• static Fields: Static variables belong to the class rather than an individual instance, so they are never saved in the serialized byte stream.
• serialVersionUID: A unique identifier that ensures class compatibility between the sender and receiver during deserialization.

Related Tutorials from Ram N Java

• What is Java ObjectOutputStream? | Java Serialization | Java IO | Java Tutorial
• What is Java ObjectInputStream? | Java Serialization | Java IO | Java Tutorial
• Java Serialization Rules Explained | Java IO | Java Tutorial

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Java Tutorial : Java IO (Java Serialization_V5) 

Java Tutorial : Java IO (Java Serialization_V5) 

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