This document discusses object serialization in Java. Serialization is the process of converting an object's state into a byte stream to store or transmit the object. Deserialization reconstructs the object from the byte stream. The Student class implements the Serializable interface, allowing its objects to be serialized. ObjectOutputStream writes objects to an output stream, while ObjectInputStream deserializes objects from an input stream and reconstructs the object. An example demonstrates serializing a Student object to a file and then deserializing and printing its attributes.

1. Object Serialization in Java
• Serialization in java is a mechanism of writing
the state of an object into a byte stream.
• It is mainly used in Hibernate, RMI, JPA, EJB
and JMS technologies.
• The reverse operation of serialization is called
deserialization.
• Advantage of Java Serialization
• It is mainly used to travel object's state on the
network (known as marshaling).

3. java.io.Serializable interface
import java.io.Serializable;
public class Student implements Serializable
{
int id;
String name;
public Student(int id, String name) {
this.id = id;
this.name = name;
}
}
• In the above example, Student class implements Serializable
interface. Now its objects can be converted into stream.

4. ObjectOutputStream class
• The ObjectOutputStream class is used to write
primitive data types and Java objects to an
OutputStream. Only objects that support the
java.io.Serializable interface can be written to
streams.

5. import java.io.*;
class Depersist{
public static void main(String args[])throws Exception{
ObjectInputStream in=new ObjectInputStream(new FileInputStream("f.txt"))
;
Student s=(Student)in.readObject();
System.out.println(s.id+" "+s.name);
in.close();
}
}
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6. Deserialization in java
• Deserialization is the process of reconstructing the object
from the serialized state.It is the reverse operation of
serialization.
ObjectInputStream class
• An ObjectInputStream deserializes objects and primitive data
written using an ObjectOutputStream.

7. Example of Java Deserialization
import java.io.*;
class Depersist{
public static void main(String args[])throws Exception{
ObjectInputStream in=new ObjectInputStream(new FileInputStream("f.txt"))
;
Student s=(Student)in.readObject();
System.out.println(s.id+" "+s.name);
in.close();
}
}
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8. (Internet Inter-ORB Protocol)
• IIOP (Internet Inter-ORB Protocol) is a protocol
that makes it possible for distributed
programs written in different programming
languages to communicate over the Internet.

9. • The distributed Hello World example uses a
client application to make a remote method
call via IIOP to a server running on the host
from which the client was downloaded. When
the client runs, "Hello from MARS!" is
displayed.

10. • The steps to write the source files
• The steps to compile the example
• The steps to run the example
Write or Download the Source Files
There are three tasks to complete in this section:
• Define the functions of the remote class as an interface
written in the Java programming language
• Write the implementation class
• Write the server class
• Write a client program that uses the remote service

11. • The source files used in this tutorial are:
HelloInterface.java - a remote interface
• HelloImpl.java - a remote object implementation
that implements HelloInterface
• HelloServer.java - an RMI server that creates an
instance of the remote object implementation
and binds that instance to a name in the Naming
Service
• HelloClient.java - a client application that invokes
the remote method, sayHello()