Serialization Demo

SerializationDemo.java

/*
 * Serialization Demo
 *
 * Serialization is a process of writing a state of an object to a ByteString.
 * Deserialization is a process of reading state of an object from a file.
 *
 * Notes:
 *  - Only objects of class which implements the serializable interface can be serialized.
 *
 * Usage:
 *   javac SerializationDemo.java
 *   java SerializationDemo
 *   java DeSerializationDemo
 */

import java.io.*;

class Employee implements Serializable {
  private int id;
  private String name;
  private String role;

  public Employee() {
    id = 100;
    name = "Krish";
    role = "Trainer";
  }

  public void display() {
    System.out.println(id+ " " + name + " " + role);
  }
}

class SerializationDemo {
  public static void main(String[] args) throws Exception {
    Employee e1 = new Employee();

    System.out.println("Before Serialization:");
    e1.display();

    FileOutputStream fos = new
    FileOutputStream("NewObject.dat");

    ObjectOutputStream oos = new
    ObjectOutputStream(fos);

    oos.writeObject(e1);

    System.out.println("Object has been serialized.");
  }
}

class DeSerializationDemo {
  public static void main(String[] args) throws Exception {

    FileInputStream fis = new
    FileInputStream("NewObject.dat");

    ObjectInputStream ois = new
    ObjectInputStream(fis);

    Employee e1 = (Employee) ois.readObject(); // Reads the object.

    System.out.println("After DeSerialization:");

    e1.display();
  }
}