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Java Tutorial : Java IO (Java Serialization with IS A Inheritance)

Person.java

import java.io.Serializable;

/*
 * If a class implements serializable then all its sub
 * classes will also be serializable.
 */
public class Person implements Serializable
{

    private static final long serialVersionUID = -7438582605700356851L;
    protected String name;
    protected int age;

    public Person(String name, int age)
    {
        super();
        this.name = name;
        this.age = age;
    }

    public String getName()
    {
        return name;
    }

    public void setName(String name)
    {
        this.name = name;
    }

    public int getAge()
    {
        return age;
    }

    public void setAge(int age)
    {
        this.age = age;
    }

}

Employee.java

/*
 * We can serialize the Employee class object that
 * extends the Person class which is Serializable.Parent
 * class properties are inherited to subclasses so if
 * parent class is Serializable, subclass would also be.
 */
public class Employee extends Person
{

    private static final long serialVersionUID = 312396230370712755L;
    private int salary;

    public Employee(String name, int age, int salary)
    {
        super(name, age);
        this.salary = salary;
    }

    public int getSalary()
    {
        return salary;
    }

    public void setSalary(int salary)
    {
        this.salary = salary;
    }

}

SerializationDemo.java

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;

public class SerializationDemo
{

    public static void main(String[] args) throws FileNotFoundException,
            IOException, ClassNotFoundException
    {
        SerializationDemo serializationDemo = new SerializationDemo();
        serializationDemo.writeEmployeeObject();
    }

    private void writeEmployeeObject() throws FileNotFoundException,
            IOException
    {
        FileOutputStream fileOutputStream = null;
        ObjectOutputStream objectOutputStream = null;
        try
        {
            fileOutputStream = new FileOutputStream("employee.tmp");
            objectOutputStream = new ObjectOutputStream(fileOutputStream);

            Employee employee = new Employee("Peter", 29, 80000);

            /*
             * Write the specified object to the
             * ObjectOutputStream.
             */
            objectOutputStream.writeObject(employee);
            System.out
                    .println("Successfully written employee object to the file.\n");
        }
        finally
        {

            if (objectOutputStream != null)
            {
                /*
                 * Closing a ObjectOutputStream will also
                 * close the OutputStream instance to which
                 * the ObjectOutputStream is writing.
                 */
                objectOutputStream.close();
            }
        }

    }

}

Successfully written employee object to the file.

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.ObjectInputStream;

public class DeSerializationDemo
{

    public static void main(String[] args) throws FileNotFoundException,
            IOException, ClassNotFoundException
    {
        DeSerializationDemo deSerializationDemo = new DeSerializationDemo();
        deSerializationDemo.readEmployeeObject();
    }

    private void readEmployeeObject() throws IOException,
            FileNotFoundException, ClassNotFoundException
    {
        FileInputStream fileInputStream = null;
        ObjectInputStream objectInputStream = null;

        try
        {
            fileInputStream = new FileInputStream("employee.tmp");
            objectInputStream = new ObjectInputStream(fileInputStream);

            /*
             * Read an object from the ObjectInputStream.
             */
            Employee employee = (Employee) objectInputStream.readObject();

            System.out
                    .println("Successfully read employee object from the file.");

            System.out.println("Name = " + employee.getName());
            System.out.println("Age  = " + employee.getAge());
            System.out.println("Salary  = " + employee.getSalary());
        }
        finally
        {

            if (objectInputStream != null)
            {
                /*
                 * Closing a ObjectInputStream will also
                 * close the InputStream instance from which
                 * the ObjectInputStream is reading.
                 */
                objectInputStream.close();
            }
        }

    }

}