Java Tutorial : Java IO (Java Serialization with HAS A Inheritance) ~ foundjava

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

Address.java

import java.io.Serializable;

public class Address implements Serializable
{
    private static final long serialVersionUID = 8899023823185198093L;
    private String streetName;
    private String city;
    private String state;

    public Address(String streetName, String city, String state)
    {
        super();
        this.streetName = streetName;
        this.city = city;
        this.state = state;
    }

    public String getStreetName()
    {
        return streetName;
    }

    public void setStreetName(String streetName)
    {
        this.streetName = streetName;
    }

    public String getCity()
    {
        return city;
    }

    public void setCity(String city)
    {
        this.city = city;
    }

    public String getState()
    {
        return state;
    }

    public void setState(String state)
    {
        this.state = state;
    }

    @Override
    public String toString()
    {
        return "Address [streetName=" + streetName + ", city=" + city
                + ", state=" + state + "]";
    }

}

Employee.java

import java.io.Serializable;

/*
 * If a class has a reference of another class, all the
 * references must be Serializable otherwise
 * serialization process will not be performed. In such
 * case, NotSerializableException is thrown at runtime.
 * 
 * If Address is not Serializable, we cannot serialize
 * the instance of Employee class.
 */
public class Employee implements Serializable
{

    private static final long serialVersionUID = 765764534241652904L;
    private int id;
    private String name;
    private Address address; // HAS-A

    public Employee(int id, String name, Address address)
    {
        super();
        this.id = id;
        this.name = name;
        this.address = address;
    }

    public int getId()
    {
        return id;
    }

    public void setId(int id)
    {
        this.id = id;
    }

    public String getName()
    {
        return name;
    }

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

    public Address getAddress()
    {
        return address;
    }

    public void setAddress(Address address)
    {
        this.address = address;
    }

}

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);

            Address address = new Address("North Street", "Chennai",
                                                            "Tamil Nadu");

            Employee employee = new Employee(101, "Peter", address);

            /*
             * 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();
            }
        }

    }

}

Output

Successfully written employee object to the file.

employee.tmp

DeSerializationDemo.java

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("Id  = " + employee.getId());
            System.out.println("Name = " + employee.getName());
            Address address = employee.getAddress();
            System.out.println("Address  = " + address);
        }
        finally
        {

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

    }

}

Output

Successfully read employee object from the file.
Id  = 101
Name = Peter
Address  = Address [streetName=North Street, city=Chennai, state=Tamil Nadu]

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