import java.io.ObjectOutputStream;

import java.io.ObjectInputStream;

import java.io.FileOutputStream;

import java.io.FileInputStream;

import java.io.IOException;

import java.io.Externalizable;

import java.io.ObjectOutput;

import java.io.ObjectInput;

public class SerializationDemo3{

private static final String FILE_PATH = "emps.dat";

public static void main(String[] args){

ObjectOutputStream oos = null;

ObjectInputStream ois = null;

try{

FileOutputStream fos = new FileOutputStream(FILE_PATH);

oos = new ObjectOutputStream(fos);

Employee emp = new Employee("John Doe", 36);

oos.writeObject(emp);

oos.close();

oos = null;

FileInputStream fis = new FileInputStream(FILE_PATH);

ois = new ObjectInputStream(fis);

emp = (Employee)ois.readObject();

System.out.println("Deserialization: " + emp.getName());

System.out.println("Deserialization: " + emp.getAge());

}catch(IOException ioe){

ioe.printStackTrace();

}catch(ClassNotFoundException cnfe){

cnfe.printStackTrace();

}finally{

if(oos != null){

try{

oos.close();

}catch(IOException ioe){

ioe.printStackTrace();

}

}

if(ois !=null){

try{

ois.close();

}catch(IOException ioe){

ioe.printStackTrace();

}

}

}

}

}

class Employee implements Externalizable{

private String name;

private int age;

// No argument constructor is necessary for deserialization through Externalizable-oriented serialization mechanism.

public Employee(){

}

public Employee(String name, int age){

this.name = name;

this.age = age;

}

public String getName(){

return name;

}

public int getAge(){

return age;

}

public void writeExternal(ObjectOutput out) throws IOException{

System.out.println("writeExternal is called.");

out.writeUTF(name);

out.writeInt(age);

}

public void readExternal(ObjectInput in) throws IOException{

System.out.println("readExternal is called.");

this.name = in.readUTF();

this.age = in.readInt();

}

}