Java / serialize and deserialize object

Serialization is the process of translating data structures or object state into a format that can be stored (for example, in a file or memory buffer, or transmitted across a network connection link) and "resurrected" later in the same or another computer environment. From Wikipedia


In our example we have got class Person which is implementing Serializable interface. It is needed for serialization our Person class.

In line #42 we are starting serialization and writing serialized data to the file.

In line #64 we are starting reading data from file and then data is deserialized.

It is very simple.

package p_2013_04_03;

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


class Person implements java.io.Serializable
{
 private static final long serialVersionUID = 1L;
 
 private String name;
 private int 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;
 }
}


public class MySerialization 
{

 public static void main(String[] args) 
 {
  Person john = new Person();
  john.setName("John");
  john.setAge(30);       
  
  // serialize and write serialized data to the file
  FileOutputStream fos = null;
  ObjectOutputStream oos = null;
     
  try 
  {
   fos = new FileOutputStream("person.txt");
   oos = new ObjectOutputStream(fos);
   
   oos.writeObject(john);
   fos.close();
   oos.close();
  } 
  catch (FileNotFoundException e) 
  {  
   e.printStackTrace();
  } 
  catch (IOException e) 
  { 
   e.printStackTrace();
  }
  
  // Read serialized data from the file and deserialize 
  FileInputStream fis = null;
  ObjectInputStream ois = null;
  Person desPersonJohn = new Person();   
  
  try 
  {
   fis = new FileInputStream("person.txt");
   ois = new ObjectInputStream(fis);
      
   desPersonJohn = (Person)ois.readObject();
  } 
  catch (FileNotFoundException e) 
  {  
   e.printStackTrace();
  } 
  catch (IOException e) 
  {  
   e.printStackTrace();
  } 
  catch (ClassNotFoundException e) 
  {  
   e.printStackTrace();
  }
  
  System.out.println(desPersonJohn.getName() + " " + desPersonJohn.getAge());  
 }
}