Java Program for Serialization, Deserialization

What is serialization in java program?

Serialization is the process of writing state of an object to a byte stream.
Serializable interface is to indicate that a class may be serialized.
Need to implement Serializable interface if class needs to be serialized.

Ho to do serialization in Java?

import java.io.*;                                                               

//Class can be serialized                                                                              
class Employee implements Serializable {                                        
 String name;                                                                   
 int id;                                                                        
 double salary;                                                                 
 public Employee(String name, int id, double salary) {                          
  this.name = name;                                                             
  this.id = id;                                                                 
  this.salary = salary;                                                         
 }                                                                              
 public String toString() {                                                     
  return "name=" + name + "; id=" + id + "; salary=" + salary;                  
 }                                                                              
}                                                                               
                                                                                
public class SerializationTest {                                                
 public static void main(String args[]) {                                       
  //Serialization of object                                                     
  try {                                                                         
   Employee obj = new Employee("Employee1", 1002, 5600.50);                     
   System.out.println("Employee Object:" + obj);                                
   FileOutputStream fout = new FileOutputStream("serial.txt");                  
   ObjectOutputStream oout = new ObjectOutputStream(fout);                      
   oout.writeObject(obj);                                                       
   oout.flush();                                                                
   oout.close();                                                                
  } catch(Exception ex) {                                                       
    System.out.println("Error: " + ex.toString());                              
  }                                                                             
 }                                                                              
}  

Output:

$ javac SerializationTest.java
$ java SerializationTest
Employee Object:name=Employee1; id=1002; salary=5600.5

and also serial.txt file is created with encrypted format of object data.

How to do deserialization in Java program?

Deserialization is the process to restore all of the objects correctly.

import java.io.*;                                                               
                                                                                
class Employee implements Serializable {                                        
 String name;                                                                   
 int id;                                                                        
 double salary;                                                                 
 public Employee(String name, int id, double salary) {                          
  this.name = name;                                                             
  this.id = id;                                                                 
  this.salary = salary;                                                         
 }                                                                              
 public String toString() {                                                     
  return "name=" + name + "; id=" + id + "; salary=" + salary;                  
 }                                                                              
}                                                                               
                                                                                
public class DeserializationTest {                                              
 public static void main(String args[]) {                                       
  //Deserialization of object                                                   
  try {                                                                         
   FileInputStream fis = new FileInputStream("serial.txt");                     
   ObjectInputStream ois = new ObjectInputStream(fis);                          
   Employee obj = (Employee)ois.readObject();                                   
   ois.close();                                                                 
   System.out.println("Employee Object: " + obj);                               
  } catch(Exception ex) {                                                       
    System.out.println("Error: " + ex.toString());                              
  }                                                                             
 }                                                                              
}    

Output:

$ javac DeserializationTest.java 
$ java DeserializationTest
Employee Object: name=Employee1; id=1002; salary=5600.5

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