Serialization concept in java | how serialization work in java

Serialization in JAVA

Serialization in JAVA

Definition  :  java serialization is to write an object into a stream, so that it can be transported through a network and that object can be                  rebuilt again

Code :

   package core;

import java.io.FileInputStream; 
import java.io.FileNotFoundException; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import java.io.ObjectInputStream; 
import java.io.ObjectOutputStream; 
import java.io.Serializable; 
class SerializationBox implements Serializable { 

  private int serializableProp = 100;
 public int getSerializableProp() { 

    return serializableProp; 

  } 
 

} 

public class SerializationSample { 

public static void main(String args[]) throws IOException,  FileNotFoundException, ClassNotFoundException
  { 
    SerializationBox serialB = new SerializationBox(10); 
// serialization

   serialize("C:\\Temp\\kumud.txt", serialB); 
    System.out.println("After Serialize");

//deserialization
    SerializationBox sb = (SerializationBox) deSerialize("C:\\Temp\\kumud.txt"); 
    System.out.println(sb.getSerializableProp()); 
    System.out.println("Static Value"+sb.getStaticValue()); 

  } 

   public static void serialize(String outFile, Object serializableObject)  throws IOException { 

    FileOutputStream fos = new FileOutputStream(outFile); 
    ObjectOutputStream oos = new ObjectOutputStream(fos); 
    oos.writeObject(serializableObject); 

  } 

  

  public static Object deSerialize(String serilizedObject)  throws FileNotFoundException, IOException, ClassNotFoundException { 
    FileInputStream fis = new FileInputStream(serilizedObject); 
    ObjectInputStream ois = new ObjectInputStream(fis); 
    return ois.readObject(); 

  } 

}

Output :

After Serialize
100

in above code when we serialize object and save into file C:\\Temp\\kumud.txt file and when desrialize agiain readObject convert into object and return function value 100

Concept :  when you want to prevent to save the state during searialization , use Transient and static Key

package core;

import java.io.FileInputStream; 
import java.io.FileNotFoundException; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import java.io.ObjectInputStream; 
import java.io.ObjectOutputStream; 
import java.io.Serializable; 
class SerializationBox implements Serializable { 

  private int serializableProp = 100;
  private transient int b=800;
 
public int getSerializableProp() { 

    return serializableProp; 

  } 
  public int getNontransientValue() { 

     return b; 

   } 

} 

public class SerializationSample { 

public static void main(String args[]) throws IOException,  FileNotFoundException, ClassNotFoundException
  { 
    SerializationBox serialB = new SerializationBox(10); 
    serialize("C:\\Temp\\kumud.txt", serialB); 
    System.out.println("After Serialize");
    SerializationBox sb = (SerializationBox) deSerialize("C:\\Temp\\kumud.txt"); 
    System.out.println(sb.getSerializableProp()); 
    System.out.println("Transient Value"+sb. getNontransientValue); 

  } 

  

  public static void serialize(String outFile, Object serializableObject)  throws IOException { 

    FileOutputStream fos = new FileOutputStream(outFile); 
    ObjectOutputStream oos = new ObjectOutputStream(fos); 
    oos.writeObject(serializableObject); 

  } 

  

  public static Object deSerialize(String serilizedObject)  throws FileNotFoundException, IOException, ClassNotFoundException { 
    FileInputStream fis = new FileInputStream(serilizedObject); 
    ObjectInputStream ois = new ObjectInputStream(fis); 
    return ois.readObject(); 

  } 

}

Output :
After Serialize
100
Transient Value 0

Concept :

In above transient value does not save , so when we deserialize the coming value is 0,
so there is question coming in mind that is constructor is run during deserializtion