WriteReplace method concept during Serialization in Java

WriteReplace method use by JVM during Serialization  to indentify the which object user want to searlize .

Below program for better understanding.

package Serlialization;

import java.io.Serializable;

class employee1  implements Serializable

{

      public String sname="king";

      int a;

      employee1()

      {

           

            System.out.println("superclas constructor run");

      }

      public void getNameEmployee1()

      {

            System.out.println("The employee1 getName Employee1");

      }

      /* public  Object readResolve() {

                System.out.println("Read Resolve method calling");

              throw new RuntimeException();

          }*/

     

}

public class employee  implements Serializable

{

      employee1 e= new employee1();

      String name="kumudg";

      int a;

      int c;

      transient int d;

      transient String password="password";

    static String age="raju";

    private Object writeReplace() {

        //System.out.println("The control in writeReplace method");

    return e;

      //return new SerializationProxy(this);

    }

   /*public  Object readResolve() {

        throw new RuntimeException();

    }*/

  public employee()

 

  {

        System.out.println("Inside the employee object contructor ");

  }

 

 

  public void getName()

  {

        System.out.println("Inside the getName method"+name);

       

  }

     

 

 

 

 

}

Serliaztion Test class

package Serlialization;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.ObjectInputStream;

import java.io.ObjectOutputStream;

import java.io.Serializable;

public class serializationTest {

public static void main(String [] args)

{

                serializationTest st= new serializationTest();

                employee e= new employee();

                //employee e=null;

                 st.serializedObject(e);

                //employee de=st.deserializedObject();

                //System.out.println("The value is "+de.name + de.age);

                //System.out.println("The transient value is "+de.password);

    //System.out.println("The transient value is "+de.sname);

               

}

public void serializedObject(employee e)

{

                try {

                                FileOutputStream out= new FileOutputStream("c://ser//ser.txt");

                                ObjectOutputStream outs= new ObjectOutputStream(out);

                                outs.writeObject(e);

                               

                } catch (FileNotFoundException e1) {

                                // TODO Auto-generated catch block

                                e1.printStackTrace();

                }

                catch (Exception e1) {

                                // TODO Auto-generated catch block

                                e1.printStackTrace();

                }

               

}

}

When programmer will serialize object then employee1 class’s object will searlize because the object return by WriteReplace method in Employee class returning object of Employee1