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
