Transient keyword in java

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
 
/**
 * This program is used to show that transient variables 
 * are not saved in serialization process.
 * @author w3spoint
 */
class Student implements Serializable{
	//Serial Version UID.
	private static final long serialVersionUID = 1L;
	String name;
	transient String className;
	String rollNo;
 
	//Constructor.
	Student(String name, String className, String rollNo){
		this.name = name;
		this.className = className;
		this.rollNo = rollNo;
	}
}
 
class Test{
	//Write serialized object into objectoutputstream.
	public void objectSerialization(Student stu){
	 try{
           //Creating FileOutputStream object.
	   FileOutputStream fos = 
	    new FileOutputStream("F:\\New folder\\studentTransient.ser");
 
	    //Creating ObjectOutputStream object.
	    ObjectOutputStream oos = new ObjectOutputStream(fos);
 
	    //write object.
	    oos.writeObject(stu);
 
	    //close streams.
	    oos.close();
	    fos.close();
 
	    System.out.println("Serialized data is saved in " +
	       		"F:\\New folder\\studentTransient.ser");
 
        }catch(IOException e){
	          System.out.println(e);
	      }
	}
 
	//Deserialize a serialize object.
	public void objectDeSerialization(){
	  try{
	    Student stu = null;
	    //Creating FileOutputStream object.
	    FileInputStream fis = 
	     new FileInputStream("F:\\New folder\\studentTransient.ser");
 
	    //Creating ObjectOutputStream object.
	    ObjectInputStream ois = new ObjectInputStream(fis);
 
	    //write object.
	    stu = (Student) ois.readObject();
 
	    //close streams.
	    ois.close();
	    fis.close();
 
	    System.out.println("Name = " + stu.name);
	    System.out.println("Class Name = " + stu.className);
	    System.out.println("RollNo = " + stu.rollNo);
	   }catch(Exception e){
	          System.out.println(e);
	      }
	}	
}
 
public class TransientExample {
	public static void main(String args[]){	
		//Creating Student object.
		Student stu = 
                  new Student("Parmander", "MCA", "MCA/07/27");		
		//Creating Test object.
		Test obj = new Test();		
		//Method call.
		obj.objectSerialization(stu);
		obj.objectDeSerialization();		
	}
}

Serialized data is saved in F:\New folder\studentTransient.ser
Name = Parmander
Class Name = null
RollNo = MCA/07/27