Hibernate Many to Many Update Operation

// For SQL and POJO see the Many to Many Insert Operation
import java.util.Set;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
public class HibernateEngine {

public static void main(String[] javaPlanet)
{
System.out.println(" ....... ENGINE START ............");

System.out.println(" .. MANY TO MANY ANNOTATION UPDATE LESSON ..\n");
Configuration cfg = new Configuration();
cfg.configure("hibernate.cfg.xml");
SessionFactory factory = cfg.buildSessionFactory();
Session session = factory.openSession();

User userObj = (User) session.get(User.class, new Integer(2));
userObj.setName("Dharm");

Set<MobilePhone> mobilePhoneSet = userObj.getMobilePhones();
for(MobilePhone phone:mobilePhoneSet){
if(phone.getModelNumber()==11)
    phone.setName("SAMSUNG galaxy NOTE");
}
userObj.setMobilePhones(mobilePhoneSet);

Transaction transaction=session.beginTransaction();
session.update(userObj);
transaction.commit();

System.out.println("\n....... DATA UPDATED SUCCESSFULLY ..........");
session.close();
factory.close();
System.out.println("\n....... ENGINE STOP ..........");
}
}