Question

I have this classes

interface UserInterface

Then

abstract class user implements UserInterface

Then i have two child classes

Class Teacher extends User

Class Parent extends User

Now in the dtabase i have three tables

1. user table with id,password
2. teacher with FK and other stuff
3. parent with FK and other stuff

Now i am checking the login using User class.

My problem is that if Employee logins then the object in memory will be of User type. How can then i get the Employee object

Is my model wrong and i need to do different way?

Answer 1

Assuming Employee is a third subclass of User, then if a user logs in, and you get this user from the database using Hibernate, and this user is in fact an employee, then Hibernate will return an Employee instance. It works as you would expect.

If it doesn’t, then you did something wrong, but it’s impossible to tell without seeing the code.