I need help writing some code for the following problem:

Create a Patient Appointment System using Java. Must include following classes: Patient, Doctor, appointment

Essentially the patient makes an appointment online where they choose their doctor and time, but can include a loin page iif needed.Preferably if we could have a parent class, "User" and two child classes, "Doctor" and "patient".. just a thought.

MUST be designed in a user-friendly graphical interface in window environment