Can you write a working java code according to the functional requirements below? The system should allow users to register to the system with name, surname, phone number and T$.$C number.

Apr $5$

Patients can make an appointment and change the appointment.

$(1)$ Apr $5$

The system should display the user's appointments, medical history, and prescriptions.

$(1)$ Apr $5$

The system should enable the doctor to cancel the appointment.

$(1)$ Apr $5$