Hospital Management System (Java OOP)

This is an object-oriented model of a hospital's patients, doctors, departments and billable services. It demonstrates inheritance, abstraction, interfaces, polymorphism and Comparable-based sorting.

classDiagram
    class Billable { <<interface>> +calculateBill() double }
    class PatientBase { +calculateBill() +compareTo() }
    class EmergencyPatient { -emergencyFee }
    class LongTermPatient { -daysAdmitted -dailyRate }
    class Doctor { +calculateSalary() +compareTo() }
    class Department
    class HospitalService { -cost }
    Billable <|.. PatientBase
    PatientBase <|-- EmergencyPatient
    PatientBase <|-- LongTermPatient
    PatientBase --> Department
    PatientBase --> "*" HospitalService
    Doctor --> Department

Loading

• Polymorphic billing: each patient type overrides calculateBill(). Emergency patients pay a flat fee plus services, and long-term patients pay days × daily rate plus services, with tax applied in both cases.
• Sorting: doctors sort by computed salary (base × degree multiplier + overtime pay), and patients sort by bill amount. Both use Comparable and List.sort(null).
• Driver builds a sample hospital, prints an itemised bill and the two sorted lists, and totals every bill.

Run

javac -d out JavaProject_1231870_11/*.java
java -cp out Project.Driver

Patient Number (1287) Bill:
Patient's Name: Saleem
Total Bill Amount: 14100.0$

List of Doctors Sorted Ascendingly Based on thier Salaries:
Farouq       | Neurology      | 2050.00
Omar         | Cardiology     | 2785.00
...
Total Bills: 14910.84

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Object-Oriented Programming (COMP2310), Birzeit University, Fall 2024.