🏥 Hospital Management System

A Java console application that models hospital personnel and demonstrates foundational OOP concepts:
Encapsulation, Inheritance, Method Overriding, Upcasting, and Downcasting.

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🎯 Objective

Build a straightforward Hospital Management System in Java where different roles share common structure but expose role-specific behavior, illustrating how object-oriented design maps to real-world entities.

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✅ Requirements

1. 🔒 Encapsulation

• Base class Person with private fields:
  • name (String)
  • age (int)
  • gender (String)
• Accessible through public getters and setters.

2. 🧬 Inheritance

• Four subclasses extending Person:
  • Doctor → adds specialization (String)
  • Nurse → adds qualification (String)
  • Patient → adds disease (String)
  • Receptionist → adds shift (String)

3. 🔁 Method Overriding

• Each subclass overrides a details() method to print its own information.

4. 🔼🔽 Upcasting & Downcasting

• Upcasting: Treat Doctor, Nurse, Patient, and Receptionist as Person references to demonstrate polymorphism.
• Downcasting: Safely revert to subclasses (with instanceof checks) to access their specific fields.

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📁 Project Structure

├── src/
│ └── Hms/
│ ├── Person.java
│ ├── Doctor.java
│ ├── Nurse.java
│ ├── Patient.java
│ ├── Receptionist.java
│ ├── Main.java # entry point
│ └── module-info.java
├── .classpath
├── .project
├── .gitignore
└── README.md

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💻 Sample Output

name: Dr. Alekhya, age: 33, gender: Female
Doctor Specialization :Neuro
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name: Ravi, age: 60, gender: Male
Patient disease :Braintumor
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name: Mamatha, age: 32, gender: Female
Reciptionist Shift :night
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name: Ramu, age: 29, gender: Male
Nurse Qualification :nursing
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🛠️ Technologies Used

• Java (OOP Concepts)
• Eclipse IDE (or any preferred Java IDE)

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