code and setup

README.md

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+# 🧙‍♂️ Workshop: Hogwarts School System - A Magical OOP Adventure
+
+## Welcome, Young Wizard!
+
+> *"The sorting hat has placed you in Gryffindor... No, wait! It placed you in the **Java Development** house!"*
+
+Welcome to the **Hogwarts School System** workshop! This magical journey will help you master the fundamentals of **Object-Oriented Programming (OOP)** through a fun, wizard-themed project.
+
+---
+
+## 🎯 Workshop Objectives
+
+By completing this workshop, you will learn and practice:
+
+| Concept | How it's used in this project |
+|---------|-------------------------------|
+| **Encapsulation** | Private fields with public getters/setters |
+| **Inheritance** | `Student` and `Teacher` extend `User` |
+| **Polymorphism** | Different user types with same methods |
+| **Abstraction** | Abstract `User` class with common behavior |
+| **Lists & Collections** | Managing students, teachers, and courses with `ArrayList` |
+| **Input Validation** | Validating usernames and passwords |
+| **ID-based Selection** | Finding courses by unique ID instead of name |
+
+---
+
+## 🏰 Storyline
+
+*Professor Dumbledore has asked you to help modernize Hogwarts! The old parchment-based course enrollment system is a disaster. Students keep signing up for the wrong classes, and Professor Snape is furious because his Potions class is full of first-year students who can't tell a bezoar from a newt's eye.*
+
+*Your mission: Build a digital School Management System that allows:*
+
+- *Students to view available courses and enroll using magical Course IDs*
+- *Teachers to create new courses and manage their classes*
+- *Everyone to log in securely (even Filch needs to check who's where)*
+
+---
+
+## 📚 Class Hierarchy Diagram
+        ┌─────────────────┐
+        │ User            │
+        │ (Abstract)      │
+        └────────┬────────┘
+                 │
+  ┌──────────────┴──────────────┐
+  │                             │
+┌─────▼─────┐             ┌─────▼─────┐
+│ Student   │             │   Teacher │
+└─────┬─────┘             └─────┬─────┘
+      │                         │
+┌─────▼─────┐             ┌─────▼─────┐
+│enrolled   │             │ myCourses │
+│ Courses   │             │   (List)  │
+└───────────┘             └───────────┘
+
+┌─────────────────┐
+│ Course          │
+├─────────────────┤
+│ - id (static)   │
+│ - name          │
+│ - teacher       │     
+│ - students      │
+└─────────────────┘
+       │
+       │ contains
+       ▼
+┌─────────────────┐
+│ SchoolSystem    │
+│ (Service)       │
+└─────────────────┘
+   
+---
+
+
+
+
+
+---
+
+## 📋 Complete TODO List
+
+### 🔧 Student.java (3 TODOs)
+
+| # | Method | Description |
+|---|--------|-------------|
+| 1 | `enrollInCourse(Course course)` | Register student in a course |
+| 2 | `showMyCourses()` | Display all enrolled courses |
+| 3 | `getEnrolledCourses()` | Return list of enrolled courses |
+
+### 🔧 SchoolSystem.java (5 TODOs)
+
+| # | Method | Description |
+|---|--------|-------------|
+| 4 | `registerStudent(String username, String password)` | Register new student |
+| 5 | `loginStudent(String username, String password)` | Student login |
+| 6 | `findStudent(String username)` | Find student by username (private) |
+| 7 | `addCourseToSystem(String courseName)` | Add new course to system |
+| 8 | `findCourseById(int id)` | Find course by ID |
+
+### 🔧 Main.java (4 TODOs)
+
+| # | Location | Description |
+|---|----------|-------------|
+| 9 | `registerMenu()` - case 1 | Student registration |
+| 10 | `loginMenu()` - case 1 | Student login |
+| 11 | `studentMenu()` - case 3 | Show my courses |
+| 12 | `enrollInCourse(Student student)` | Enroll logic |
+
+### 📊 Summary
+
+| File | TODO Count |
+|------|------------|
+| Student.java | 3 |
+| SchoolSystem.java | 5 |
+| Main.java | 4 |
+| **Total** | **12** |
+
+---
+
+## ℹ️ Note
+
+> This exercise is for practice only and has no bouns.  
+> Students can complete it in class with TA assistance.
+
+**Good luck, young wizard!** ✨