📚 School Management System (Java OOP Practice)

A simple Java console-based application designed to practice and demonstrate core Object-Oriented Programming (OOP) concepts including Inheritance, Interfaces, Polymorphism, Aggregation, and more.

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📌 Features

✅ Manage Students, Teachers, Admin staff, and Courses
✅ Compute salaries dynamically for Teachers (based on handled courses) and Admins (with fixed allowances)
✅ Aggregate shared Course objects between Students and Teachers
✅ Demonstrates runtime polymorphism via a Payable interface
✅ Clean, organized OOP structure and class relationships

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📖 Concepts Practiced

• ✅ Object-Oriented Programming (OOP)
• ✅ Constructors
• ✅ Array of Objects (ArrayList)
• ✅ Static variables and methods
• ✅ Inheritance
• ✅ super keyword for constructor chaining
• ✅ Method Overriding
• ✅ Abstraction via interfaces
• ✅ Interfaces (Payable)
• ✅ Polymorphism (including runtime polymorphism)
• ✅ Getters and Setters
• ✅ Aggregation (shared Course objects)

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💻 How to Run

1. Clone the repository

   git clone https://github.com/geloy-n/School-Management-System-OOP-Java.git
   cd School-Management-System-OOP-Java/src
   

2. Compile the project

   javac models/*.java Main.java
   

3. Run the program

   java Main
   

📌 Sample Output

Student ID: 1, Name: John, Age: 20
Student ID: 2, Name: Mark, Age: 21
Teacher ID: 1, Name: Matthew, Age: 30, Base Salary: 40000.0, Total Salary: 44000.0

Total Number of Students: 2
Total Number of Teachers: 1

Courses handled by Matthew:
- Mathematics 101 (MATH101) 
- Science 101 (SCI101) 
Courses enrolled by John:
- Mathematics 101 (MATH101)
Courses enrolled by Mark:
- Science 101 (SCI101)

Teacher ID: 1, Name: Matthew, Age: 30, Base Salary: 40000.0, Total Salary: 44000.0
Admin Name: Luke, Base Salary: 50000.0, Allowance: 8000.0, Total Salary: 58000.0

Updating base salary for Matthew from 40000.0 to 45000.0

Teacher ID: 1, Name: Matthew, Age: 30, Base Salary: 45000.0, Total Salary: 47000.0
Courses handled by Matthew:
- Mathematics 101 (MATH101)