Java OOP Practice Projects

This repository contains a collection of Java practice projects that demonstrate various core concepts of Object-Oriented Programming (OOP).
Each project was created during my academic learning using the NetBeans IDE, applying OOP theory in hands-on coding.

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🔖 Table of Contents

1. Even or Odd Checker – Simple conditionals with encapsulated logic
2. Student Scores Analyzer – Array processing with statistics
3. Array Methods Demo – Returning and passing arrays
4. Quadratic & Rectangle – Constructors, methods, and modular classes
5. Inheritance with Cylinder & Circle – Inheritance, overriding, and volume calculations
6. Shapes with Inheritance & Interfaces – Full OOP structure using interfaces and hierarchies
7. Bank Account & Person Validation – User input + validation logic + account handling
8. Exception Handling Demo – Custom exception throws and try-catch-finally

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🧠 Key OOP Concepts Used

• Encapsulation (private fields, getters/setters)
• Inheritance (classes like cylinder extends circle1)
• Polymorphism (interfaces: shape2, overridden methods)
• Abstraction (using interfaces and class structures)
• Constructor Overloading & Method Overriding
• Exception Handling (try-catch-finally, custom errors)

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🗂️ Project Highlights

1. Even or Odd Checker

• Input from user → determines even or odd
• Simple method call + scanner
• Project folder: even-odd-checker-java

2. Student Scores Analyzer

• Reads 10 scores, calculates max, min, and average
• Uses int[] array and basic loop logic
• Project folder: student-scores-analyzer

3. Array Methods Demo

• Demonstrates passing and returning arrays
• Uses int[] and double[] arrays
• Project folder: array-methods-demo

4. Quadratic & Rectangle

• Class qudratic calculates roots
• Class rectangle with area and perimeter
• Project folder: oop-quadratic-and-rectangle-demo

5. Inheritance: Cylinder & Circle

• Class cylinder inherits from circle1
• Method overriding and volume calculation
• Project folder: inheritance-cylinder-circle-demo

6. Shapes – Inheritance & Interfaces

• Uses interface shape2
• Classes like rectangle, square, circle use inheritance and override
• Project folder: oop-shapes-inheritance-interface

7. Bank Account & Person Validation

• Class bankacount for deposit/withdraw
• Class person for validating phone/email/age/name
• Class BirthDate for date verification
• Project folder: bank-account-and-person-data-validation

8. Exception Handling Demo

• Method getAverage() throws exceptions for invalid inputs
• Try-catch blocks for built-in Java exceptions
• Project folder: java-exception-handling-demo

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🛠️ Tech Stack

• Java SE
• NetBeans IDE
• Console I/O
• OOP Principles

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Created with passion and persistence during my journey of mastering OOP in Java 💻✨