---

🧩 Object Oriented Programming I (Java)

This repository contains my coursework, practice codes, and lab implementations for Object Oriented Concepts I (OOP-I) using Java, following the official syllabus of the Software Engineering program.

The goal of this repository is to master core object-oriented principles and apply them through clean, reusable, and maintainable Java code.

---

🎯 Core OOP Pillars

This course is centered around the four fundamental pillars of Object-Oriented Programming:

• 🔒 Encapsulation – Data hiding through access modifiers, interfaces, and controlled access
• 🧠 Abstraction – Abstract classes, interfaces, and minimal public interfaces
• 🔁 Polymorphism – Method overloading, method overriding, dynamic binding
• 🧬 Inheritance – Superclasses, subclasses, generalization, and specialization

Each concept is implemented with practical Java examples.

---

📘 Course Overview

Course Title: Object Oriented Concepts I Credits: 2 Credit Theory + 1 Credit Lab

🔹 Topics Covered

🟢 Object Oriented Fundamentals

• Procedural vs Object Oriented Programming
• Objects: Data & Behavior
• Classes: Attributes, Methods, Messages
• UML Class Diagrams
• Interface vs Implementation
• Is-a and Has-a Relationships

🟢 Class Design & Constructors

• Default and Parameterized Constructors
• Multiple Constructors
• Constructor Design Principles
• Scope and Error Handling
• Anatomy of a Class
• Public Interfaces vs Private Implementations

🟢 Advanced OOP Concepts

• Composition and Object Collaboration
• Reuse, Extensibility, and Maintainability
• Modeling Real-World Systems
• Class Responsibility and Collaboration
• Frameworks, Abstract Classes, and Interfaces
• How Inheritance Weakens Encapsulation

---

☕ Java Programming Essentials

🔹 Java Basics

• JVM, JRE, JDK
• Java Installation and IDE Setup
• Hello World Program
• Compilation and Execution
• Java Classpath & JVM Architecture

🔹 Java Syntax & Features

• Packages and Imports
• Fields, Methods, and Constructors
• Primitive Data Types
• Strings and Wrapper Classes
• null and Nonexistence Types

---

🧪 Practical Java Implementations

🔹 String Handling

• String Creation & Operations
• Immutability of String
• Comparison and Searching
• StringBuffer & StringBuilder

🔹 Exception Handling

• try / catch
• Checked vs Unchecked Exceptions
• throw and throws
• Common Exceptions
• User-Defined Exceptions

🔹 Java I/O

• Streams (Input & Output)
• Files and Directories
• Path and Directory Tree

🔹 Logging & Debugging

• Java Logger
• Log Levels
• Formatters & Filters
• Debugging Workflow

---

📂 Repository Structure (Example)

oop-i-java/
│── basics/
│── encapsulation/
│── inheritance/
│── polymorphism/
│── abstraction/
│── constructors/
│── exception-handling/
│── string-handling/
│── io-streams/
│── logging-debugging/

---

🎯 Learning Outcome

By completing this course and repository, I aim to:

• Think in objects, not procedures
• Design robust and reusable classes
• Apply OOP principles in real-world software systems
• Build a strong foundation for advanced software engineering courses

---

📚 References

1. The Object Oriented Thought Process — Matt Weisfeld
2. Java How to Program — Paul Deitel & Harvey Deitel
3. Java: The Complete Reference — Herbert Schildt

---

👤 Author

A.S.M. Morshed Software Engineering Student Aspiring Software Engineer & Academic Enthusiast

---