Java OOP Fundamentals: Classes and Objects

☕ Learn Java with Me — Day 13 Since we already covered Inheritance, today we moved ahead with two more important OOP concepts 💻 👉 Encapsulation Wrapping data and methods together inside a class. It helps in: → data security → better structure → controlled access Example: class Student { private String name; ``` public void setName(String n) { name = n; } ``` } 👉 Polymorphism One method, multiple forms. This means the same method name can behave differently depending on the input. This is where Java starts feeling smarter. Step by step, OOP is becoming clearer 🚀 We’re learning together 🤝 #java #oop #coding #encapsulation #polymorphism #learning #showup

🚀 Sharing My OOP Notes in Java! I first learned Object-Oriented Programming (OOP) back in 2023, and recently I organized my notes into a clean and structured format to help others who are learning. These notes cover key concepts like: 🔹 Object & Class (basic building blocks of OOP) 🔹 Encapsulation (getters, setters, constructors) 🔹 Inheritance (code reusability and hierarchy) 🔹 Polymorphism (method overloading & overriding) 🔹 Abstraction (abstract classes) 🔹 Interface (designing flexible and scalable systems) The goal is simple to make OOP easier to understand with clear explanations and practical examples. 📩 If anyone needs access to my Notion notes, feel free to send me a message—I’ll be happy to share! Let’s help each other grow 💡 #Java #OOP #Programming #Learning

🚀 Starting My Java Learning Journey – Day 15 🔹 Topic: Introduction to OOP Concepts in Java OOP (Object-Oriented Programming) is a programming paradigm based on objects and classes. It helps in writing programs that are modular, reusable, and easy to maintain. ✅What is a Class? A class is a blueprint or template used to create objects ✅What is an Object? An object is an instance of a class. Example class Student { String name; int age; } public class Main { public static void main(String[] args) { Student s1 = new Student(); s1.name = "John"; s1.age = 24; System.out.println(s1.name + " " + s1.age); } } 🔷 Main OOP Concepts ✔ Encapsulation ✔ Inheritance ✔ Polymorphism ✔ Abstraction 💡 Key Points: ✔ OOP organizes code using classes and objects ✔ Makes programs scalable and reusable ✔ Widely used in real-world applications #Java #JavaLearning #Programming #BackendDevelopment #CodingJourney #OOP #JavaOOP

🚀 New Java OOP Videos Released! – Compile-Time Polymorphism Series Excited to share the next set of sessions in our Java OOP Programming journey 👇 📌 New Sessions: • Session 56 – Types of Polymorphism in Java • Session 57 – Compile-Time Polymorphism Introduction • Session 58 – Method Overloading Rules (Part 1) • Session 59 – Method Overloading Rules (Part 2) • Session 60 – Method Overloading Rules (Part 3) • Session 61 – Why Compile-Time Polymorphism? 🎯 Focus: Strong fundamentals + real clarity on method overloading & design concepts 🔗 Playlist: https://shorturl.at/VEtae 💡 Learning by Doing with Praveen Kandhan 👍 Your continuous support means a lot 🙌 #Java #OOP #Polymorphism #Programming #LearningByDoing #Coding

☕ Learn Java with Me — Day 10 Today we stepped into one of the most important concepts in Java: 👉 Classes & Objects This is where Java starts feeling like real programming. A class is like a blueprint. An object is the real thing created from that blueprint. For example: class Student { String name; } Student s1 = new Student(); Simple. But very powerful. This is how real applications manage:→ students→ users→ products→accounts Everything in Java starts becoming structured from here. Today’s key learning:→ Class = design / structure→ Object = actual data This is the foundation of OOP. And honestly, it made Java feel much more practical today 💻 We’re learning together 🤝 #java #coding #oop #learning #showup

🚀 Day 16/45 – Understanding Abstraction in Java On Day 16 of my Java learning journey, I explored Abstraction, one of the core principles of Object-Oriented Programming. Abstraction focuses on hiding implementation details and showing only the essential functionality to the user. 📚 What I Learned Today Today I learned: ✔ What abstraction is and why it is important ✔ How to use abstract classes in Java ✔ Understanding abstract methods (methods without body) ✔ How abstraction works with inheritance 💻 Practice Work To apply my learning, I implemented: • An animal example using abstract class • A shape example demonstrating abstraction 🎯 Key Takeaway Abstraction helps simplify complex systems by hiding unnecessary details and focusing on what is important. It plays a key role in building clean and scalable applications. Step by step, I am gaining a deeper understanding of OOP concepts. #Java #Programming #LearningInPublic #CodingJourney #SoftwareDevelopment #OOP

🚀 Learning Progress: Java OOP – Encapsulation & POJO Continuing my journey in mastering Object-Oriented Programming in Java, I worked on a program to demonstrate Encapsulation along with the use of a POJO (Plain Old Java Object) class. In this program: I created a POJO class with private variables to represent the data Used getter and setter methods to control access and modification of that data Ensured proper data hiding, which is the core idea of Encapsulation This hands-on implementation helped me understand how POJO classes are used in real-world applications to create clean, reusable, and maintainable code structures while keeping data secure. It was a great exercise in writing structured and professional Java code, and I’m excited to explore more OOP concepts and apply them in practical scenarios. #Java #OOP #Encapsulation #POJO #LearningJourney #SoftwareDevelopment#Tap Academy

Abstraction in Java The last OOP concept — Abstraction - using abstract classes. Here’s what I learned: 🔹 Abstract Methods These methods contain only the method signature (no body) and must be implemented by the child class. 🔹 Abstract Class Rules ✔ If a class contains abstract methods, it must be declared as abstract ✔ If a class extends an abstract class, it must either: • Implement all abstract methods, or • Be declared as abstract 🔹 Key Characteristics ✔ Abstract classes cannot be instantiated (no object creation) ✔ They can contain both abstract and non-abstract methods ✔ They behave like normal classes except for object creation 🔹 Constructor Behavior Even though we cannot create objects of an abstract class, its constructor is still executed when a child class object is created (via super()). This helped me clearly understand how abstraction provides structure and enforces implementation, making code more organized and scalable. TAP Academy #Java #OOP #Abstraction #Programming #SoftwareDevelopment #LearningJourney

🚀 Day 15/45 – Understanding Polymorphism in Java On Day 15 of my Java learning journey, I explored Polymorphism, one of the key pillars of Object-Oriented Programming. Polymorphism allows the same method to behave differently based on the context, making code more flexible and reusable. 📚 What I Learned Today Today I learned: ✔ What polymorphism is and why it is important ✔ Method overloading (compile-time polymorphism) ✔ Method overriding (runtime polymorphism) ✔ Difference between overloading and overriding 💻 Practice Work To apply my learning, I implemented: • A method overloading example using different parameters • A method overriding example using inheritance 🎯 Key Takeaway Polymorphism improves code flexibility and helps in designing scalable applications. It allows developers to use a single interface with multiple implementations. Understanding these OOP concepts step by step is strengthening my programming foundation. #Java #Programming #LearningInPublic #CodingJourney #SoftwareDevelopment #OOP

🚀 OOP Learning Journey (Day 27 to Day 31) – Java I have completed and revised Object-Oriented Programming concepts in Java over the last few days. Here is a summary of my learning journey 👇 📚 Topics Covered: • Class & Object • Constructors (Default & Parameterized) • this Keyword • Encapsulation (Getters & Setters) • Static Keyword • Inheritance (extends) • Method Overriding • Polymorphism (Compile-time & Runtime) • Abstraction (Abstract Class) • Interfaces in Java • Basic Exception Handling Note :- In last of notes i also add mind map ,an all in one oops concept code and Frequently asked questions 💡 Key Learning: OOP is not just about writing code — it is about thinking in real-world objects and structuring programs efficiently. 🔥 What I gained: • Strong understanding of Java OOP fundamentals • Better problem-solving approach • Confidence in writing OOP-based programs Next step: Practicing more coding problems and building small projects 💻 #Java #OOP #LearningInPublic #100DaysOfCode #Programming #CSE #Consistency