Object-Oriented Programming with Java Roadmap
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1 Java Fundamentals
Syntax, Variables, Data Types
Operators
Control Flow
Methods
Arrays
2 Introduction to OOP
What is an Object?
What is a Class?
The Four Pillars of OOP
3 Classes and Objects
Defining a Class
Creating Objects
The 'this' Keyword
Access Modifiers
Static Members
4 Encapsulation
Data Hiding
Getters and Setters
Benefits of Encapsulation
5 Inheritance
The 'extends' Keyword
The 'super' Keyword
Method Overriding
The Object Class
6 Polymorphism
Method Overloading
Method Overriding
Upcasting and Downcasting
7 Abstraction
Abstract Class
Interface
Difference between Abstract Class and Interface
8 Advanced OOP Concepts
Composition, Aggregation, Association
Coupling and Cohesion
The 'final' Keyword
Exception Handling
9 Java Collections & OOP
Understanding the Hierarchy
Polymorphism with Collections
Generics
10 SOLID Principles
SRP - Single Responsibility Principle
OCP - Open/Closed Principle
LSP - Liskov Substitution Principle
ISP - Interface Segregation Principle
DIP - Dependency Inversion Principle
11 Design Patterns
Introduction to Design Patterns
Creational Patterns (Singleton, Factory)
Structural Patterns (Adapter, Decorator)
Behavioral Patterns (Observer, Strategy)