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Here’s a full list of Object-Oriented Programming (OOP) concepts from basic to very advanced level:

🟢 Basic Level

  • Class

  • Object

  • Constructor

  • Destructor

  • Properties / Fields

  • Methods / Functions

  • Access Modifiers (Public, Private, Protected)

  • Encapsulation

  • Inheritance

  • Polymorphism (Overloading & Overriding)

  • Abstraction

🟡 Intermediate Level

  • Interfaces

  • Abstract Classes

  • Static Members

  • This Keyword

  • Super Keyword

  • Aggregation

  • Composition

  • Association

  • Method Hiding

  • Shallow Copy vs Deep Copy

  • Object Lifecycle

  • OOP Design Principles (e.g., DRY, KISS, YAGNI)

  • Object Initializers

🔴 Advanced Level

  • SOLID Principles

  • Dependency Injection

  • Design Patterns (Factory, Singleton, Strategy, Observer, etc.)

  • Reflection

  • Serialization / Deserialization

  • Annotations / Attributes

  • Mixins

  • Multiple Inheritance (via interfaces/traits)

  • Operator Overloading

  • Delegation

  • Dynamic Dispatch

  • Lazy Initialization

  • Fluent Interfaces

  • Method Chaining

  • Immutable Objects

  • Covariance and Contravariance

🟣 Very Advanced Level

  • Metaprogramming

  • Aspect-Oriented Programming (AOP)

  • Proxy Pattern / Dynamic Proxies

  • Duck Typing (in dynamic languages)

  • Object Graphs

  • Garbage Collection Tuning (OOP-related memory management)

  • Memory Leaks in OOP Context

  • Type Erasure (Java)

  • Advanced Reflection & Introspection

  • SOLID+GRASP Principles

  • Event-Driven OOP

  • Behavioral Subtyping

  • Type-safe Builders

  • Circular Dependency Resolution

  • Domain-Driven Design (DDD)

  • Object Pooling

  • Custom Serialization Logic

  • Advanced Dependency Injection Frameworks (Spring, Dagger, etc.)

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