Master Software Design Patterns: Complete Course Outline (.NET & Java)

🏗️ Software Design Patterns Course Outline (.NET & Java, Beginner to Advanced, Latest Features 2025)

📌 Introduction

Software Design Patterns provide proven solutions to recurring problems in software development. Mastering design patterns helps developers build robust, maintainable, and scalable applications across platforms. This course covers creational, structural, behavioral, and modern design patterns in .NET and Java, including latest language features, functional patterns, and real-world applications for 2025.

📘 Detailed Course Outline

Module 1: Introduction to Design Patterns

What are design patterns and their importance
History and evolution (Gang of Four, GoF)
Categories of design patterns: Creational, Structural, Behavioral
Benefits: reusability, scalability, maintainability
Principles behind patterns: SOLID, DRY, KISS, YAGNI

Module 2: Core Principles of Object-Oriented Design

Abstraction, encapsulation, inheritance, polymorphism
Interfaces and abstract classes
Coupling and cohesion
Dependency inversion and inversion of control (IoC)
Composition over inheritance
Introduction to modern OOP features in .NET 7+ and Java 21+

Module 3: Creational Design Patterns

Singleton (classic and modern thread-safe implementations)
Factory Method
Abstract Factory
Builder Pattern
Prototype Pattern
Lazy Initialization and Dependency Injection patterns

Module 4: Structural Design Patterns

Adapter / Wrapper Pattern
Bridge Pattern
Composite Pattern
Decorator Pattern
Facade Pattern
Flyweight Pattern
Proxy Pattern (Static, Dynamic, and Virtual Proxy)

Module 5: Behavioral Design Patterns

Strategy Pattern
Observer / Publisher-Subscriber Pattern
Command Pattern
Iterator Pattern
Mediator Pattern
Memento Pattern
State Pattern
Template Method Pattern
Visitor Pattern
Chain of Responsibility Pattern

Module 6: Concurrency & Multithreading Patterns

Thread-Safe Singleton
Producer-Consumer Pattern
Reactor Pattern
Scheduler / Task Queue patterns
Futures and Promises usage patterns (.NET Task, Java CompletableFuture)

Module 7: Functional & Reactive Patterns

Functional interfaces and lambda patterns
Event-driven architecture patterns
Reactive Streams (RxJava, Rx.NET)
Observer and Publisher-Subscriber in reactive programming
Modern patterns using Java 21 Flow API and .NET System.Reactive

Module 8: Architectural & Enterprise Patterns

MVC, MVP, MVVM patterns
Layered / N-tier architecture patterns
Microservices design patterns (API Gateway, CQRS, Event Sourcing)
Repository and Unit of Work patterns
Dependency Injection and IoC containers (.NET Core DI, Spring)
Service Locator pattern

Module 9: Best Practices & Anti-Patterns

Common anti-patterns to avoid
Choosing the right pattern for the right scenario
Refactoring legacy code using patterns
Combining patterns for real-world solutions
Versioning and maintaining design patterns in modern apps

Module 10: Advanced & Modern Design Patterns

Modern .NET and Java features in patterns (records, sealed classes, pattern matching)
Async / Await and reactive design patterns
Cloud-native patterns (circuit breaker, bulkhead, retry)
Event-driven and streaming design patterns
Integration with CI/CD pipelines and DevOps considerations

📌 Conclusion

Mastering Software Design Patterns empowers developers to build scalable, maintainable, and high-performance applications in both .NET and Java. This roadmap covers classic, advanced, and modern patterns, emphasizing real-world applications, concurrency, reactive programming, and cloud-native best practices for 2025-ready software solutions.