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Design Patterns - Low Level Design

Course Contents

What Are Design Patterns? — History & Classification

Singleton Pattern

Factory Method Pattern

Abstract Factory Pattern

Builder Pattern

Prototype Pattern

Adapter Pattern — Making Incompatible Interfaces Work

Facade Pattern — Simplifying Complex Subsystems

Decorator Pattern — Adding Behavior Dynamically

Composite Pattern — Tree Structures

Proxy Pattern — Controlling Access

Bridge Pattern — Separating Abstraction from Implementation

Flyweight Pattern — Sharing Common State

When to Use Which Structural Pattern — Decision Guide

Strategy Pattern — Swappable Algorithms

Observer Pattern — Event-Driven Communication

Command Pattern — Encapsulating Actions

State Pattern — Objects that Change Behavior

Template Method Pattern — Algorithm Skeleton

Iterator Pattern — Traversing Collections

Chain of Responsibility — Passing the Request

Mediator Pattern — Centralizing Communication

Memento Pattern — Undo/Snapshot

Visitor Pattern — Adding Operations Without Changing Classes

Null Object Pattern — Eliminating Null Checks

When to Use Which Behavioral Pattern — Decision Guide

When to Use Which Creational Pattern — Decision Tree

When to Use Which Structural Pattern — Decision Tree

When to Use Which Behavioral Pattern — Decision Tree

Complete Design Patterns Quick Reference

When to Use Which Behavioral Pattern — Decision Guide

A comprehensive decision framework for choosing the right behavioral design pattern — compare all 11 patterns by problem type, structure, and real-world applicability.

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