System Design Full Course - Template Method Pattern | Step-by-Step Example (UML + Code)

Welcome to Lecture 20 of the Ultimate Low-Level Design (LLD) Series by Coder Army! fourth week for #lowleveldesign #systemdesign #8weeksLLdchallenge. We are doing 8 weeks challenge and going to complete the whole course within the duration with quality content on Youtube. Let’s learn LLD like never before and attain advance level mastery on this subject. In this video, we dive deep into the *Template Method Design Pattern*, one of the key behavioral patterns in software engineering. You’ll learn how to define a skeleton of an algorithm in a base class and let subclasses override specific steps—without changing the overall workflow. We’ll explore the pattern’s structure, benefits, and a concrete example that demonstrates model training pipelines for different algorithms (Neural Network vs. Decision Tree). *What you’ll learn:* - What the Template Method Pattern is and when to use it - UML class diagram illustrating abstract base class and concrete subclasses - How to implement the pattern in code (C++/Java syntax) - How subclasses override specific “hook” methods while preserving the main algorithm - Real-world example: reusable training pipeline for machine learning models Whether you’re preparing for a coding interview, designing scalable architectures, or just want to solidify your understanding of behavioral patterns, this tutorial has you covered! Join Coder Army Whatsapp Group: https://whatsapp.com/channel/0029Va6H0tbHVvTbcuT99Y1f Code and Notes: Github : https://github.com/adityatandon15/LLD Connect with Aditya Tandon Instagram : https://www.instagram.com/adityatandon2 LinkedIn : https://www.linkedin.com/in/adityatandon2 Twitter : https://x.com/adityatandon02 00:00 Introduction 01:13 Template Design Pattern 03:53 UML for Model Training Example 11:19 Standard UML Diagram 12:24 Code for Model Training Example 16:36 Standard Definition 17:33 Real life use cases #SystemDesign #LowLevelDesign #LLD #AdapterPattern #DesignPatterns #Cplusplus #JavaDevelopers #UMLDiagrams #TechInterviews #SoftwareEngineering #XMLtoJSON #CleanCode #SoftwareArchitecture #ObjectOrientedDesign #CodingWithExamples #CodeBetter #8WeeksLLDChallenge #JSON