What is UML Diagrams | Class & Sequence Diagrams with Real Examples
Welcome to Lecture 4 of the Ultimate Low-Level Design (LLD) Series by Coder Army!
Today is Day 4 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 lecture, we break down one of the most powerful concepts in Object-Oriented Programming — Inheritance and Polymorphism — with clear real-world analogies and practical code demonstrations.
In this session, we explore one of the most essential tools for software engineers and system designers — *UML Diagrams (Unified Modeling Language)*.
📌 In this video, you’ll learn:
What is UML and why it’s used in software design
How to draw and understand Class Diagrams (with real-world examples)
How to create and analyze Sequence Diagrams to visualize system interactions
How UML helps in real-life Low-Level Design and interview discussions
Whether you’re preparing for tech interviews, working on software architecture, or building your own projects — understanding UML is a must for clear, maintainable, and scalable code design.
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Code and Notes: Github : https://github.com/adityatandon15/LLD
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Timestamps:
00:00 Introduction to UML Diagrams
02:14 Types of UML
05:46 Class Diagrams
06:42 Representing class structure in UML
17:30 Representing class Association in UML
22:03 Representing Inheritance in UML
25:40 Composition Explained
27:10 Representing Simple Association
30:12 Representing Aggregation
34:34 Representing Composition
43:34 Exercise Problem
44:48 Conclusion for Class Diagrams
46:43 Sequence Diagram
01:00:37 How to draw Sequence Diagrams
#uml #LowLevelDesign #Abstraction #Encapsulation #LLD #SystemDesign #SoftwareEngineering #TechInterviews #CoderArmy #CodingConcepts
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