Composite Design Pattern | Build File System (UML & Code) | System Design

Welcome to Lecture 19 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 step-by-step tutorial, you’ll learn how to implement the *Composite Design Pattern* by constructing a simple file system example. We’ll begin with a UML class diagram to illustrate the relationships between *File, **Folder, and the common **Component* interface. Then, we’ll translate that design into working code (Java) to show how files and folders can be treated uniformly by client code.

*What you’ll learn in this video:*

- Overview of the Composite Design Pattern and when to use it
- UML class diagram walkthrough of a file system structure (File, Folder, Component)
- Detailed code example demonstrating how to build File and Folder classes that share a common interface
- How to recursively list, open, and calculate sizes of nested folders and files
- Best practices for using Composite in real-world applications

Whether you are a beginner in *design patterns* or looking to solidify your understanding of *structural patterns*, this example will help you master the core concepts.
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00:00 Introduction
01:14 Similarity with Tree DS
01:55 Designing File System
03:58 Situation without Composite Pattern
10:59 What is Composite Pattern all about
12:12 UML for File System
22:20 Standard UML
23:40 Code for file System
35:12 Standard Definition
36:17 Real World Problem
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Видео Composite Design Pattern | Build File System (UML & Code) | System Design канала Coder Army