SOLID Principles Full Course in Java | SRP, OCP, LSP, ISP, DIP Explained

In this video, you'll learn what is solid principles and why they are essential design principles for writing clean, scalable software. Whether you're preparing for interviews or building real-world applications, understanding SOLID Principles is non-negotiable — and this video covers them with real coding problems and their solutions. We walk through all five solid principles in java with hands-on demonstrations — starting from the problem you face in everyday coding, then showing exactly how each principle solves it: 🔹 Single Responsibility Principle (SRP) Learn how the single responsibility principle java keeps your classes focused on one thing. We demonstrate srp solid with a real coding problem — a class doing too much — and refactor it the right way. 🔹 Open/Closed Principle Discover how the open closed principle lets you extend functionality without modifying existing code. We show the open closed approach in action — where changing requirements break your code, and how Open/Closed Principle saves you from it. 🔹 Liskov Substitution Principle Ever overridden a method and watched your app break at runtime? That's an LSP violation. The Liskov Substitution Principle is explained here with practical Java examples — what goes wrong when subclass behavior doesn't match the parent's contract, and how to fix it so your inheritance hierarchies actually work. 🔹 Interface Segregation Principle See how interface segregation principle java prevents bloated, force-fit interfaces. We walk through the liskov substitution principle and interface segregation principle side by side — because this is where most developers get confused. 🔹 Dependency Inversion Principle Master the dependency inversion principle to decouple high-level logic from low-level details. The dependency inversion concept ties everything together and shows why solid java architecture depends on abstractions, not concretions. ⚡ LSP vs ISP — A Dedicated Section One of the most confusing topics in solid principles examples is the difference between the Liskov Substitution Principle and the Interface Segregation Principle — both seem similar on the surface, but they solve fundamentally different problems. This video includes a dedicated section where I clarify the key differences between LSP and ISP with concrete examples, so you never mix them up in an interview or in production code. 🎯 Why Watch This? 1. Real coding problems → SOLID solutions — not just theory 2. Covers java solid principles with practical implementations you can apply today 3. Solid principles interview questions java prep is built into every section 4. Perfect for system design playlist preparation — SOLID is foundational system design knowledge 5. Also known as principios solid globally — these solid principles java concepts transcend language barriers and apply to any OOP language Whether you're reviewing solid design principles for a product-based company interview or learning the solid principles for the first time, this video gives you everything you need — from the single responsibility principle to the dependency inversion principle, with real coding problems solved step by step 00:00 : Introduction 01:42 : Single Responsibility Principle 07:56 : Open/Closed Principle 13:40 : Liskov Substitution Principle 24:18 : Interface Segregation Principle 29:11 : LSP vs ISP 35:18 : Dependency Inversion Principle Instagram : https://www.instagram.com/the.curious_coder #SOLIDPrinciples #Java #DesignPrinciples #SystemDesign #InterviewPrep #CleanCode #LiskovSubstitution #InterfaceSegregation #DependencyInversion #SingleResponsibility #OpenClosedPrinciple