Java Design Patterns | Complete One Shot Tutorial

Master all 11 most important Design Patterns in Java in one complete, hands-on course and crack your next Java Backend Developer, Low-Level Design (LLD), and System Design interview.

This course follows the approach used by experienced software engineers. We first build the wrong implementation, understand why it fails, identify every design flaw, and then refactor the code step by step until we arrive at the actual Design Pattern implementation. By understanding the problem before the solution, you'll know when to use a design pattern, not just how to code it.

Every design pattern is implemented completely in Java inside IntelliJ IDEA using real-world scenarios that you'll encounter in production applications and backend developer interviews.

🚀 Design Patterns Covered :

1. Creational Design Patterns

✅ Factory Design Pattern
✅ Abstract Factory Design Pattern
✅ Builder Design Pattern
✅ Singleton Design Pattern
✅ Prototype Design Pattern

2. Structural Design Patterns

✅ Adapter Design Pattern
✅ Decorator Design Pattern
✅ Proxy Design Pattern

3. Behavioral Design Patterns

✅ Observer Design Pattern
✅ Strategy Design Pattern
✅ Chain of Responsibility Design Pattern

📚 What You'll Learn

• Design Patterns explained from scratch with complete Java implementations
• Real-world scenarios where each design pattern should be used
• Step-by-step refactoring from tightly coupled code to scalable architecture
• Low-Level Design (LLD) concepts used in production systems
• SOLID Principles applied while implementing Design Patterns
• Writing clean, maintainable, extensible, and production-ready Java code

Whether you're preparing for Java Developer Interviews, Backend Engineer Interviews, System Design Interviews, or simply want to become a better software engineer, this course will give you a solid understanding of the most frequently asked Design Patterns in the industry.

📂 GitHub Repository (Code for Every Design Pattern)

Each Design Pattern has its own dedicated Git branch so you can easily follow along with the implementation shown in the video.

1. Factory Pattern → https://github.com/TheCuriousCoder-sg/design-patterns/tree/factory-pattern
2. Abstract Factory → https://github.com/TheCuriousCoder-sg/design-patterns/tree/abstract-factory-pattern
3. Builder Pattern → https://github.com/TheCuriousCoder-sg/design-patterns/tree/builder-pattern
4. Singleton Pattern → https://github.com/TheCuriousCoder-sg/design-patterns/tree/singleton-pattern
5. Prototype Pattern → https://github.com/TheCuriousCoder-sg/design-patterns/tree/prototype-pattern
6. Adapter Pattern → https://github.com/TheCuriousCoder-sg/design-patterns/tree/adapter-pattern
7. Decorator Pattern → https://github.com/TheCuriousCoder-sg/design-patterns/tree/decorator-pattern
8. Proxy Pattern → https://github.com/TheCuriousCoder-sg/design-patterns/tree/proxy-pattern
9. Observer Pattern → https://github.com/TheCuriousCoder-sg/design-patterns/tree/observer-pattern
10. Strategy Pattern → https://github.com/TheCuriousCoder-sg/design-patterns/tree/strategy-pattern
11. Chain of Responsibility → https://github.com/TheCuriousCoder-sg/design-patterns/tree/chain-of-responsibility

00:00:00 : Introduction
00:00:57 : Factory Design Pattern
00:15:09 : Abstract Factory Design Pattern
00:25:02 : Builder Design Pattern
00:50:35 : Singleton Design Pattern
01:10:59 : Prototype Design Pattern
01:32:07 : Adapter Design Pattern
01:50:43 : Decorator Design Pattern
02:16:58 : Proxy Design Pattern
02:37:51 : Observer Design Pattern
02:54:50 : Strategy Design Pattern
03:06:24 : Chain Of Responsibility Design Pattern

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