Low Level Design: OPP, SOLID Principles and Design Patterns

Learn Low-Level Design (LLD) with Java – From Fundamentals to Implementation

Want to write clean, maintainable, and well-structured Java applications?

Understanding Java syntax is just the beginning. As a software developer, you also need to understand how to design software components, organize classes, define relationships, and build applications that are easy to maintain and extend.

In this beginner-friendly course, you will learn the fundamentals of Low-Level Design (LLD) using Java. We will start with essential Object-Oriented Programming concepts, gradually explore SOLID principles and commonly used design patterns, and finally apply everything in a practical Taxi Booking System project.

The course focuses on explaining concepts clearly with practical examples so you understand not only how to implement them, but also why they are important in real-world software development.

What You Will Learn

• Object-Oriented Programming: Understand interfaces, abstract classes, encapsulation, data hiding, and polymorphism.
• SOLID Principles: Learn and apply all five SOLID principles to create clean and maintainable code.
• Design Patterns: Understand and implement Factory, Strategy, Observer, and Singleton patterns.
• System Modeling: Identify entities, attributes, and relationships when analyzing real-world problems.
• UML Class Diagrams: Learn to visualize classes, attributes, methods, and relationships before implementation.
• Practical Project: Design and implement a Taxi Booking System using Java.

Course Structure

Phase 1: Object-Oriented Programming

• Introduction to Low-Level Design
• Interfaces and Abstract Classes
• Encapsulation and Data Hiding
• Polymorphism

Phase 2: SOLID Principles

• Single Responsibility Principle
• Open/Closed Principle
• Liskov Substitution Principle
• Interface Segregation Principle
• Dependency Inversion Principle

Phase 3: Design Patterns

• Factory Pattern
• Strategy Pattern
• Observer Pattern
• Singleton Pattern

Phase 4: System Modeling

• Identifying Entities, Attributes, and Relationships
• UML Class Diagrams

Phase 5: Hands-On Project

• Design and Implementation of a Taxi Booking System

Who Should Take This Course?

• Students who know Java fundamentals and want to improve their software design skills.
• Beginners who want to understand Low-Level Design from scratch.
• Aspiring software developers preparing for software engineering careers.
• Java developers who want to write cleaner and more maintainable code.
• Anyone interested in learning OOP, SOLID principles, and design patterns through practical examples.

Prerequisites

• Basic knowledge of Java programming.
• Familiarity with variables, loops, conditional statements, and methods.
• No prior knowledge of Low-Level Design, SOLID principles, design patterns, or UML is required.

Start Your Low-Level Design Journey!

By the end of this course, you will have a strong foundation in Low-Level Design and understand how to apply OOP concepts, SOLID principles, and design patterns when building real-world Java applications.

Let’s learn, design, and build!