SOLID principles & Design Patterns for Java programmers

Welcome to our Design Patterns & SOLID Principles course, developed with Java programmers in mind. We launched the course back in 2025 but are continually checking and updating the coursework as we go along. Our course will help you understand and discover the Design Patterns created by the Gang of Four (Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides) who wrote the book "Design Patterns: Elements of Reusable Object-Oriented Software".

Design Patterns are general solutions to problems that appear over and over again in complex applications. Whether you are familiar with the topic and need a recap, or are starting your programming studies, this course is for you. With a brilliant look at the theory of this topic, the course also brings a practical element into it whereby you can test your own programming skills through our Eclipse projects.

Understanding Design Patterns gives you a broad catalogue of general solutions to tackle even the most complicated programming tasks, which have been discovered, analysed and described in detail by the Gang of Four in their book. What are Design Patterns. Design Patterns are identified as 23 general, repeatable solutions to problems that we are likely to come across as a programmer and were developed by the infamous Gang of Four.

They are divided into 3 main categories: creational, structural and behavioural. We take a look at each of these patterns and explain them in an easy to follow manner, explaining how they can be used to elegantly solve problems while complying with the requirements of encapsulation, extensibility and other factors that a professional design requires. What are SOLID Principles.