8/20/2023 0 Comments Objects first with java![]() To state this principle more technically: Only one potential change (database logic, logging logic, and so on.) in the software’s specification should be able to affect the specification of the class. The Single Responsibility Principle states that a class should do one thing and therefore it should have only a single reason to change. They all serve the same purpose: "To create understandable, readable, and testable code that many developers can collaboratively work on." Therefore, it is not a surprise that all these concepts of clean coding, object-oriented architecture, and design patterns are somehow connected and complementary to each other. Uncle Bob is also the author of bestselling books Clean Code and Clean Architecture, and is one of the participants of the "Agile Alliance". ![]() But the SOLID acronym was introduced later by Michael Feathers. Martin (a.k.a Uncle Bob) in his paper in 2000. The SOLID principles were first introduced by the famous Computer Scientist Robert J. So grab a cup of coffee or tea and let's jump right in! Background Then we are going to get into the nitty-gritty details – the why's and how's of each principle – by creating a class design and improving it step by step. We will start by taking a look into the history of this term. This article will teach you everything you need to know to apply SOLID principles to your projects. So I believe that it is a topic that every developer should learn. These five principles help us understand the need for certain design patterns and software architecture in general. ![]() ![]() They are a set of rules and best practices to follow while designing a class structure. The SOLID Principles are five principles of Object-Oriented class design. As if learning java is not hard enough by itself. This sort of sloppiness makes it very hard to understand what is MEANT instead of SAID. But what is more important: This happens when an item with ANY index number is removed, except when it is the last item with the HIGHEST POSSIBLE index number. For starters, what is low and what is high is completely subjective. The problem for me is the wording 'with a low index number". One example: "If an item with a low index number is removed, then the collection moves all subsequent items along by one position to fill in the gap." When learning a programming language and al sorts of new concepts, I need language to be very precise. It makes me want to re-write almost every sentence. The style is very very sloppy and informal. Then I did an online java mooc at mooc.fi and now I am re-reading this book.Īnd I still think it is hard to understand. And this book has made a great use of that, with its clear writing style and slow yet deep exploration of the subject.Īt first I thought I did not understand this book because I did not understand java. But I can say that it’s a great language to grasp the idea, concepts and techniques of object-oriented programming (OOP). Is Java the best language to learn today? I can’t tell. You’ll learn how to use subclasses, superclasses, abstract classes and methods, interfaces, subtyping, method dispatch and polymorphism, among other inheritance concepts. Approaching inheritance and choosing the right abstraction construct requires some thought and some practice, and these three chapters towards the end walk you through that in a gentle manner so you come out with a proper foundation. It’s the most substantial topic in the book and rightly so. Inheritance features heavily, with 3 entire chapters dedicated to it. This book won’t make you a competent Java programmer but it will still give you a deep understanding of the core concepts -often tricker parts- of the language, namely object-orientation and particularly inheritance. There are also various sections about functional programming. The only thing lacking is directed solutions for the activities, which, if I’m not mistaken, are only available for tutors. The book is generally designed to be supplemented with the presence of a tutor, but it is still entirely possible to make use of around 90% of the material if the subject is self-studied. A deep dive into the world of object-oriented programming, using Java as the vehicle for this journey. ![]()
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