Clean Code with Java examples
What you'll learn
- How to write clean code
- How to keep your functions small
- How to name your variables, functions and classes
- How many parameters a function should have
- What to do about boolean, nullable and return parameters
- How clean code affected MVC
- How to beautify predicates
- Why comments are bad and when you can use them
- The difference between an OOP object and a Data Structure Object
- What kind of exceptions to use
- Why composition is good and inheritance is bad
- What are the symptoms of bad code
- What state is and why it's important
- Why your code should have low coupling and high cohesion
- How to avoid spaghetti code
- What are Command and Query separation, Tell Don't Ask and The Law of Demeter
- The test pyramid and TDD
- How over-engineering is not a solution to bad code
- You have to know the basics of writing code (in a language like Java, or PHP, or Python or C#)
This is a course about useful clean code principles.
My aim is to teach you concepts that you can use every time you write code.
The course has Java examples and I sometimes mention things like Spring and Lombok.
The same clean code principles apply also to PHP, C# and Python.
What can this course do for you?
It can save your company and yourself a lot of development time and therefore a lot of money.
Bad code practices can make development very slow on your medium and big projects.
This means a lot of money wasted on development time.
This type of projects are also remarkably unpleasant to work on.
This course helps you avoid this by using clean code principles.
The course is structured in 4 parts:
1. Introduction - where we discuss what is clean code and why it's important
2. Small Functions - I gave small functions an entire section because I think its one of the most important principles of clean code, together with small classes, Single Responsibility Principle and Not crossing Different Levels of Abstraction.
3. Clean code: Fundamental Principles - I discuss here about fundamental things like method and variables names, parameters, comments and exceptions
4. Clean code: Advanced Principles - Here I talk about more abstract topics like the difference between an OOP Object and a Data Structure Object, Composition over Inheritance, Symptoms of Bad Code, State, Low Coupling - High Cohesion, Command and Query Separation, Tell Don't Ask, The Law of Demeter and more.
The course also contains some memes because you can't spell clean code without fun.
I tried to focus on things you can use every day when programming and stay away from barren theory.
There's no point wasting our time with useless knowledge that would just seem like it's helping you as a programmer, but that you will forget in 2 weeks.
If that would have been the point, this would be a 10 hours course about programming patterns.
But it isn't.
I tried to make the course full of useful information but not too long.
If you invest as little as two hours of your life in this course, about the time you would spend watching a movie, you will become a much better developer.
Who this course is for:
- Starter developers that want to learn clean code to write maintainable applications
- Intermediate developers that want to improve their clean code skills
- Senior developers that want to fine tune their clean code mastery and like programming principles
I am a big fan of using and helping others use agile/scrum and writing and helping others write easy to maintain code.
I am passionate about writing easy to maintain code and I tried to help the programming community with my courses on this subject.
I'm also a big fan of Agile and SCRUM and how you can build motivated, happy teams around it.
I've worked on a lot of types of projects. From small to medium projects where I was the only developer to medium and big projects in teams of 30+ people.
Besides being a developer, in the last five years I've also have the Scrum Master role, or led the process of applying Scrum inside the team.
I am currently writing mostly Java, and have certifications in PHP and Scrum.