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Hi, I’m Emanuel Trandafir, a Java developer from Romania. I have a strong passion for clean code, software design, and unit testing. Outside of work, I enjoy sports, specifically rock climbing. While I used to run long distances, I’ve now switched to the thrill of climbing.

Welcome to my blog where you’ll find anything from hands-on articles about popular Java topics to language-agnostic articles about best practices, clean code, software design, and unit testing.

In addition to informative content, I also enjoy getting into technical discussions and hearing different perspectives. That’s why I encourage my readers to be active and leave comments on my articles.
Let’s engage in thought-provoking conversations and learn from one another!

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Functional Programming

• Functors And Endofunctors Examplined in 3 Minutes
• Monoids in Java: Functional Programming for O.O.P. Developers
• Monoids Explained for Dummy F.P. Developers (Such as Myself)
• Three Exception-Handling Alternatives Inspired by Functional Programming
• The 3 Ways Of Passing Functions in Functional Programming
• Functional-Style Java vs. Clojure
• Build An Expressive Domain With Monads And Polymorphism

Object Oriented Programming

• The Decorator Pattern in 3 Minutes
• Mind-Bending Exercise: An O.O.P. World Without Classes
• O.O.P. and Functional Programming in 5 Lines Of Code

Java

• Misleading Usage of @Column(nullable=false)
• From a Lombok Christmas Tree To True Java Encapsulation
• Replace Lombok’s @Builder with Fluent Setters
• Pros and Cons of Java Optional
• Records Are Here! Can We Remove Lombok Already?
• These 3 Lombok Annotations Might Skyrocket In Popularity After Java 17 Migration
• My 5-Step Checklist When Switching From Stream to ParallelStream
• Polymorphic Stream Collector In Java
• All 13 Ways to Consume a Stream in Java

Software Design

• Quit Believing In Framework “Magic”!
• The “Secret” Design That Leads To Complete Framework Independence (Hexagonal Architecture / Clean Architecture)
• Each of the SOLID Principles Explained in Less Than 20 Seconds
• Component Cohesion Principles Explained for Junior Developers
• Uncle Bob’s Advice on Stability and Abstraction
• Explaining the Open-Closed Principle to the Rubber Duck
• The Ying And Yang Of Software Development
  (Coupling, Cohesion, Single Responsibility Principle)
• Lightweight Strategy Pattern using Lambda Functions
• Static Methods in Java: 5 Challenges and 1 Advantage
• O.O.P. and Functional Programming in 5 Lines Of Code
• The Dark Side of Primitive Obsession: Five Harmful Impacts
• Uncle Bob, We’ve Failed You!
  (Clean Architecture, Usecase-Driven Design)
• Build An Expressive Domain With Monads And Polymorphism
• The Decorator Pattern in 3 Minutes

Unit Testing

• How SOLID are Your Unit Tests?
• The Art of Writing Beautiful Unit Tests
• Unleash The True Potential Of JUnit5 And B.D.D.
  (JUnit5’s @ParameterizedTest, @CsvSource and ArgumentConvertor)
• Streamline Your Testing Workflow with JUnit 5 Dynamic Tests
  (JUnit5’s Dynamic tests and @TestFactory)
• Java’s AssertJ: The Secret Weapon for Painless Testing
  (AssertJ — unit testing library)
• The Anatomy Of Mocks In Unit Testing
  (Mocks vs Stubs vs Fakes)
• Testing Done Right: Focus on What Matters
• Write Tests That Tell a Story
  (JUnit5’s @Nested annotation)
• JUnit5 Callbacks in Less Than 3 Minutes