HappyCoders Developer Blog: Java, Algorithms, Data Structures

Hexagonal Architecture - What Is It? Why Should You Use It?

Sven WoltmannJanuary 18, 2023

What is Hexagonal Architecture (Ports & Adapters) – Advantages over Layered Architecture – Hexagonal Architecture, Microservices and DDD

Java 20 Features
(with Examples)

Sven WoltmannDecember 12, 2022

The new Java 20 features with examples: Scoped Values (Incubator), Record Patterns (Second Preview), Pattern Matching for switch (Fourth Preview), Foreign Function & Memory API (Second Preview), Virtual Threads (Second Preview), Structured Concurrency (Second Incubator)

Scoped Values in Java

Sven WoltmannDecember 11, 2022

What is a Scoped Value? How to use ScopedValue? How to inherit Scoped Values? What is the difference between ScopedValue and ThreadLocal?

Advent of Code 2022 – Object-oriented Solutions in Java

Sven WoltmannDecember 1, 2022

Here you can find all solutions to Advent of Code 2022. All tasks are implemented in an object-oriented and test-driven way in Java.

Java 19 Features
(with Examples)

Sven WoltmannSeptember 20, 2022

The new Java 19 features with examples: Virtual Threads (Preview), Record Patterns (Preview), Foreign Function & Memory API (Preview) + more.

How to Change Java Versions in Windows
(Updated for Java 19)

Sven WoltmannSeptember 20, 2022

In this article, I'll show you how to install several Java versions simultaneously in Windows and how to switch between them on the command line with short commands.

Radix Sort – Algorithm, Source Code, Time Complexity

Sven WoltmannJuly 19, 2022

How does Radix Sort work? How to implement Radix Sort in Java? What is the time and space complexity of Radix Sort?

Virtual Threads in Java
(Project Loom)

Sven WoltmannJune 14, 2022

Virtual threads in Java (Project Loom): What are virtual threads? Why do we need them? How do they work? How to use them?

Structured Concurrency in Java with StructuredTaskScope

Sven WoltmannJune 13, 2022

What is Structured Concurrency and why do we need it? How does StructuredTaskScope work? What is the advantage of Structured Concurrency?

Stack vs. Queue

Sven WoltmannJune 8, 2022

What are the differences between the stack and queue data structures? How do the corresponding Java interfaces and classes differ?

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