SvenWoltmann

hexagonal-architecture-java

This repository contains a sample Java REST application implemented according to hexagonal architecture.

binary-tree

Source Code for HappyCoders.eu article series on tree data structures (binary tree, binary search tree, AVL tree, red-black tree).

pathfinding

Source code for the HappyCoders.eu articles on pathfinding and shortest path algorithms (Dijkstra, A*, Bellman-Ford, Floyd-Warshall).

sorting-algorithms-ultimate-guide

Sorting algorithm source codes + ultimate test to compare the performance of all algorithms. For my HappyCoders.eu article.

o-notation-and-time-complexity

Code examples demonstrating the complexity classes O(1), O(log n), O(n), O(n log n), O(n²).

advent-of-code-2022

Advent of Code 2022 – Object-Oriented Solutions in Java: https://www.happycoders.eu/algorithms/advent-of-code-2022/

structured-concurrency

Demo code showing how to use Java's StructuredTaskScope

virtual-threads

Demo code showing how to use Java's virtual threads.

binary-search

Binary search implementation in Java (recursive and iterative). Comparison with linear search. Runtime test of binary and linear search.

internet-address-resolution-spi-jep-418-demo

A rudimentary demonstration on how to use the Internet-Address Resolution SPI defined in JEP 418 introduced in Java 18. Article: https://www.happycoders.eu/java/java-18-features/

java-collections-guide

Java Queue, Deque, Stack and other collections - Ultimate Guide on HappyCoders.eu.

advent-of-code-2015

Advent of Code 2015 – Object-Oriented Solutions in Java: https://www.happycoders.eu/algorithms/advent-of-code-2015/

application-cds-demo

A minimal application for demostrating application class-data sharing (AppCDS).

ffm-api-demo

Demonstration of Java's Foreign Function & Memory API

virtual-threads-spring

Spring demo application to compare controllers using CompletableFuture vs. virtual threads.

biased-locking

A JMH benchmark demostrating the effects of disabled biased locking in Java 15.

happycoders-tutorial-server-setup

Source code for HappyCoders.eu Ansible tutorial.

java-kata

Maven project for Java Katas containing only a class, a test class, and dependencies to JUnit, AssertJ, and Mockito

java-random-demo

Java random number generation demos. Article on HappyCoders.eu.

java-structured-concurrency-demo

Demo code for the HappyCoders.eu article "Structured Concurrency with Java".

jenkins-tutorial-demo

Code for HappyCoders.eu Jenkins tutorial explaining the installation and major features of Jenkins.

pattern-matching-for-switch

Pattern Matching for Switch Examples

project-a

Source code for the HappyCoders.eu article about Git Monorepos.

project-b

Source code for the HappyCoders.eu article about Git Monorepos.

sparse-checkout-demo

Source code for the HappyCoders.eu article about Git Monorepos.

string-substring-demo

A demonstration of the String.substring() method and its evolution from Java 1.2 to today.

scoped-values

Demo code showing how to use Java's scoped values

structured-concurrency-quarkus

Quarkus demo application to show how to introduce structured concurrency using StructuredTaskScope.

SvenWoltmann

virtual-threads-quarkus

Quarkus demo application to compare controllers using platform threads, CompletableFuture, and virtual threads.