Name: Sven Woltmann
Type: User
Company: HappyCoders.eu
Bio: Java Scalability and Performance Specialist – Freelancer – Trainer – Author of HappyCoders.eu
Twitter: svenwoltmann
Location: Berlin, Germany
I am a passionate Java programmer focusing on scalable enterprise applications, optimization of algorithms, clean code, and clean architecture.
I work as an independent developer, coach, and course instructor.
I share my knowledge about Java, architecture, algorithms, and data structures in videos, my newsletter, and my blog HappyCoders.eu.
advent-of-code-2015
Advent of Code 2015 – Object-Oriented Solutions in Java: https://www.happycoders.eu/algorithms/advent-of-code-2015/
advent-of-code-2022
Advent of Code 2022 – Object-Oriented Solutions in Java: https://www.happycoders.eu/algorithms/advent-of-code-2022/
application-cds-demo
A minimal application for demostrating application class-data sharing (AppCDS).
beats
:tropical_fish: Beats - Lightweight shippers for Elasticsearch & Logstash
biased-locking
A JMH benchmark demostrating the effects of disabled biased locking in Java 15.
binary-search
Binary search implementation in Java (recursive and iterative). Comparison with linear search. Runtime test of binary and linear search.
binary-tree
Source Code for HappyCoders.eu article series on tree data structures (binary tree, binary search tree, AVL tree, red-black tree).
bytebuffer-demo
This demo shows how a ByteBuffer and its flip() and compact() methods work.
color-thief-java
Grabs the dominant color or a representative color palette from an image. A very fast Java port of Lokesh Dhakar's JavaScript version.
comparator-comparable-compareto
Source code for my HappyCoders.eu article about comparing objects in Java using Comparable, Comparator, compareTo().
deep-reflection
How can Java Reflection be used to change the values of Integers and Strings at runtime?
ffm-api-demo
Demonstration of Java's Foreign Function & Memory API
filechannel-bytebuffer-memory-mapped-io-locks
Demos for writing and reading files with FileChannel and ByteArray. Tests for write speed with RandomAccessFile, FileChannel, heap buffer, native buffer, memory-mapped buffer, and FileOutputStream.
files-structured-data
Source code for my HappyCoders.eu article about writing structured data with DataOutputStream, DataInputStream, ObjectOutputStream and ObjectInputStream.
happycoders-tutorial-server-setup
Source code for HappyCoders.eu Ansible tutorial.
hexagonal-architecture-java
This repository contains a sample Java REST application implemented according to hexagonal architecture.
int-to-string-benchmarks
JMH benchmark tests to find out what is the fastest way to convert an int into a String in Java.
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.
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-sparkpost
SparkPost client library for Java; forked to fix a bug where data string sent to the API was converted to a byte array twice.
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.
o-notation-and-time-complexity
Code examples demonstrating the complexity classes O(1), O(log n), O(n), O(n log n), O(n²).
pathfinding
Source code for the HappyCoders.eu articles on pathfinding and shortest path algorithms (Dijkstra, A*, Bellman-Ford, Floyd-Warshall).
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.
scoped-values
Demo code showing how to use Java's scoped values
React
A declarative, efficient, and flexible JavaScript library for building user interfaces.
🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
Typescript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
An Open Source Machine Learning Framework for Everyone
Django
The Web framework for perfectionists with deadlines.
Laravel
A PHP framework for web artisans
Bring data to life with SVG, Canvas and HTML. 📊📈🎉
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
Some thing interesting about web. New door for the world.
A server is a program made to process requests and deliver data to clients.
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
Some thing interesting about visualization, use data art
Some thing interesting about game, make everyone happy.
Facebook
We are working to build community through open source technology. NB: members must have two-factor auth.
Microsoft
Open source projects and samples from Microsoft.
Google
Google ❤️ Open Source for everyone.
Alibaba
Alibaba Open Source for everyone
D3
Data-Driven Documents codes.
Tencent
China tencent open source team.
