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Achievement: YOLOAchievement: Pair ExtraordinaireAchievement: QuickdrawAchievement: Pull Sharkx3Achievement: Arctic Code Vault ContributorAchievement: Starstruckx2

Achievements

Achievement: YOLOAchievement: Pair ExtraordinaireAchievement: QuickdrawAchievement: Pull Sharkx3Achievement: Arctic Code Vault ContributorAchievement: Starstruckx2

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SvenWoltmann/README.md

Hi there 👋

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, trainer, speaker, and course instructor.

I share my knowledge about Java, architecture, algorithms, and data structures in videos, my newsletter, and my blog HappyCoders.eu.

HappyCoders logo

JavaLand 2025 - I'm a Speaker


Java Versions PDF Cheat Sheet

Stay up-to-date with the latest Java features with this PDF Cheat Sheet!

Java Versions PDF Cheat Sheet Mockup

  • Avoid lengthy research with this concise overview of all Java versions up to Java 23.
  • Discover the innovative features of each new Java version, summarized on a single page.
  • Impress your team with your up-to-date knowledge of the latest Java version.

👉 Download the Java Versions PDF

(Hier geht's zur deutschen Version → Java-Versionen PDF)


The Big O Cheat Sheet

With this 1-page PDF cheat sheet, you'll always have the 7 most important complexity classes at a glance.

Big O PDF Cheat Sheet Mockup

  • Always choose the most efficient data structures and thus increase the performance of your applications.
  • Be prepared for technical interviews and confidently present your algorithm knowledge.
  • Become a sought-after problem solver and be known for systematically tackling complex problems.

👉 Download the Big O Cheat Sheet

(Hier geht's zur deutschen Version → O-Notation Cheat Sheet)


🇩🇪 An alle Java-Programmierer, die durch fundierte Kenntnisse über Datenstrukturen besseren Code schreiben wollen

Trage dich jetzt auf die Warteliste von „Mastering Data Structures in Java“ ein, und erhalte das beste Angebot!

Mastering Data Structures Mockup

👉 Zur Warteliste

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  1. pathfinding pathfinding Public

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

    Java 35 23

  2. sorting-algorithms-ultimate-guide sorting-algorithms-ultimate-guide Public

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

    Java 18 9

  3. binary-tree binary-tree Public

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

    Java 35 23

  4. o-notation-and-time-complexity o-notation-and-time-complexity Public

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

    Java 14 7

  5. color-thief-java color-thief-java Public

    Grabs the dominant color or a representative color palette from an image. A very fast Java port of Lokesh Dhakar's JavaScript version.

    Java 231 40

  6. hexagonal-architecture-java hexagonal-architecture-java Public

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

    Java 111 32