JUnit 5 Extension Pack

Sharpen is an Eclipse plugin created by db4o that allows you to convert your Java project into c#

Several code katas on a racing car theme

Practicing the Java Module System - Devoxx PL

Repository for ports and adapters kata

Refactoring exercise where data layer and business layer are not clearly separated

For practicing refactoring, removing duplication, and making code more flexible

Exercises to practice breaking dependencies to test legacy code.

Code from Michael Feathers presentation about "Tell, Don't Ask" at Craft 2019

Reimplementing lambda calculus in Java 8 for fun and profit.

a kata for practicing both testing with Combination Approvals and 'Split Phase' refactoring

a refactoring exercise with a complex conditional for dividing overtime hours into two rates

refactoring kata where you need a mock or stub

starting code and instructions to help you with the Scrabble kata

Testing Koans to understand how to write unit tests with different frameworks.

sample code for explaining the Law of Demeter

A Maven plugin to detect package cycles in Java code.

JavaNCSS - Source Measurement Suite for Java

Demo of a webapp with flawed security, for training purposes.

Java reactive streams workshop: basic implementations of Publisher, Subscriber, Subscription and Processor.

exercise to practice getting a void function with no arguments under test and refactored

Counter dashboard of positive and negative push events during Coding Dojo "championships".

Kata exercises that have user interfaces.

Refactoring kata for training removal of "instanceof"

This is the JavaScript game of Tron in 219 bytes prepared as Refactoring Kata in different languages.