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Code Kata collection for JVM Languages and Libraries.

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What is a Code Kata?

  • A hands-on programming exercise which helps hone your skills through practice.
  • Code Katas are usually set up as a series of unit tests which fail. Your task is to make them pass.

I hear and I forget.
I see and I remember.
I do and I understand.

-- Confucius

Katalogue

  • Java Lambda Kata - Practice and learn Java 8 lambdas with simple exercises
  • Deck of Cards Kata - Practice using Java 8 Streams, Eclipse Collections, Guava, Apache Commons and/or Vavr on a simple domain
  • Donut Kata - Practice and learn more advanced Eclipse Collections APIs using Java or Kotlin
  • Calendar Kata - Practice and learn the APIs in the Java 8 Date/Time and ThreeTen-Extra libraries.
  • CodePoint Kata - Read a secret message from a file into memory, translate it and then write out the revealed message to a file.
  • JMH Kata - Experiment with the Java Microbenchmark Harness by running and writing micro-benchmark performance comparisons.
  • Pitest Mutation Kata - Practice and learn how to improve the quality of your tests by hunting mutants.
  • Kata of Katas - Practice and learn advanced methods in Eclipse Collections.
  • Coffee Shop Kata - Practice and learn the latest Java features while comparing them with the older ones.

Other Katas

What you will need to build the katas

  1. Java 21
  2. Maven 3.6.1+
  3. IDE of your choice