Gatherer Lecture

For different Lectures

for Example:

• Java User Group Saarbrücken

  • Stream Gatherers: Effiziente Stream-Verarbeitung in JDK 24 - Karl Heinz Marbaise

• JCon Europe 2025

  • https://schedule.jcon.one/?day=2025-05-13&selectedSession=783537

Used in lectures

• Maven 3.9+

• JDK24+

Finalized for JDK 24:

• https://openjdk.org/jeps/485

• Open JDK 22

  • Stream Gatherer - JEP 461

• Open JDK 23

  • Stream Gatherer - JEP 473 (Second Preview)

• https://www.happycoders.eu/java/stream-gatherers/ (Check for details)

• https://stackoverflow.com/questions/18552005/is-there-a-concise-way-to-iterate-over-a-stream-with-indices-in-java-8

• LSP

  • https://stackoverflow.com/questions/2723397/what-is-pecs-producer-extends-consumer-super

• https://medium.com/@tecnicorabi/mastering-java-collectors-the-ultimate-guide-to-efficient-data-handling-with-streams-2a5530d3ba11

• https://github.com/tginsberg/gatherers4j (check this!)

• https://www.unlogged.io/post/jdk-23-what-to-expect

• https://medium.com/@yassir.acaf/demystifying-java-collectors-5bfb8d4378d2

• https://people.cs.nott.ac.uk/pszgmh/fold.pdf

• https://medium.com/javarevisited/whats-new-with-java-23-698762aa44d1

Example to use it as gatherer:

• https://medium.com/@kamal81094/understanding-streams-api-in-java-8-using-employee-dataset-3935760e5c76

Can we create an example out of this Python part for ZIP:

• https://medium.com/python-in-plain-english/python-zip-and-when-to-use-it-2f863d9d73b7

• Recheck example:

• https://medium.com/gitconnected/18-programming-concepts-youve-never-heard-of-but-should-071df50e2790

• Reference

• https://en.wikipedia.org/wiki/Kahan_summation_algorithm

• https://horstmann.com/unblog/2024-10-01/index.html

• Zipping

  • https://www.morling.dev/blog/zipping-gatherer/ (You should look into it)

  • https://github.com/JosePaumard/more-spliterators/blob/master/src/main/java/org/paumard/spliterators/ZippingSpliterator.java

• Existing Libs (!!)

  • https://github.com/jhspetersson/packrat

  • https://github.com/tginsberg/gatherers4j

• Reread that article very good explanations of Streams

  • https://medium.com/@dip-mazumder/java-stream-api-cdf75a49a181

• Nochmal anschauen:

  • https://jugsaxony.org/downloads/day/slides/JSD2024_Michael-Wiedeking_Zusammengerafft.pdf

• https://blog.payara.fish/introducing-stream-gatherers-jep-461-for-enhanced-java-stream-operations

• https://cr.openjdk.org/~vklang/Gatherers.html

• Arrays are objects

  • https://docs.oracle.com/javase/specs/jls/se21/html/jls-10.html

• DropWhile/Takewhile

  • https://dzone.com/articles/exploring-takewhile-and-dropwhile-in-java

• JEP Café

  • https://www.youtube.com/watch?v=jqUhObgDd5Q

• Good Article

  • https://www.happycoders.eu/java/stream-gatherers/

• Functional Lambda Calculus

  • https://fpilluminated.org/

• Very informative

  • https://daniel.avery.io/writing/the-java-streams-parallel

• Another information about Stream API good information

  • https://sbolligorla.wordpress.com/stream-api/

• Article about algebraic types

  • https://blog.scottlogic.com/2025/01/20/algebraic-data-types-with-java.html

• https://github.com/dpaukov/combinatoricslib3/tree/master?tab=readme-ov-file#3-simple-permutations