Book: Eclipse Collections Categorically
Eclipse Collections Categorically: Level up your programming game.
JavaOne and done!
Eclipse Collections Categorically is now available in paperback (color) as of March 16th, 2025. This is the day I arrived in San Francisco for JavaOne 2025. The book was released just in time to be available for purchase during JavaOne which takes place from March 18–20. Thank you in advance if you buy a copy! 🙏
TL;DR — Book link
I will be giving a talk on Thursday March 20 with Vladimir Zakharov on Data Frames in Java. There are a lot of great talks to choose from this week, but I would be honored if you would join our talk. If you order the book and the book gets delivered in time and you bring it to our talk, I will be happy to sign it for you outside the room.
You can spot me walking around at JavaOne wearing one of these t-shirts that has a picture that is very similar to the cover of the book. I will also be in the JavaOne Community Keynote on Thursday morning.
This is my first book , and I’ve been focused on writing this book for the past year plus. It only took me twenty-one years to write this book. This is the book that I never knew I wanted to write, after I created and open sourced a collections framework in Java and then proceeded to work on for two decades. Life is funny, and usually happens when you are busy making other plans.
The paperback book is only available in color. The reaction so far to the over 200 code examples with color syntax highlighting in print has been very positive. A color hardback version of the book and an eBook version will be released eventually.
The nice thing about Eclipse Collections Categorically, like Eclipse Collections itself, is that the book has a long potential shelf life. Eclipse Collections is now twenty-one years old, and Eclipse Collections Categorically should continue to be relevant and useful to developers for a very long time, whether or not they regularly use Eclipse Collections.
Programming is a marvelous craft. I hope this book brings the joy of programming to those who read it. It has renewed the joy of programming I felt when I was eleven years old. This book is meant to be as fun to read on the inside as it is to look at on the outside.
Eclipse Collections is over one million lines of code. Eclipse Collections Categorically slices this feature-rich Java library up into several easy to remember categories of methods. If you can’t remember all the categories, they’re all available on the cover. In this sense, you can judge the contents of this book by its cover, and also by its t-shirt.
A quick guide to categories on the t-shirt and cover can be found here:
🟧 Counting
🟧 Testing
🟧 Finding
🟧 Filtering
🟧 Transforming
🟧 Grouping
🟧 Aggregating
🟧 Converting
🟧 Iterating
🟧 Mutating
Here’s a link to the current paperback version available on Amazon if you are interested in exploring the reading sample and perhaps purchasing. If you buy a copy and can find me at a conference or Java user group meetup, I would be happy to sign it for you.
Thanks, and I hope you enjoy Eclipse Collections Categorically!
I am the creator of and committer for the Eclipse Collections OSS project, which is managed at the Eclipse Foundation. Eclipse Collections is open for contributions.
