A fun example using Eclipse Collections with Java enums and records The Cartesian Product of Rank and Suit If we have an enum of Rank and enum of Suit, it is trivial to create a Card type using Java Records. It is also trivial to create a deck of cards using the cartesianProduct method from Eclipse Collections…

What are the most frequently used words in the Eclipse Collections API? Background I read the Hitchhiker’s Guide to the Galaxy (HHGTTG) Trilogy when I was a teenager in the 1980s. I ran a Bulletin Board System for a couple years and that was when I was first introduced to the…

Learn how to build a primitive Bag from a primitive Stream in Java. The Output:

Initializing a Map using Eclipse Collections is simple and flexible. I answered the following question on Stack Overflow almost a decade ago. How can I initialise a static Map? I like the Guava way of initialising a static, immutable map: static final Map MY_MAP = ImmutableMap.of( 1, "one", 2…stackoverflow.com If you create a MutableMap in Eclipse Collections using empty and withKeyValue, you can then chain as many key / value combinations as you need. As a final…

A simple Java program using Eclipse Collections Outputs:

After 5 years of blogging, it’s time for me to read more and write less. I made a commitment to writing Five years ago, I committed to writing at least one blog per month. With the exception of March, 2022, I stuck to my commitment. This commitment has been a challenge, but not a burden. I…

See something. Say something. Prove something. Do something. Starting with an Idea In May 2013, I was in traveling on business in London. The GS Collections library had been released to open source on GitHub a year and a half earlier (January 2012). I was a member of the JSR 335 Expert Group, and…

The future of the library no longer requires my continual presence. All grown up I’ve spent 18 years growing a Java collections library named Eclipse Collections. I love this library. It is a great library, and has an amazing community of developers contributing to and supporting it. I will use this library for…