# Hidden Treasures of Eclipse Collections 2025 Edition

DevFeed: [Hidden Treasures of Eclipse Collections 2025 Edition](<https://devfeed.tech/articles/hidden-treasures-of-eclipse-collections-2025-edition-23019.md>)

Original publisher: [Read original article](<https://www.javaadvent.com/2025/12/hidden-treasures-of-eclipse-collections-2025-edition.html>)

Author: Nikhil Nanivadekar

Published: 2025-12-13T03:03:52Z

Content type: tutorial

Language: en

Sources: [Java Advent Calendar](<https://devfeed.tech/sources/java-advent-calendar.md>)

Topics: [Java](<https://devfeed.tech/topics/java.md>), [Framework](<https://devfeed.tech/topics/framework.md>), [Open Source](<https://devfeed.tech/topics/open-source.md>)

Tags: [2025](<https://devfeed.tech/tags/2025.md>), [blog](<https://devfeed.tech/tags/blog.md>), [collections](<https://devfeed.tech/tags/collections.md>), [java](<https://devfeed.tech/tags/java.md>), [open-source](<https://devfeed.tech/tags/open-source.md>), [programming](<https://devfeed.tech/tags/programming.md>)

## AI overview

A tutorial demonstrating four lesser-known features of the open source Eclipse Collections framework for Java, including collection-to-map transformation, occurrence counting, grouping and summing, and aggregation.

## Source excerpt

Eclipse Collections is an open source Java Collections framework. In this blog I am going to demonstrate four lesser known features of the framework. I have published similar blogs in Java Advent Calendars of 2018, 2019, 2020, 2021, 2022, 2023, and 2024. Please refer to the resources at the end of the blog for more [...] The post Hidden Treasures of Eclipse Collections 2025 Edition appeared first on JVM Advent.