# Working with Java Streams

A Java stream works like ETL for in-memory data, taking a collection, transforming it step by step, then collecting the result.

![Cheat sheet: Working with Java Streams](https://fsdtrainingmedia.blob.core.windows.net/public/images/2026/11/49e59283591d4adf8c54e37ec39a9b40.webp)

- Category: Java
- Level: Journeyman
- Tags: java
- Updated: November 3, 2026

Source: https://www.ask-codey.com/cheat-sheets/what-is-a-stream-working-with-java-streams-cheat-sheet