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Java Stream vs

4 min readApr 4, 2025

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This is the member-only article. For free, you can read this article on my blog: Differences Between map() and flatMap() in Java.

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Java 8 introduced the Stream API, which brought a powerful way to process collections using a functional programming style. Two of the most frequently used methods in this API are and .

At first glance, both seem similar — they transform data. But their behavior differs when it comes to dealing with nested structures like .

In this article, we’ll explore the key differences between and using simple explanations, a comparison table, and complete examples with output.

Image credit: https://javaconceptoftheday.com/

📘 Quick Summary: vs

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