Web Reference: Jan 23, 2026 · In Java, flatMap (Function mapper) is an intermediate Stream operation that transforms each element into a stream and flattens all streams into a single stream. It is used for one-to-many transformations and flattening nested data structures. Imagine we have a bunch of boxes, and each box contains some items. Now, we want to take out all those items from the boxes and put them in a single box. That’s what flatMap() does with a stream. It takes objects from different collections in this stream A and puts all objects in a new Stream B. In layman’s terms, flattening is referred to as mergi... Nov 10, 2025 · Learn about the differences between map () and flatMap () by analyzing some examples of Streams and Optionals.
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