Web Reference: We create a stream of Widget objects via Collection.stream(), filter it to produce a stream containing only the red widgets, and then transform it into a stream of int values representing the weight of each red widget. 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. Stream.flatMap, as it can be guessed by its name, is the combination of a map and a flat operation. That means that you first apply a function to your elements, and then flatten it.
YouTube Excerpt: This tutorial will guide you How & when to use map() and faltMap()
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