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. map() and flatMap() APIs stem from functional languages. In Java 8, we can find them in Optional,Stream and in CompletableFuture(although under a slightly different name). Streams represent a sequence of objects whereas optionals are classes that represent a value that can be present or absent. We have the map() and flatMap()methods among other agg... It’s the go-to method for transforming data in a stream. But at some point, you’ll try to map a stream of items — and get stuck with a stream of streams. That’s where flatMap() comes in. If map() transforms data, then flatMap() flattens it.
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