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. Aug 26, 2023 · Learn to use Java Stream flatMap () method which is used to flatten a stream of collections to a stream of elements combined from all collections. The flatMap () method is a must-know tool for any Java developer working with streams, optionals, or modern APIs.
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