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. Jul 6, 2024 · In this article, we delved into merging a stream of maps in Java and presented several methods to handle various scenarios, including merging maps containing duplicate keys and gracefully handling null values. Jan 16, 2026 · Java 8 introduced the Stream API, a powerful tool for processing collections in a declarative, functional style. Among its many operations, flatMap stands out as a critical method for handling nested collections —specifically, for "flattening" lists of lists into a single list of elements.
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