Web Reference: Jul 23, 2025 · Both of the functions map () and flatMap are used for transformation and mapping operations. map () function produces one output for one input value, whereas flatMap () function produces an arbitrary number of values as output (ie zero or more than zero) for each input value. 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... Both map and flatMap can be applied to a Stream and they both return a Stream. The difference is that the map operation produces one output value for each input value, whereas the flatMap operation produces an arbitrary number (zero or more) values for each input value.
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