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... Aug 27, 2023 ¡ The Java 8 Stream interface contains the map () and flatMap () methods that process the elements of the current Stream and return a new Stream. Both methods are intermediate stream operations and serve distinct purposes.
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