[java] Java 8 - Difference between Optional.flatMap and Optional.map

You can refer below link to understand in detail (best explanation which I could find):

https://www.programmergirl.com/java-8-map-flatmap-difference/

Both map and flatMap - accept Function. The return type of map() is a single value whereas flatMap is returning stream of values

<R> Stream<R> map(Function<? super T, ? extends R> mapper)

<R> Stream<R> flatMap(Function<? super T, ? extends Stream<? extends R>> mapper)

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