What is the purpose of the flatMap() method in the Stream API?
- To collect the elements of the stream into a list
- To filter elements based on a given predicate
- To flatten a stream of streams into a single stream
- To perform an operation on each element in the stream
The flatMap() method in the Stream API is used to flatten a stream of streams into a single stream. It is particularly useful when you have a stream of elements, and each element is itself a stream (e.g., a stream of lists). flatMap() will merge all these sub-streams into one, providing a single stream of elements. This is different from map(), which produces a stream of streams.
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