Java Streams - LongStream flatMap(LongFunction mapper) example

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LongStream flatMap(LongFunction<? extends LongStream> mapper) returns a stream by mapping function. This is an intermediate operation.

Syntax

flatMap has the following syntax.

LongStream flatMap(LongFunction<? extends LongStream> mapper)

Example

The following example shows how to use flatMap.

import java.util.stream.LongStream;

public class Main {
  public static void main(String[] args) {
    LongStream b = LongStream.of(1L, 2L, Long.MAX_VALUE, Long.MIN_VALUE);

    b.flatMap(n -> LongStream.of(n)).forEach(System.out::println);
  }
}

The code above generates the following result.

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