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Java 9 Concurrency Cookbook - Second Edition by Javier Fernández González

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The Stream class provides other methods to transform the elements of a Stream:

  • mapToInt(), mapToLong(): These methods are identical to the mapToDouble() method, but they generate IntStream and LongStream objects, respectively.
  • flatMapToDouble(), flatMapToInt(), flatMapToLong(): These methods are identical to the flatMap() method, but they work with DoubleStream, IntStream, and LongStream, respectively.

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