Java Streams - DoubleStream mapToInt(DoubleToIntFunction mapper) example

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DoubleStream mapToInt(DoubleToIntFunction mapper) returns an IntStream by applying the given function to this stream. This is an intermediate operation.

Syntax

mapToInt has the following syntax.

IntStream mapToInt(DoubleToIntFunction mapper)

Example

The following example shows how to use mapToInt.

import java.util.stream.DoubleStream;

public class Main {
  public static void main(String[] args) {
    DoubleStream b = DoubleStream.of(1.1,2.2,3.3,4.4,5.5);
    b.mapToInt(n -> {return (int) (n*n);})
     .forEach(System.out::println);
  }
}

The code above generates the following result.

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