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DoubleStream flatMap() method in Java
The flatMap() method of the DoubleStream class returns a stream with the results of replacing each element of this stream with the contents of a mapped stream formed by applying the provided mapping function to each element.
The syntax is as follows
DoubleStream flatMap(DoubleFunction<? extends DoubleStream> mapper)
Here, the parameter mapper is a stateless function to apply to each element which produces a DoubleStream of new values.
The DoubleFunction here is a function that accepts a double-valued argument and produces a result. To use the DoubleStreamclass in Java, import the following package
import java.util.stream.DoubleStream;
The following is an example to implement DoubleStream flatMap() method in Java
Example
import java.util.*;
import java.util.stream.DoubleStream;
public class Demo {
public static void main(String[] args) {
DoubleStream doubleStream1 = DoubleStream.of(7.9, 20.6, 35.3, 68.5, 78.9, 99.4);
DoubleStream doubleStream2 = doubleStream1.flatMap(a -> DoubleStream.of(a+a));
doubleStream2.forEach(System.out::println);
}
}Output
15.8 41.2 70.6 137.0 157.8 198.8
Updated on: 30-Jul-2019
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