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IntStream flatMap() method in Java
The flatMap() method of the IntStream class returns a stream consisting of the results of replacing each element of this stream with the contents of a mapped stream produced by applying the provided mapping function to each element.
The syntax is as follows
IntStream flatMap(IntFunction<? extends IntStream> mapper)
Here, mapper is a stateless function to apply to each element.
Create an IntStream with elements
IntStream intStream1 = IntStream.of(20, 40, 60, 80, 100, 120, 140);
Now, use the flatMap() function to set a condition that would be replace each element of this stream
IntStream intStream2 = intStream1.flatMap(val -> IntStream.of(val + val));
The following is an example to implement IntStream flatMap() method in Java
Example
import java.util.*; import java.util.stream.IntStream; public class Demo { public static void main(String[] args) { IntStream intStream1 = IntStream.of(20, 40, 60, 80, 100, 120, 140); IntStream intStream2 = intStream1.flatMap(val -> IntStream.of(val + val)); intStream2.forEach(System.out::println); } }
Output
40 80 120 160 200 240 280z
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