Computer scienceProgramming languagesJavaCode organizationFunctional programmingFunctional streams

Parallel streams

Inverting streams

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There is a new challenge. Someone has not correctly chosen the types of streams in a program (parallel and sequential).

You need to implement a method that inverts the state of every stream from the given list (parallel → sequential and vice versa).

The method should return a new list of streams which are inverted.

Try to use streams to solve this problem.

Write a program in Java 17

import java.util.*;

import java.util.stream.*;

public class Main {

private static List<LongStream> invertedStreams(List<LongStream> streams) {

// write your code here

return streams;

}

/* Do not modify the code below */

public static void main(String[] args) {

Scanner scanner = new Scanner(System.in);

List<Boolean> parallelFlags = Arrays

.stream(scanner.nextLine().split("\\s+"))

.map(Boolean::parseBoolean)

.collect(Collectors.toList());

// :)

List<LongStream> streams = Stream

.iterate(0,

i -> i < parallelFlags.size(),

i -> i + 1)

.map(i -> {

var stream = LongStream.of();

if (parallelFlags.get(i)) {

stream = stream.parallel();

}

return stream;

}).collect(Collectors.toList());

List<String> invertedParallelFlagsAsStrings =

invertedStreams(streams).stream()

.map(LongStream::isParallel)

.map(Object::toString)

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