Question

use java streams to find a general integral using simpsons method. use paralell streams if possible.

Answer 1

//a simple program to demonstrate the use of stream in java import java.util.*; import java.util.stream.*;    class Demo {   public static void main(String args[])   {        // create a list of integers     List<Integer> number = Arrays.asList(2,3,4,5);        // demonstration of map method     List<Integer> square = number.stream().map(x -> x*x).                            collect(Collectors.toList());     System.out.println(square);        // create a list of String     List<String> names =                 Arrays.asList("Reflection","Collection","Stream");        // demonstration of filter method     List<String> result = names.stream().filter(s->s.startsWith("S")).                           collect(Collectors.toList());     System.out.println(result);        // demonstration of sorted method     List<String> show =             names.stream().sorted().collect(Collectors.toList());     System.out.println(show);        // create a list of integers     List<Integer> numbers = Arrays.asList(2,3,4,5,2);        // collect method returns a set     Set<Integer> squareSet =          numbers.stream().map(x->x*x).collect(Collectors.toSet());     System.out.println(squareSet);        // demonstration of forEach method     number.stream().map(x->x*x).forEach(y->System.out.println(y));        // demonstration of reduce method     int even =        number.stream().filter(x->x%2==0).reduce(0,(ans,i)-> ans+i);        System.out.println(even);   } Any problem pls comment it