Multiple threads to calculate sums Java

Question

this is how I can find sum of array. p[i] - array of random integers, size 1000

sum = 0;
for (int j = 1; j < p.length; j++ ) 
    {
            sum = sum + p[j];
    }

my question is how can I use multiple threads to perform it faster?

Possible duplicate of [What is the easiest way to parallelize a task in java?](https://stackoverflow.com/questions/2016083/what-is-the-easiest-way-to-parallelize-a-task-in-java) — Daniele, May 29 '18 at 20:00

score 1 · Answer 1 · answered May 29 '18 at 19:56

1

Simply:

int sum = Arrays.stream(p).parallel().sum();

answered May 29 '18 at 19:56

Jean Logeart

1

Although this might answer the question, I'm not sure it helps anyone understand why and how it works. – Liora Haydont May 29 '18 at 19:58

1 Answers1