Find Sum of digits for given number in java 8?

Question

Suppose

Example1: number is 37 Sum of numbers is 3+7= 10

Ex2: Number is 1000 Sum of numbers is 1+0+0+0 = 1.

My first approach was converting number to string and then char array. With that I could use stream in which I converted chars to their int values which let me performed sum.

But is there any utility method in Stream API which could improve it?

I'll guess you would have to implement an custom `Spliterator`, but this is not a beginners task. Suggest to learn `while` loops first. — Gyro Gearless, May 19 '21 at 18:41
Ok. I tryied to do with converting number to string then char array.. then stream. Then intValue from stream. Then performed sum. Is there any utility method i am asking? Or simple way — Naresh_Nalla, May 19 '21 at 18:42
already answered here https://stackoverflow.com/a/35072547/14159142 — l4zs, May 19 '21 at 18:44
@Gyro.. i used while loop with reminder concept. But It is taking more than 5sec. There is time limit for that. — Naresh_Nalla, May 19 '21 at 18:45

score 3 · Answer 1 · answered May 19 '21 at 18:49

3

    public long getSumOfDigits(int number)
    {
        return Stream.of(String.valueOf(number).split(""))
                .collect(Collectors.summarizingInt(Integer::parseInt))
                .getSum();
    }

answered May 19 '21 at 18:49

pcsutar

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Find Sum of digits for given number in java 8?

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