CODEWITHSUNDEEP
javasum
Ericson Willians
Ericson Willians

Reputation: 7845

Is there any method to sum elements in JAVA?

Is there any equivalent of python's sum() in Java?

Upvotes: 2

Views: 6060

Answers (5)

user24598140
user24598140

Reputation: 11

You could consider using myList.stream().mapToDouble(elt -> elt).sum() to sum the elements of your list.

Upvotes: 1

user918545
user918545

Reputation: 93

There is no function like sum() in Java. You may create a function by yourself. Something like this:

    public <T> T countArray(T[] array)
    {
        T tSum = 0;

        for (T t : array)
        {
            tSum += t;
        }

        return tSum;
    }

    public <T> T countCollection(Collection<T> coll)
    {
        T[] array = (T[])coll.ToArray(new T[0]);
        return countArray(array);
    }

Upvotes: 0

Andrejs
Andrejs

Reputation: 27677

You could use StatUtils.sum(double[]) from Apache Commons Math library. The advantage is that StatUtils has other useful functions and Commons Math has many other utils.

Upvotes: 0

Ted Hopp
Ted Hopp

Reputation: 234795

There's nothing built into the language. There are plenty of libraries that do things like that, though. Or write your own three-line routine. How you do it depends on how you are representing your elements (the usual suspects—for double values—being List<Double> or double[]).

Upvotes: 2

christopher
christopher

Reputation: 27336

No. Simply use a loop, to cycle through each element and generate a running total.

Upvotes: 1

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