[Solved] How do you find the sum of all numbers in a set in Java? [duplicate]

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Aside from using loops explicitly, for List<Integer> list you can do:

int sum = list.stream().mapToInt(Integer::intValue).sum();

If it’s an int[] arr then do:

int sum = IntStream.of(arr).sum();

This is based on the use of streams.

Or you can do this simple one liner loop:

int sum = 0;
for (Integer e : myList) sum += e;

Even better, write a function and reuse it:

public int sum(List<Integer> list) {
    int sum = 0;
    for (Integer e : list) sum += e;

    return sum;
}

solved How do you find the sum of all numbers in a set in Java? [duplicate]