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Sum of list java

Sum and array list java

int sum = (list.stream().
        mapToInt(i -> i.intValue()).sum()

3

Sum of list java

double sum = 0;
for(int i = 0; i < m.size(); i++)
    sum += m.get(i);
return sum;

1

Source: stackoverflow.com

Inbuild method to sum of an arraylist elements in java

doubleList.stream().reduce((a,b)->a+b).get();

1

Source: stackoverflow.com

Inbuild method to sum of an arraylist elements in java

//If you have a List<Integer>
int sum = list.stream().mapToInt(Integer::intValue).sum();

//If it's an int[]
int sum = IntStream.of(a).sum();

-1

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