Java Utililty Methods List Sum

double f = 0.0;
for (Double score : scores) {
    f += score;
return f;

double x = 0.0;
double floor = (vals.size() == 0 || Double.isInfinite(vals.get(0)) ? 0 : vals.get(0)); 
for (double val : vals) {
    x += val - floor;
return vals.size() * floor + x;

int sum = 0;
for (int i : l) {
    sum += i;
return sum;

Integer result = 0;
for (Integer it : list) {
    result += it;
return result;

return lst.stream().mapToInt(e -> e).sum();

return numbers.stream().mapToInt(Integer::intValue).sum();

double sum = 0;
for (Number value : numbers) {
    sum += value.doubleValue();
return sum;

double sum = 0;
for (T number : listOfNumbers) {
    sum += number.doubleValue();
return sum;

if (list == null || list.size() < 1)
    return 0; 
int sum = 0;
for (Integer i : list)
    sum = sum + i;
return sum;

long sum = 0L;
for (Number item : list) {
    sum = sum + item.longValue();
return sum;