Stream sum Java
List<Integer> integers = Arrays.asList(1, 2, 3, 4, 5);
Integer sum = integers.stream()
.collect(Collectors.summingInt(Integer::intValue));
Fierce Flatworm
List<Integer> integers = Arrays.asList(1, 2, 3, 4, 5);
Integer sum = integers.stream()
.collect(Collectors.summingInt(Integer::intValue));int total = numbers.stream().mapToInt(i -> i.intValue()).sum();
System.out.print(total);List<Integer> integers = Arrays.asList(1, 2, 3, 4, 5);
Integer sum = integers.stream()
.reduce(0, Integer::sum);