JAVA

stream sum java

List<Integer> integers = Arrays.asList(1, 2, 3, 4, 5);
Integer sum = integers.stream()
  .collect(Collectors.summingInt(Integer::intValue));

java stream sum integers

List<Integer> integers = Arrays.asList(1, 2, 3, 4, 5);
Integer sum = integers.stream()
  .reduce(0, Integer::sum);