summaryStatistics Method of IntSummaryStatistics

Question

Why summaryStatistics() method on an empty IntStream returns max and min value of integer as the maximum and minimum int value present in the stream?

IntStream          


        

Answer 1

To find a minimum int value in any array you typically initialize the default to Integer.MAX_VALUE.

int min = Integer.MAX_VALUE;

for (int i : somearray) {
   if (i < min) {
     min = i;
   }
}

return min;  

So if there was nothing to iterate, the value of the default min would be returned. For max, the default max is initialized to Integer.MIN_VALUE.