как изменить порядок GROUP BY в гистограмме?

    try this ...
first condition checks if both values are less than value in array.
second condition if value is less than small than smallest=element[i]
else secondSmallest=elements[i]..

        public static void main(String[] args) 
        {
            int[] elements  = {0 , 2 , 10 , 3, -3 }; 
            int smallest = elements[0];
            int secondSmallest = 0; 

              for (int i = 0; i < elements.Length; i++)
                {
                    if (elements[i]<smallest || elements[i]<secondSmallest )
                    {
                        if (elements[i] < smallest )
                        {
                            secondSmallest  = smallest ;
                            smallest = elements[i];

                        }
                        else
                        {
                            secondSmallest = elements[i];

                        }
                    }
                }

            System.out.println("The smallest element is: " + smallest + "\n"+  "The second smallest element is: " + secondSmallest);
        }