Java: Variable is already defined in method main

So I have been the following error every time I try to compile my .java file

"error: variable max is already defined in method main(String[]) int max = j; "

And I haven't been able to figure out what is the issue or how to fix it. Been stuck at it for about 2 hours now. What I'm trying to ultimately do is enter one integer into my array and sorting the digits in that integer from least to greatest to provide context.

Here is the relevant part from my code:

   int[] wholeNumber = new int[1];


   //Sorting algorithm beginning
   int n = wholeNumber.length;

   System.out.println("Length of array is :" + n); //Array length displayed

   for(int i = 0; i < 1; i++)
   {
     System.out.println("Hello!");

     int max = i;

     for(int j = i+1; j < 1; j++)
     {
       if (wholeNumber[j] > wholeNumber[max])
       {  
          int max = j;
       }

     }
     if (max != i)
     {
        wholeNumber[i] = wholeNumber[max];
        wholeNumber[max] = wholeNumber[i];
     }



   }
   //Sorting algorithm end