Question

I’m trying to sort an array in descending order in Java using this code:

for(int i = 0; i < arr.length; i++) {
   Comparator comparator = Collections.reverseOrder();
   Arrays.sort(arr,comparator);
}

But I get this error:

The method sort(int[]) in the type Arrays is not applicable for the arguments (int[], Comparator)

Answer 1

It’s not clear why you’re trying to loop, but the Arrays.sort methods operating on primitive arrays don’t allow a custom comparator to be specified.

The simplest approach would be to sort and then reverse the array. I can’t immediately find a reverse method which would take an int[] but it would be easy to write your own.