How to check if array is already sorted

Question

so how to make such logic

int[] arr = {2, 5, 3};

if (/* arr is sorted */)
    ....
else 
    ...

Its bad that method Array.sort is void

Answer 1

public static 
boolean isArraySorted(T[] elements, Comparator cmp) {
  int n = elements.length;
  for (int i = 1; i < n; ++i) {
    if (cmp.compare(elements[i-1], elements[i]) > 0) { return false; }
  }
  return true;
}