Iterative implementation of selection sort

/**
	 * Iterative implementation of selection sort
	 * 
	 * @param arr Array of ints to be sorted in nondecreasing order.
	 */
 public static void selectionSort(int[] arr)
 {
	  if(arr == null) throw new NullPointerException();
	  if(arr.length == 0) throw new IllegalArgumentException();
	  if(arr.length == 1) return;
	  
	  for (int i = 0; i < arr.length; i++)
	  {
		  int minimumIndex = i;
		  
		  for (int j = i; j < arr.length; j++)
		  {
			  if (arr[j] < arr[minimumIndex])
				  minimumIndex = j;
		  }
		  
		  int temp = arr[i];
		  arr[i] = arr[minimumIndex];
		  arr[minimumIndex] = temp;
	  }
 }