/** Method to test getColTotal */
 public static void testGetColTotal() {
   IntArrayWorker worker = new IntArrayWorker();
   int[][] nums2 = {{1, 2, 3}, {4, 5, 6}};
   worker.setMatrix(nums2);
   int total = worker.getColTotal(0);
   System.out.println("Total for column 0 should be 5 and is " + total);
   total = worker.getColTotal(1);
   System.out.println("Total for column 1 should be 7 and is " + total);
   total = worker.getColTotal(2);
   System.out.println("Total for column 2 should be 9 and is " + total);
 }