public class Swapper
{
   /**
      This method swaps the first and second half of the given array.
      @param values an array
   */
   public void swapFirstAndSecondHalf(int[] values)
   {
      int i = (values.length % 2 == 0) ? values.length / 2 : values.length / 2 + 1;
      for(int j = 0; j < ((values.length % 2 == 0) ? values.length / 2 : values.length / 2); j++)
      {
         swap(values, j, i);
         i++;
      }
   }

   public void swap(int[] values, int first, int second)
   {
      int temp = values[first];
      values[first] = values[second];
      values[second] = temp;
   }


   // This method is used to check your work
   public int[] check(int[] values)
   {
      swapFirstAndSecondHalf(values);
      return values;
   }
}