public class SwapTester
{
   /**
      Swaps two values
      @param array an array of length 2 containing the
      values to be swapped
   */
   public static void trueSwap(int[] array)
   {
      System.out.print(array[1]);
      System.out.print(" ");
      System.out.println(array[0]);
   }

   public static void main(String[] args)
   {
      int[] xy = new int[2];
      xy[0] = 3;
      xy[1] = 4;
      trueSwap(xy);
      System.out.println("Expected: 4 3");
   }
}