code: public static String printInt2D(int[][] contab) {
          String line = "";
          for (int f = 0; f < contab.length; f++) {
              for (int g = 0; g < contab.length; g++) {
                  line += contab[f][g] + " ";
              }
              line += "\n";
          }
          return line;
      }
docs: Returns a string representation of a 2D int matrix for printing or listing to the console.
  
  @param  contab  The 2D int matrix for which a string representation is to be generatred