code: private void printMaxMin() {
          int min = 255;
          int max = 0;
          for (int i = 0; i < mtxTab.length; i++) {
              if (mtxTab[i].getIndex() < min) {
                  min = mtxTab[i].getIndex();
              }
              if (mtxTab[i].getIndex() > max) {
                  max = mtxTab[i].getIndex();
              }
          }
          log.info("Min: " + min);
          log.info("Max: " + max);
      }
docs: Print first char/last char