code: private void obtainQualityStringFromQualityScoresArray(int encoding) {
          char[] qualityChars = new char[this.qualityScoresArray.length];
          // add the scale offset to each individual score and transform the result to a char
          for (int i = 0; i < this.qualityScoresArray.length; i++) {
              qualityChars[i] = (char) (this.qualityScoresArray[i] + FastQ.SCALE_OFFSET[encoding]);
          }
          this.quality = new String(qualityChars);
      }
docs: Obtain the quality string in the indicated quality encoding, from the quality scores array
  
  @param encoding - quality encoding