code: @Override
      HijrahDate plusYears(long years) {
          if (years == 0) {
              return this;
          }
          int newYear = Jdk8Methods.safeAdd(this.yearOfEra, (int)years);
          return HijrahDate.of(this.era, newYear, this.monthOfYear, this.dayOfMonth);
      }
docs: -----------------------------------------------------------------------