public void setPopulation(String gender, String state, String population)
  {
    StateType st = _stateTypeList.get(state);
    
    if (population.equals("") || population == null) {
      return;
    } else {
      switch (GENDERS.valueOf(gender)) {
        case MALE:   st._male   = Integer.parseInt(population); break;
        case FEMALE: st._female = Integer.parseInt(population); break;
        case PERSON: st._person = Integer.parseInt(population); break;
      }
    }
  }