Java代码优化：简化获取和计算数量

double purchaseQuantity = vo.getPurchaseQuantity() != null ? vo.getPurchaseQuantity() : 0; \u000ddouble cucurrentIncompleteQuantity = purchaseQuantity - vo.getCurrentPeriodQuantity(); \u000dvo.setCucurrentIncompleteQuantity(cucurrentIncompleteQuantity); \u000dvo.setCucurrentIncompletePercentage(decimalFormat.format(cucurrentIncompleteQuantity / vo.getCurrentPeriodQuantity()));