public String getOrderNumber() { String orderNumber = ""; String currentDate = DateUtil.getCurrentDate(); Condition condition=new Condition(TbDutyInspectClass.class); condition.createCriteria().andCondition("is_delete=0 ").andCondition("to_char(CREATE_DATE,'yyyy-MM-dd')='" + currentDate + "'"); condition.setOrderByClause("id desc"); List<TbDutyInspectClass> list = mapper.selectByExample(condition); if(list.isEmpty()){ orderNumber = currentDate.replaceAll("-","") + "01"; }else { orderNumber = currentDate.replaceAll("-","") + (list.size()+1); } return orderNumber; }怎么将自增数补成两位数

可以使用 String.format() 方法将自增数格式化成两位数的字符串，例如：

orderNumber = currentDate.replaceAll("-","") + String.format("%02d", list.size()+1);

这里使用了 %02d，表示格式化为两位数的十进制整数，不足两位时前面补0。