String转BigDecimal，BigDecimal常用操作，以及避免踩坑

String转BigDecimal String a = "50.00";  //字符串类型，必须是数字，否则会报错， java.lang.NumberFormatException 异常 BigDecimal b =new BigDecimal(a); BigDecimal加法运算 BigDecimal planeTax=new BigDecimal(bookInfo.getPlaneTax()); BigDecimal yq=new BigDecimal(bookInfo.getYq()); BigDecimal publishPrice =  new BigDecimal(cabinInfo.getPublishPrice()); totalPrice =publishPrice.add(planeTax).add(yq); BigDecimal减法运算 BigDecimal planeTax=new BigDecimal(bookInfo.getPlaneTax()); BigDecimal yq=new BigDecimal(bookInfo.getYq()); BigDecimal publishPrice =  new BigDecimal(cabinInfo.getPublishPrice()); totalPrice =publishPrice.subtract(planeTax).subtract(yq); BigDecimal乘法运算 BigDecimal planeTax=new BigDecimal(bookInfo.getPlaneTax()); BigDecimal yq=new BigDecimal(bookInfo.getYq()); BigDecimal publishPrice =  new BigDecimal(cabinInfo.getPublishPrice()); totalPrice =publishPrice.multiply(planeTax).multiply(yq); BigDecimal避免踩坑 BigDecimal planeTax=new BigDecimal(bookInfo.getPlaneTax());//string数据转换BigDecimal   BigDecimal yq=new BigDecimal(bookInfo.getYq());//string数据转换BigDecimal   BigDecimal publishPrice =  new BigDecimal(cabinInfo.getPublishPrice());//string数据转换BigDecimal //进行相加再相乘操作时注意不要直接用符号+、-、*等，后面是四舍五入的格式   totalPrice =(publishPrice.add(planeTax).add(yq)).multiply( new BigDecimal(model.getBookInfoList().size()))   .setScale(2,     BigDecimal.ROUND_HALF_UP);    totalPrice = price.subtract(couponMoney); String转BigDecimal String a = "50.00";  //字符串类型，必须