String轉(zhuǎn)BigDecimal

String a = "50.00";? //字符串類型，必須是數(shù)字，否則會(huì)報(bào)錯(cuò)， java.lang.NumberFormatException 異常 BigDecimal b =new BigDecimal(a);

BigDecimal加法運(yùn)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減法運(yùn)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乘法運(yùn)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

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BigDecimal planeTax=new BigDecimal(bookInfo.getPlaneTax());//string數(shù)據(jù)轉(zhuǎn)換BigDecimalBigDecimal yq=new BigDecimal(bookInfo.getYq());//string數(shù)據(jù)轉(zhuǎn)換BigDecimalBigDecimal publishPrice =? new BigDecimal(cabinInfo.getPublishPrice());//string數(shù)據(jù)轉(zhuǎn)換BigDecimal//進(jìn)行相加再相乘操作時(shí)注意不要直接用符號(hào)+、-、*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);

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總結(jié)

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