方法2:用DecimalFormat 返回的是String格式的.该类对十进制进行全面的封装.像%号,千分位,小数精度.科学计算. float price=1.2; DecimalFormat decimalFormat=new DecimalFormat("0.00");//构造方法的字符格式这里如果小数不足2位,会以0补足. String p=decimalFomat.format(price);//format 返回的是字符串 1. 2. ...
Decimals, because the arithmetic isn't hard-wired into the CPU, are slower than floats, but they are ideal for anything that involves decimal numbers and needs those numbers to be exact, with rounding occurring in well-defined spots - financial calculations, scoreboards, etc. Some programming ...
static MathContext DECIMAL128 其精度设置与 IEEE 754R Decimal128 格式(即 34 个数字)匹配 舍入模式为 HALF_EVEN 这是 IEEE 754R 的默认舍入模式 static MathContext DECIMAL32 其精度设置与 IEEE 754R Decimal32 格式(即 7 个数字)匹配 舍入模式为 HALF_EVEN 这是 IEEE 754R 的默认舍入模式 static Mat...
BigDecimal setScale1= decimal.setScale(4,BigDecimal.ROUND_HALF_UP); System.out.println(setScale1); } 参数定义 ROUND_CEILING Rounding mode to round towards positive infinity. 向正无穷方向舍入 ROUND_DOWN Rounding mode to round towards zero. 向零方向舍入 ROUND_FLOOR Rounding mode to round towa...
4. RoundingDoubles WithBigDecimal To rounddoubles tondecimal places, we can write ahelper method: private static double round(double value, int places) { if (places < 0) throw new IllegalArgumentException(); BigDecimal bd = new BigDecimal(Double.toString(value)); ...
JSR-354 定义了4个相关包: (图2-1 包结构图) javax.money包含主要组件如: CurrencyUnit; MonetaryAmount; MonetaryContext; MonetaryOperator; MonetaryQuery; MonetaryRounding ; 相关的单例访问者Monetary。 javax.money.convert包含货币兑换相关组件如:
I've searched the archive and found a few different posts regarding restricting the number of decimal places in doubles. However they all suggest different methods, BigDecimal, NumberFormat etc. Which is the simplest method of rounding a number say 10.023445656 to 10.02? Thanks Mike Gershman Ranch...
0.54/4(=0.135)保留两位小数(HALF_EVEN) = 0.14 1/8(=0.125)保留两位小数(HALF_EVEN) = -0.12 Exception in thread "main" java.lang.ArithmeticException: Rounding necessary 3.5 值转换 public class BigDecimalDemo { public static void main(String[] args) { ...
Each rounding mode description includes a table listing how different two-digit decimal values would round to a one digit decimal value under the rounding mode in question. The result column in the tables could be gotten by creating aBigDecimalnumber with the specified value, forming a...
That’s all about rounding double/float to 2 decimal places Was this post helpful? Let us know if this post was helpful. Feedbacks are monitored on daily basis. Please do provide feedback as that\'s the only way to improve. Yes No Related posts: Java Math ceil example Java Math flo...