importjava.math.BigDecimal;publicclassTwoDecimalPlaces{publicstaticvoidmain(String[]args){BigDecimalnumber=newBigDecimal("123.456");// 输入一个小数// 设置小数位数为两位BigDecimalroundedNumber=number.setScale(2,BigDecimal.ROUND_HALF_UP);System.out.println("原始数字: "+number);System.out.println("保留...
} BigDecimal方法会根据数字的具体精度位数,来判断是否需要使用科学计数法。 验证代码 publicstaticvoidmain(String[] args){BigDecimaldecimal=newBigDecimal("0.00000000000009");DecimalFormatdecimalFormatNumberOfDecimalPlaces2=(DecimalFormat) NumberFormat.getNumberInstance(Locale.CHINA); decimalFormatNumberOfDecimalPlaces2....
在这里,我们创建一个BigDecimalUtil类,专门用于高精度数值的字符串转换和格式化。 4.1 类图 BigDecimalUtil+BigDecimal number+String toString()+String formatToTwoDecimalPlaces()+String formatWithPattern(String pattern) 4.2 类实现 以下是BigDecimalUtil类的实现示例: importjava.math.BigDecimal;importjava.text.Decima...
public static BigDecimal calculateTotalAmount(BigDecimal quantity, BigDecimal unitPrice, BigDecimal discountRate, BigDecimal taxRate) { BigDecimal amount = quantity.multiply(unitPrice); BigDecimal discountedAmount = amount.multiply(BigDecimal.ONE.subtract(discountRate)); BigDecimal total=< discountedAmount.multi...
By using the DecimalFormat, we can have better control of the output's rounding behavior compared to the String.format() method that was previously utilized. 4. RoundingDoubles WithBigDecimal We can create a supporting function to convert double values into n decimal places instead of rounding the...
使用BigDecimal 类,它可以对任意精度的数值进行精确的运算。我们可以使用 setScale () 方法来设置保留的小数位数和舍入模式。例如: doublenum=3.14159;BigDecimalbd=newBigDecimal(Double.toString (num)); bd = bd.setScale (1, RoundingMode.HALF_UP);doubleresult=bd.doubleValue ();// result = 3.1 ...
1. UsingBigDecimalClass UsingBigDecimalclass is the recommended approachfor doing numerical operations in Java.BigDecimalis animmutableclass and provides operations for arithmetic, scale manipulation, rounding, comparison, hashing, and format conversion. ...
You want to try String.format("%f", d), which will print your double in decimal notation. Don't use BigDecimal at all. Regarding the precision issue: You are first storing 47.48 in the double c, then making a new BigDecimal from that double. The loss of precision is in assigning to ...
The BigDecimal class provides operations for arithmetic, scale manipulation, rounding, comparison, hashing, and format conversion. The toString() method provides a canonical representation of a BigDecimal. The BigDecimal class gives its user complete control over rounding behavior. If no rounding mode ...
We’ll start with a new instance ofBigDecimalwith our original decimal value. Then,by setting the scale, we’ll provide the number of decimal places we want, and how we want to round our number. Using this method allows us to easily format adoublevalue: ...