首先,我们定义了一个静态方法roundToTwoDecimalPlaces,该方法接受一个double类型的参数number,并返回保留两位小数四舍五入后的结果。 在roundToTwoDecimalPlaces方法中,我们使用了Math.round方法将number乘以100后进行四舍五入,并将结果除以100.0得到保留两位小数四舍五入后的结果。 然后,我们在main方法中定义了一个doubl...
我们可以使用BigDecimal类来保留两位小数。 importjava.math.BigDecimal;publicclassBigDecimalUtils{publicstaticdoubleroundToTwoDecimalPlaces(doublenumber){BigDecimalbd=newBigDecimal(number);BigDecimalrounded=bd.setScale(2,BigDecimal.ROUND_HALF_UP);returnrounded.doubleValue();}} 1. 2. 3. 4. 5. 6. 7. 8....
Learn toround off numeric values (floats and doubles) to 2 decimal places in Java. Note that we can use the given solutions to round off to any number of places according to requirements. Quick Reference doublenumber=4.56789; // 1. Using Math.round()doublerounded=Math.round(number*100.0)/...
import java.math.BigDecimal; public class BigDecimalExample { public static void main(String[] args) { double doubleValue = 123.456789; BigDecimal bigDecimalValue = BigDecimal.valueOf(doubleValue); BigDecimal roundedValue = bigDecimalValue.setScale(2, BigDecimal.ROUND_HALF_UP); System.out.println("...
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)); bd = bd.setScale(places, RoundingMode.HALF_UP); ...
使用Math.round () 方法,它可以对数值进行四舍五入,返回一个整数。如果要保留一位小数,我们可以先把数值乘以 10,然后再除以 10.0。例如: doublenum=3.14159;doubleresult=Math.round (num *10) /10.0;// result = 3.1 复制 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 (...
ROUND (number [,decimals ]) //四舍五入,decimals为小数位数] 注:返回类型并非均为整数,如: (1)默认变为整形值 select round(1.23); //打印输出1 select round(1.56); //打印输出2 (2)可以设定小数位数,返回浮点型数据 select round(1.567,2); //打印输出1.57 ...
Two types of operations are provided for manipulating the scale of a BigDecimal: scaling/rounding operations and decimal point motion operations. Scaling/rounding operations (setScale and round) return a BigDecimal whose value is approximately (or exactly) equal to that of the operand, but whose sc...
/** * @param scale 精确到小数点以后几位 (Accurate to a few decimal places) */ fun formatFileSize(size: Long, scale: Int, withUnit: Boolean = false): String { val divisor = 1024L //ROUND_DOWN 1023 -> 1023B ; ROUND_HALF_UP 1023 -> 1KB val kiloByte: BigDecimal = formatSizeBy...
Here’s an example code snippet that demonstrates how to multiply two numbers usingDecimalFormatand round the result to two decimal places: importjava.text.DecimalFormat;publicclassDecimalFormatExample{publicstaticvoidmain(String[]args){doublenum1=3.1415;doublenum2=2.7182;doubleresult=num1*num2;DecimalFor...