@Test public void givenInput_whenRound_thenRoundUpToTheNearestHundred() { assertEquals("Rounded up to hundred", 100, RoundUpToHundred.round(99)); assertEquals("Rounded up to three hundred ", 300, RoundUpToHundred.round(200.2)); assertEquals("Returns same rounded value", 400, RoundUpToHundred.r...
向负无穷方向舍入 ROUND_HALF_DOWN Rounding mode to round towards "nearest neighbor" unless both neighbors are equidistant, in which case round down. 向(距离)最近的一边舍入,除非两边(的距离)是相等,如果是这样,向下舍入, 例如1.55 保留一位小数结果为1.5 ROUND_HALF_EVEN Rounding mode to round towards...
public class Rounding { public static void main(String[] args) { double number = 3.14159; double roundedNumber = roundToNearest(number, 0.05); System.out.println("原始数字: " + number); System.out.println("舍入后的数字: " + roundedNumber); } public static double roundToNearest(double va...
还有一种方式是使用java.text.DecimalFormat,但也存在问题,format采用的舍入模式是ROUND_HALF_DOWN(舍入模式在下面有介绍),比如说4.025保留两位小数会是4.02,因为.025距离”nearest neighbor”(.02和.03)长度是相等,向下舍入就是.02,如果是4.0251那么保留两位小数就是4.03。 System.out.println(new java.text.Decima...
4.015 * 100 = 401.49999999999994 因此如果我们要做到精确的四舍五入,这种方法不能满足我们的要求。 还有一种方式是使用java.text.DecimalFormat,但也存在问题,format采用的舍入模式是ROUND_HALF_DOWN(舍入模式在下面有介绍),比如说4.025保留两位小数会是4.02,因为.025距离” nearest neighbor”(.02和.03)长度是相等...
4.015 * 100 = 401.49999999999994 因此如果我们要做到精确的四舍五入,这种方法不能满足我们的要求。 还有一种方式是使用java.text.DecimalFormat,但也存在问题,format采用的舍入模式是ROUND_HALF_DOWN(舍入模式在下面有介绍),比如说4.025保留两位小数会是4.02,因为.025距离”nearest neighbor”(.02和.03)长度是相等...
Ceiling 2 Rounding mode to round towards positive infinity. Floor 3 Rounding mode to round towards negative infinity. HalfUp 4 Rounding mode where values are rounded towards the nearest neighbor. Ties are broken by rounding up. HalfDown 5 Rounding mode where values are rounded towards the nearest...
Rounding mode to round towards the "nearest neighbor" unless both neighbors are equidistant, in which case, round towards the even neighbor. RoundHalfUp Rounding mode to round towards "nearest neighbor" unless both neighbors are equidistant, in which case round up. RoundUnnecessary Rounding mode...
round(MathContext mc) Returns a BigDecimal rounded according to the MathContext settings. int scale() Returns the scale of this BigDecimal. BigDecimal scaleByPowerOfTen(int n) Returns a BigDecimal whose numerical value is equal to (this * 10n). BigDecimal setScale(int newScale) Returns a BigDe...
rounded to one digit with HALF_UP rounding 5.5 6 2.5 3 1.6 2 1.1 1 1.0 1 -1.0 -1 -1.1 -1 -1.6 -2 -2.5 -3 -5.5 -6 HALF_DOWN public static final RoundingMode HALF_DOWN Rounding mode to round towards "nearest neighbor" unless both neighbors are equidistant, in which case round ...