1、 ROUND_UP:远离零方向舍入。向绝对值最大的方向舍入,只要舍弃位非0即进位。 2、 ROUND_DOWN:趋向零方向舍入。向绝对值最小的方向输入,所有的位都要舍弃,不存在进位情况。 3、 ROUND_CEILING:向正无穷方向舍入。向正最大方向靠拢。若是正数,舍入行为类似于ROUND_UP,若为负数,舍入行为类似于ROUND_DOWN。Math.ro
@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...
一: 四舍五入(四舍五入形式保留两位小数,注意模式ROUND_HALF_UP) double f = 2345.2345; BigDecimal b = new BigDecimal(f); double f1 = b.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue(); 保留两位小数 二: double f = 2345.2345; java.text.DecimalFormat df =new java.text.DecimalFormat(“#...
ROUND_FLOOR:向负无穷大的方向舍入,即对正数进行向下舍入,对负数进行向上舍入。 ROUND_HALF_UP:最常见的四舍五入模式,若舍弃部分大于等于0.5,则进位;若舍弃部分小于0.5,则舍弃。 ROUND_HALF_DOWN:与ROUND_HALF_UP类似,但是当舍弃部分等于0.5时,向零的方向舍弃。
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); ...
RoundOptions Attributes RegisterAttribute Remarks Rounding mode to round away from zero. Always increments the digit prior to a nonzero discarded fraction. Note that this rounding mode never decreases the magnitude of the calculated value. This member is deprecated. UseRoundingMode#UPinstead. ...
Rounding mode to round towards negative infinity. If the BigDecimal is positive, behave as for ROUND_DOWN; if negative, behave as for ROUND_UP. Note that this rounding mode never increases the calculated value. This member is deprecated. Use RoundingMode#FLOOR instead. Java documentation for jav...
BigDecimal bd = new BigDecimal(1.234); //这个方法中划线,已经过时了 double result1 = bd.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue(); //可以用下面的代替 double resu
The java:module namespace is used to look up local enterprise beans within the same module. JNDI addresses using the java:module namespace are of the following form: java:module/enterprise bean name/[interface name] The interface name is required only if the enterprise bean implements more than...
This post will discuss how to round up a double with 2 decimal places in Java... The Math.round() method returns the value of the specified double rounded to the nearest long value.