大家好,又见面了,我是你们的朋友全栈君。如果您正在找激活码,请点击查看最新教程,关注关注公众号 “全栈程序员社区” 获取激活教程,可能之前旧版本教程已经失效.最新Idea2022.1教程亲测有效,一键激活。
Jetbrains全系列IDE使用 1年只要46元 售后保障 童叟无欺
BigDecimal decimal = new BigDecimal("1.98764432");
System.out.println(decimal);
BigDecimal setScale = decimal.setScale(4,BigDecimal.ROUND_HALF_DOWN);
System.out.println(setScale);
BigDecimal setScale1 = decimal.setScale(4,BigDecimal.ROUND_HALF_UP);
System.out.println(setScale1);
运行结果
1.98764432
1.9876
1.9877
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 towards negative infinity.
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 the “nearest neighbor” unless both neighbors are equidistant, in which case, round towards the even neighbor.
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,如果保留位数是奇数,使用ROUND_HALF_UP ,如果是偶数,使用ROUND_HALF_DOWN
ROUND_HALF_UP
Rounding mode to round towards “nearest neighbor” unless both neighbors are equidistant, in which case round up.
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,向上舍入, 1.55保留一位小数结果为1.6
ROUND_UNNECESSARY
Rounding mode to assert that the requested operation has an exact result, hence no rounding is necessary.
计算结果是精确的,不需要舍入模式
ROUND_UP
Rounding mode to round away from zero.
向远离0的方向舍入
发布者:全栈程序员-用户IM,转载请注明出处:https://javaforall.cn/193378.html原文链接:https://javaforall.cn
【正版授权,激活自己账号】: Jetbrains全家桶Ide使用,1年售后保障,每天仅需1毛
【官方授权 正版激活】: 官方授权 正版激活 支持Jetbrains家族下所有IDE 使用个人JB账号...