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  • bigdecimal 保留小数位

    2019-01-10 16:45:20
    bigdecimal 保留小数位 public class test1_format { public static void main(String[] args) { BigDecimal decimal = new BigDecimal("1.12345"); System.out.println(decimal); BigD...

    bigdecimal 保留小数位

    public class test1_format {
    
        public static void main(String[] args) {
            BigDecimal decimal = new BigDecimal("1.12345");
            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);
        }
    }

     

    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

     

    展开全文
  • Bigdecimal 保留小数位

    千次阅读 2018-07-20 17:01:14
    Bigdecimal 保留小数位       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...

    Bigdecimal 保留小数位

        

        

     

       

    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

     

    展开全文
  • bigdecimal保留小数位

    千次阅读 2018-08-24 16:14:54
    bigdecimal保留小数位 ROUND_DOWN:直接去掉多余的位数 ROUND_UP:进位处理,与四舍五入相比,指定位数的后一位数无论是多少,都会进位 ROUND_CEILING:天花板(向上),正数进位向上,负数舍位向上 ROUND_FLOOR:...

    bigdecimal保留小数位

    • ROUND_DOWN:直接去掉多余的位数
    • ROUND_UP:进位处理,与四舍五入相比,指定位数的后一位数无论是多少,都会进位
    • ROUND_CEILING:天花板(向上),正数进位向上,负数舍位向上
    • ROUND_FLOOR:地板(向下),正数舍位向下,负数进位向下
    • ROUND_HALF_UP:四舍五入(舍弃部分需要>.4,才会进位)
    • ROUND_HALF_DOWN:四舍五入(舍弃部分需要>.5,才会进位)
            BigDecimal bigDecimal1 = new BigDecimal(1.2345);
            System.out.println(bigDecimal1.setScale(3, BigDecimal.ROUND_HALF_UP));//1.234
            BigDecimal bigDecimal2 = new BigDecimal(1.2346);
            System.out.println(bigDecimal2.setScale(3, BigDecimal.ROUND_HALF_UP));//1.235
            BigDecimal bigDecimal3 = new BigDecimal("1.2345");
            System.out.println(bigDecimal3.setScale(3, BigDecimal.ROUND_HALF_UP));//1.235
            BigDecimal bigDecimal4 = new BigDecimal("1.2345");
            System.out.println(bigDecimal4.setScale(3, BigDecimal.ROUND_HALF_DOWN));//1.234

    原因:
    使用参数为float或double的BigDecimal创建对象会丢失精度。建议不要使用参数为float或double的BigDecimal创建对象。而是采用string字符串来创建对象

    展开全文
  • bigdecimal 保留小数位.pdf
  • BigDecimal 保留小数位

    2021-09-18 15:44:13
    Bigdecimal记录 BigDecimal decimal = new BigDecimal("1.55"); BigDecimal round_ceiling = decimal.setScale(1,BigDecimal.ROUND_CEILING); System.out.println("round_ceiling = " + round_ceiling + "\n"); ...

    Bigdecimal记录

        BigDecimal decimal = new BigDecimal("1.55");
    
        BigDecimal round_ceiling = decimal.setScale(1,BigDecimal.ROUND_CEILING);
        System.out.println("round_ceiling = " +  round_ceiling + "\n");
    
        BigDecimal round_down = decimal.setScale(1,BigDecimal.ROUND_DOWN);
        System.out.println("round_down = " + round_down + "\n");
    
        BigDecimal round_floor = decimal.setScale(1,BigDecimal.ROUND_FLOOR);
        System.out.println("round_floor = " + round_floor + "\n");
    
        BigDecimal round_half_down = decimal.setScale(1,BigDecimal.ROUND_HALF_DOWN);
        System.out.println("round_half_down = " + round_half_down + "\n" );
    
        BigDecimal round_half_up = decimal.setScale(1,BigDecimal.ROUND_HALF_UP);
        System.out.println("round_half_up = " + round_half_up + "\n");
    
        BigDecimal round_half_even = decimal.setScale(1,BigDecimal.ROUND_HALF_EVEN);
        System.out.println("round_half_even = " + round_half_even + "\n" );
    
        BigDecimal round_unnecessary = decimal.setScale(2,BigDecimal.ROUND_UNNECESSARY);
        System.out.println("round_unnecessary = " + round_unnecessary + "\n" );
    
        BigDecimal round_up = decimal.setScale(1,BigDecimal.ROUND_UP);
        System.out.println("round_up = " + round_up + "\n" );
    

    打印结果:

    round_ceiling = 1.6
    
    round_down = 1.5
    
    round_floor = 1.5
    
    round_half_down = 1.5
    
    round_half_up = 1.6
    
    round_half_even = 1.6
    
    round_unnecessary = 1.55
    
    round_up = 1.6
    

    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

    展开全文
  • BigDecimal保留小数位

    千次阅读 2017-10-25 20:45:56
    package com.algorithms;import java.math.BigDecimal; import java.util.Scanner;/** * 调和级数求和 * @author LYY * */ public class TiaoHeJiShuTest { public static void main(String[] args) { System
  • Bigdecimal保留小数位

    千次阅读 2016-11-10 15:21:35
    这里Bigdecimal保留小数主要用到的方法是: BigDecimal a = a=new BigDecimal("180.055555456456465"); BigDecimal setScale = a.setScale(int newScale, int roundingMode)其中setScale()方法中,关于小数点,JDK给...
  • BigDecimal decimal = new BigDecimal("1.98764432"); System.out.println(decimal); BigDecimal setScale = decimal.setScale(4,BigDecimal.ROUND_HALF_DOWN); System.out.println(setScale); BigDecimal ...
  • 关于BigDecimal保留小数位

    千次阅读 2013-05-24 17:35:51
    方法一: BigDecimal b1 = new BigDecimal...说明:scale=3,也就是说保留位小数。如果b=156,156.5或156.55,其结果分别是 156.0,156.5和156.55。也就是说,保留的位数不能统一,看要求使用。   方法二: Do
  • 如何给bigdecimal保留小数位

    千次阅读 2017-10-27 17:02:45
    public class test1_format {  public static void main(String[] args) {  BigDecimal decimal = new BigDecimal("1.12345");  System.out.println(decimal);  BigDecimal setScale
  • 原文地址:https://www.cnblogs.com/liqforstudy/p/5652517.html public class test1_format { public static void main(String[] args) { ... BigDecimal decimal = new BigDecimal("1.12345"); ...

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