bigdecimal

BigDecimal with smart precision (scale) [duplicate]

由 梦想与她 提交于 2020-07-31 04:50:08
问题 This question already has answers here : Removing trailing zeros from BigDecimal in Java (6 answers) Closed 2 years ago . How to set generic scaling according to decimal roundness as a number BigDecimal num = new BigDecimal(25) BigDecimal result = num.divide(new BigDecimal(13), 7, RoundingMode.HALF_EVEN) // 1.9230769 but BigDecimal result = num.divide(new BigDecimal(10), 7, RoundingMode.HALF_EVEN) // 2.5000000 that should be 2.5 Probably analyzing remainder? Is there something in the API for

java math library for BigDecimal which allows null values

由 China☆狼群 提交于 2020-07-04 22:01:06
问题 Is there a BigDecimal library with the basic operations of BigDecimal which allows null values? Null should be treated as 0 for mathematical purpose. I don't want to do all the null checks for possible null values. You either never allow null values in database, application or view and initialize everything with new BigDecimal(0) or perform null checks on every usage for nullable values. Something like: public static BigDecimal add(final BigDecimal value, final BigDecimal augend) { if (value

java math library for BigDecimal which allows null values

由 你离开我真会死。 提交于 2020-07-04 21:59:32
问题 Is there a BigDecimal library with the basic operations of BigDecimal which allows null values? Null should be treated as 0 for mathematical purpose. I don't want to do all the null checks for possible null values. You either never allow null values in database, application or view and initialize everything with new BigDecimal(0) or perform null checks on every usage for nullable values. Something like: public static BigDecimal add(final BigDecimal value, final BigDecimal augend) { if (value

java math library for BigDecimal which allows null values

由 百般思念 提交于 2020-07-04 21:57:29
问题 Is there a BigDecimal library with the basic operations of BigDecimal which allows null values? Null should be treated as 0 for mathematical purpose. I don't want to do all the null checks for possible null values. You either never allow null values in database, application or view and initialize everything with new BigDecimal(0) or perform null checks on every usage for nullable values. Something like: public static BigDecimal add(final BigDecimal value, final BigDecimal augend) { if (value

JUnit Assert with BigDecimal

由 人走茶凉 提交于 2020-06-09 09:19:13
问题 I want to use assert between 2 two decimal, I use this: BigDecimal bd1 = new BigDecimal (1000); BigDecimal bd2 = new BigDecimal (1000); org.junit.Assert.assertSame (bd1,bd2); but the JUnit log shows: expected <1000> was not: <1000> 回答1: assertSame tests that the two objects are the same objects, i.e. that they are == : Asserts that two objects refer to the same object. If they are not the same, an AssertionError without a message is thrown. In your case, since bd1 and bd2 are both new

Rounding Bigdecimal values with 2 Decimal Places

由 倾然丶 夕夏残阳落幕 提交于 2020-05-25 05:50:12
问题 I want a function to convert Bigdecimal 10.12 for 10.12345 and 10.13 for 10.12556 . But no function is satisfying both conversion in same time.Please help to achieve this. Below is what I tried. With value 10.12345: BigDecimal a = new BigDecimal("10.12345"); a.setScale(2, BigDecimal.ROUND_UP) a.setScale(2, BigDecimal.ROUND_CEILING) a.setScale(2, BigDecimal.ROUND_DOWN) a.setScale(2, BigDecimal.ROUND_FLOOR) a.setScale(2, BigDecimal.ROUND_HALF_DOWN) a.setScale(2, BigDecimal.ROUND_HALF_EVEN) a

Using BigDecimal to print Pi

由 痴心易碎 提交于 2020-05-15 09:55:07
问题 I'm tring to use BigDecimal to print Pi, but it turns out it's not accurate BigDecimal d = new BigDecimal(Math.PI); System.out.println(d); The above answer gives me "3.141592653589793115997963468544185161590576171875" but the digits after "3.141592653589793" is incorrect how this is happenning ? and can i use bigdecimal to print PI ? 回答1: From Javadoc for Math.PI: PI public static final double PI The double value that is closer than any other to pi, the ratio of the circumference of a circle

Java中BigDecimal的应用

由 安稳与你 提交于 2020-04-18 02:03:54
我们来看一看java中BigDecimal的用法 public class MathUtil { // 加法 public static Double add(double a,double b,int scal) throws Exception{ BigDecimal add1 = conversionToBigDecimal(a); BigDecimal add2 = conversionToBigDecimal(b); Double result = add1.add(add2).setScale(scal,BigDecimal.ROUND_HALF_UP).doubleValue(); return result; } // 减法 public static Double subtract(double a,double b,int scal) throws Exception{ BigDecimal subtract1 = conversionToBigDecimal(a); BigDecimal subtract2 = conversionToBigDecimal(b); Double result = subtract1.subtract(subtract2).setScale(scal,BigDecimal.ROUND_HALF_UP).doubleValue()

BigDecimal转String

由 谁都会走 提交于 2020-04-07 11:22:24
public static void main(String[] args) { // 浮点数的打印 System.out.println(new BigDecimal("10000000000").toString()); // 普通的数字字符串 System.out.println(new BigDecimal("100.000").toString()); // 去除末尾多余的0 System.out.println(new BigDecimal("100.000").stripTrailingZeros().toString()); // 避免输出科学计数法 System.out.println(new BigDecimal("100.000").stripTrailingZeros().toPlainString()); } 输出结果： 10000000000 100.000 1E+2 100 本文由博客一文多发平台 OpenWrite 发布！ 来源： https://www.cnblogs.com/JohnDawson/p/12651841.html

浮点数据精确计算之~BigDecimal

由 送分小仙女□ 提交于 2020-03-27 15:35:59
一、概述 在大多数情况下，浮点数类型float和double运算 会丢失精度 ，计算的结果是准确的，float和double只能用来做科学计算或者是工程计算，Java在商业计算中要用 java.math.BigDecimal 。 BigDecimal有多种构造函数，常用的有2种。 建议使用String构造方式 ，不建议使用double构造方式。 public BigDecimal(String val); public BigDecimal(double val); Bigdecimal常用方法： 加减乘除: add()、subtract()、multiply()、divide(). 注意： 使用BigDecimal类构造方法传入double类型时，计算的结果也是不精确的； 因为不是所有的浮点数都能够被精确的表示成一个double 类型值，因此它会被表示成与它最接近的 double 类型的值。必须改用传入String的构造方法。 舍入模式： ...... 二、使用 1. 使用BigDecimal计算 public class BigDecimalTest { public static void main(String[] args) { computed(); lossAccuracy(); } /** * 使用BigDecimal 计算 */ public static
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