package?com.niki.pay;

import?java.io.Serializable;
import?java.math.BigDecimal;
import?java.math.RoundingMode;

/*
*?@author?choi.split
*?@date??2017/11/17?0017
*?@desc??
*/
public?class?DoubleUtil?implements?Serializable?{
????private?static?final?long?serialVersionUID?=?-3345205828566485102L;
????//?默認除法運算精度
????private?static?final?Integer?DEF_DIV_SCALE?=?2;

????/**
?????*?提供精確的加法運算。
?????*
?????*?@param?value1?被加數
?????*?@param?value2?加數
?????*?@return?兩個參數的和
?????*/
????public?static?Double?add（Double?value1?Double?value2）?{
????????BigDecimal?b1?=?new?BigDecimal（Double.toString（value1））;
????????BigDecimal?b2?=?new?BigDecimal（Double.toString（value2））;
????????return?b1.add（b2）.doubleValue（）;
????}

????/**
?????*?提供精確的減法運算。
?????*
?????*?@param?value1?被減數
?????*?@param?value2?減數
?????*?@return?兩個參數的差
?????*/
????public?static?double?sub（Double?value1?Double?value2）?{
????????BigDecimal?b1?=?new?BigDecimal（Double.toString（value1））;
????????BigDecimal?b2?=?new?BigDecimal（Double.toString（value2））;
????????return?b1.subtract（b2）.doubleValue（）;
????}

????/**
?????*?提供精確的乘法運算。
?????*
?????*?@param?value1?被乘數
?????*?@param?value2?乘數
?????*?@return?兩個參數的積
?????*/
????public?static?Double?mul（Double?value1?Double?value2）?{
????????BigDecimal?b1?=?new?BigDecimal（Double.toString（value1））;
????????BigDecimal?b2?=?new?BigDecimal（Double.toString（value2））;
????????return?b1.multiply（b2）.doubleValue（）;
????}

????/**
?????*?提供（相對）精確的除法運算，當發生除不盡的情況時，?精確到小數點以后10位，以后的數字四舍五入。
?????*
?????*?@param?dividend?被除數
?????*?@param?divisor??除數
?????*?@return?兩個參數的商
?????*/
????public?static?Double?divide（Double?dividend?Double?divisor）?{
????????return?divide（dividend?divisor?DEF_DIV_SCALE）;
????}

????/**
?????*?提供（相對）精確的除法運算。?當發生除不盡的情況時，由scale參數指定精度，以后的數字四舍五入。
?????*
?????*?@param?dividend?被除數
?????*?@param?divisor??除數
?????*?@param?scale????表示表示需要精確到小數點以后幾位。
?????*?@return?兩個參數的商
?????*/
????public?static?Double?divide（Double?dividend?Double?divisor?Integer?scale）?{
????????if?（scale?????????????throw?new?IllegalArgumentException（“The?scale?must?be?a?positive?integer?or?zero“）;
????????}
????????BigDecimal?b1?=?new?BigDecimal（Double.toString（dividend））;
????????BigDecimal?b2?=?new?BigDecimal（Double.toString（divisor））;
????????return?b1.divide（b2?scaleRoundingMode.HALF_UP）.doubleValue（）;
????}

????/**
?????*?提供指定數值的（精確）小數位四舍五入處理。
?????*
?????*?@param?value?需要四舍五入的數字
?????*?@param?scale?小數點后保留幾位
?????*?@return?四舍五入后的結果
?????*/
????public?static?double?round（double?valueint?scale）{
????????if（scale<0）{
????????????throw?new?IllegalArgumentException（“The?scale?must?be?a?positive?integer?or?zero“）;
????????}
????????BigDecimal?b?=?new?BigDecimal（Double.toString（value））;
????????BigDecimal?one?=?new?BigDecimal（“1“）;
????????return?b.divide（onescale?RoundingMode.HALF_UP）.doubleValue（）;
????}
}

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件?????????341??2017-11-17?09:56??.project
?????文件?????????514??2017-11-17?09:56??pay.eml
?????文件????????1203??2017-12-05?13:40??pay.iml
?????文件?????????388??2017-11-17?09:56??pay.userlibraries
?????文件????????1530??2017-12-05?13:39??pom.xml
?????目錄???????????0??2017-12-05?13:40??.idea\
?????文件?????????618??2017-11-17?14:16??.idea\compiler.xml
?????文件?????????197??2017-11-17?09:55??.idea\encodings.xml
?????目錄???????????0??2017-11-17?09:55??.idea\inspectionProfiles\
?????目錄???????????0??2017-12-05?13:40??.idea\libraries\
?????文件?????????503??2017-11-17?11:09??.idea\libraries\Maven__commons_io_commons_io_2_6.xml
?????文件?????????514??2017-11-17?10:13??.idea\libraries\Maven__com_alibaba_fastjson_1_2_40.xml
?????文件?????????492??2017-11-17?09:55??.idea\libraries\Maven__net_java_dev_jna_jna_4_5_0.xml
?????文件?????????555??2017-11-17?09:55??.idea\libraries\Maven__net_java_dev_jna_jna_platform_4_5_0.xml
?????文件?????????565??2017-11-18?17:18??.idea\misc.xml
?????文件?????????246??2017-11-17?09:53??.idea\modules.xml
?????文件????????8792??2017-12-05?13:40??.idea\uiDesigner.xml
?????文件???????53092??2017-12-05?13:40??.idea\workspace.xml
?????目錄???????????0??2017-11-17?09:53??src\
?????目錄???????????0??2017-11-17?09:53??src\main\
?????目錄???????????0??2017-11-17?09:53??src\main\java\
?????目錄???????????0??2017-12-05?13:38??src\main\java\com\
?????目錄???????????0??2017-12-05?13:38??src\main\java\com\niki\
?????目錄???????????0??2017-12-05?13:40??src\main\java\com\niki\pay\
?????目錄???????????0??2017-12-05?13:40??src\main\java\com\niki\pay\doamain\
?????文件?????????792??2017-12-05?13:40??src\main\java\com\niki\pay\doamain\AppType.java
?????文件????????6913??2017-12-05?13:40??src\main\java\com\niki\pay\doamain\PayBean.java
?????文件????????3085??2017-12-05?13:40??src\main\java\com\niki\pay\doamain\PayEntity.java
?????文件????????1799??2017-12-05?13:40??src\main\java\com\niki\pay\doamain\TransType.java
?????文件????????3429??2017-12-05?13:40??src\main\java\com\niki\pay\DoubleUtil.java
?????文件????????2123??2017-12-05?13:40??src\main\java\com\niki\pay\EncryptUtil.java
............此處省略16個文件信息