1 package com.wetalk.wbs.bas.util;
2
3 import java.io.Serializable;
4 import java.math.BigDecimal;
5 import java.math.RoundingMode;
6
7
12 public class DoubleUtil implements Serializable {
13 private static final long serialVersionUID = -3345205828566485102L;
14 // 預設除法運算精度
15 private static final Integer DEF_DIV_SCALE = 2;
16
17
24 public static Double add(Double value1, Double value2) {
25 BigDecimal b1 = new BigDecimal(Double.toString(value1));
26 BigDecimal b2 = new BigDecimal(Double.toString(value2));
27 return b1.add(b2).doubleValue();
28 }
29
30
37 public static double sub(Double value1, Double value2) {
38 BigDecimal b1 = new BigDecimal(Double.toString(value1));
39 BigDecimal b2 = new BigDecimal(Double.toString(value2));
40 return b1.subtract(b2).doubleValue();
41 }
42
43
50 public static Double mul(Double value1, Double value2) {
51 BigDecimal b1 = new BigDecimal(Double.toString(value1));
52 BigDecimal b2 = new BigDecimal(Double.toString(value2));
53 return b1.multiply(b2).doubleValue();
54 }
55
56
63 public static Double divide(Double dividend, Double divisor) {
64 return divide(dividend, divisor, DEF_DIV_SCALE);
65 }
66
67
75 public static Double divide(Double dividend, Double divisor, Integer scale) {
76 if (scale < 0) {
77 throw new IllegalArgumentException("The scale must be a positive integer or zero");
78 }
79 BigDecimal b1 = new BigDecimal(Double.toString(dividend));
80 BigDecimal b2 = new BigDecimal(Double.toString(divisor));
81 return b1.divide(b2, scale,RoundingMode.HALF_UP).doubleValue();
82 }
83
84
91 public static double round(double value,int scale){
92 if(scale<0){
93 throw new IllegalArgumentException("The scale must be a positive integer or zero");
94 }
95 BigDecimal b = new BigDecimal(Double.toString(value));
96 BigDecimal one = new BigDecimal("1");
97 return b.divide(one,scale, RoundingMode.HALF_UP).doubleValue();
98 }
99 }