Java BigDecimal工具类

1. package com.barneyx.string;
   
2. 
   
3. import java.math.BigDecimal;
   
4. 
   
5. /**
   
6.  * Created by Administrator on 2017/2/12.
   
7.  */
   
8. public class Arith {
   
9.     //默认除法运算精精度
   
10.     private static final int DEF_DIV_SCALE = 10;
    
11. 
    
12.     private Arith(){}
    
13.     //提供加法运算
    
14.     public static double add(double v1,double v2){
    
15.         BigDecimal b1 = BigDecimal.valueOf(v1);
    
16.         BigDecimal b2 = BigDecimal.valueOf(v2);
    
17.         return b1.add(b2).doubleValue();
    
18.     }
    
19.     //提供减法运算
    
20.     public static double sub(double v1,double v2){
    
21.         BigDecimal b1 = BigDecimal.valueOf(v1);
    
22.         BigDecimal b2 = BigDecimal.valueOf(v2);
    
23.         return b1.subtract(b2).doubleValue();
    
24.     }
    
25.     //提供乘法运算
    
26.     public static double mul(double v1,double v2){
    
27.         BigDecimal b1 = BigDecimal.valueOf(v1);
    
28.         BigDecimal b2 = BigDecimal.valueOf(v2);
    
29.         return b1.multiply(b2).doubleValue();
    
30.     }
    
31.     //提供除法运算
    
32.     public static double div(double v1,double v2){
    
33.         BigDecimal b1 = BigDecimal.valueOf(v1);
    
34.         BigDecimal b2 = BigDecimal.valueOf(v2);
    
35.         return b1.divide(b2).doubleValue();
    
36.     }
    
37. 
    
38.     public static void main(String[] args) {
    
39.         System.out.println("0.05 + 0.01="+Arith.add(0.05,0.01));
    
40.         System.out.println("1.0-0.42="+Arith.sub(1.0,0.42));
    
41.         System.out.println("4.015*100="+Arith.mul(4.015,100));
    
42.         System.out.println("123.3/100="+Arith.div(123.3,100));
    
43. 
    
44.     }
    
45. 
    
46. }