Java BigDecimal工具类

package com.barneyx.string;

import java.math.BigDecimal;

/**
 * Created by Administrator on 2017/2/12.
 */
public class Arith {
    //默认除法运算精精度
    private static final int DEF_DIV_SCALE = 10;

    private Arith(){}
    //提供加法运算
    public static double add(double v1,double v2){
        BigDecimal b1 = BigDecimal.valueOf(v1);
        BigDecimal b2 = BigDecimal.valueOf(v2);
        return b1.add(b2).doubleValue();
    }
    //提供减法运算
    public static double sub(double v1,double v2){
        BigDecimal b1 = BigDecimal.valueOf(v1);
        BigDecimal b2 = BigDecimal.valueOf(v2);
        return b1.subtract(b2).doubleValue();
    }
    //提供乘法运算
    public static double mul(double v1,double v2){
        BigDecimal b1 = BigDecimal.valueOf(v1);
        BigDecimal b2 = BigDecimal.valueOf(v2);
        return b1.multiply(b2).doubleValue();
    }
    //提供除法运算
    public static double div(double v1,double v2){
        BigDecimal b1 = BigDecimal.valueOf(v1);
        BigDecimal b2 = BigDecimal.valueOf(v2);
        return b1.divide(b2).doubleValue();
    }

    public static void main(String[] args) {
        System.out.println("0.05 + 0.01="+Arith.add(0.05,0.01));
        System.out.println("1.0-0.42="+Arith.sub(1.0,0.42));
        System.out.println("4.015*100="+Arith.mul(4.015,100));
        System.out.println("123.3/100="+Arith.div(123.3,100));

    }

}