Java decimal calculation tool class without losing precision

1. Code

package com.xtm.java.test;

import java.math.BigDecimal;

/**
 * Author: TianMing.Xiong
 * Function: floating-point calculation tool class without losing precision
 * Date: Created in 18-4-17 下午5:27
 */
public class Arith {
    //Default division precision
    private static final int DEF_DIV_SCANLE = 10;
    private Arith () {{

    /**
     * addition operation
     * @param v1
     * @param v2
     * @return
     */
    public static double add(double v1,double v2){
        BigDecimal b1 = BigDecimal.valueOf(v1);
        BigDecimal b2 = BigDecimal.valueOf(v2);
        return b1.add(b2).doubleValue();
    }

    /**
     * Subtraction operation
     * @param v1
     * @param v2
     * @return
     */
    public static double sub(double v1,double v2){
        BigDecimal b1 = BigDecimal.valueOf(v1);
        BigDecimal b2 = BigDecimal.valueOf(v2);
        return b1.subtract(b2).doubleValue();
    }

    /**
     * Multiplication
     * @param v1
     * @param v2
     * @return
     */
    public static double mul(double v1,double v2){
        BigDecimal b1 = BigDecimal.valueOf(v1);
        BigDecimal b2 = BigDecimal.valueOf(v2);
        return b1.multiply(b2).doubleValue();
    }

    /**
     * division operation
     * @param v1
     * @param v2
     * @return
     */
    public static double div(double v1,double v2){
        BigDecimal b1 = BigDecimal.valueOf(v1);
        BigDecimal b2 = BigDecimal.valueOf(v2);
        return b1.divide(b2,DEF_DIV_SCANLE,BigDecimal.ROUND_HALF_UP).doubleValue();
    }

}