BigDecimal工具类处理精度计算

/**
 * Created by My_coder on 2017-07-27.
 * 加减乘除计算工具类
 */
public class BigDecimalUtil {
    private BigDecimalUtil() {
    }

    /**
     * 加
     */
    public static BigDecimal add(Double v1, Double v2){
        BigDecimal b1 = new BigDecimal(v1.toString());
        BigDecimal b2 = new BigDecimal(v2.toString());
        return b1.add(b2);
    }
    /**
     * 减
     */
    public static BigDecimal sub(Double v1, Double v2){
        BigDecimal b1 = new BigDecimal(v1.toString());
        BigDecimal b2 = new BigDecimal(v2.toString());
        return b1.subtract(b2);
    }
    /**
     * 乘
     */
    public static BigDecimal mul(Double v1, Double v2){
        BigDecimal b1 = new BigDecimal(v1.toString());
        BigDecimal b2 = new BigDecimal(v2.toString());
        return b1.multiply(b2);
    }
    /**
     * 除
     */
    public static BigDecimal div(Double v1, Double v2){
        BigDecimal b1 = new BigDecimal(v1.toString());
        BigDecimal b2 = new BigDecimal(v2.toString());
        //四舍五入，保留两位小数
        return b1.divide(b2,2,BigDecimal.ROUND_HALF_DOWN);
    }
}