BigDecimal运算（加、减、乘、除）

public class BigDecimalOperation {

    private BigDecimalOperation(){

    }

    public static BigDecimal add(double v1,double v2){

        BigDecimal b1 = new BigDecimal(Double.toString(v1));

        BigDecimal b2 = new BigDecimal(Double.toString(v2));

        return b1.add(b2);

    }

    public static BigDecimal sub(double v1,double v2){

        BigDecimal b1 = new BigDecimal(Double.toString(v1));

        BigDecimal b2 = new BigDecimal(Double.toString(v2));

        return b1.subtract(b2);

    }

    public static BigDecimal mul(double v1,double v2){

        BigDecimal b1 = new BigDecimal(Double.toString(v1));

        BigDecimal b2 = new BigDecimal(Double.toString(v2));

        return b1.multiply(b2);

    }

    public static BigDecimal div(double v1,double v2){

        BigDecimal b1 = new BigDecimal(Double.toString(v1));

        BigDecimal b2 = new BigDecimal(Double.toString(v2));

        return b1.divide(b2,2,BigDecimal.ROUND_HALF_UP);//四舍五入,保留2位小数

    }

}