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
    }

}