double计算的工具类

public static double dmul(double v1,double v2){    BigDecimal b1 = new BigDecimal(Double.toString(v1));    BigDecimal b2 = new BigDecimal(Double.toString(v2));    return b1.multiply(b2).doubleValue();}public static double dsum(double v1,double v2){    BigDecimal b1 = new BigDecimal(Double.toString(v1));    BigDecimal b2 = new BigDecimal(Double.toString(v2));    return b1.add(b2).doubleValue();}