计算用户占比并保留两位小数

final\ BigDecimal\ numberOfUsersBD\ =\ new\ BigDecimal\ (numberOfUsers);\ final\ BigDecimal\ totalUserNumberBD\ =\ new\ BigDecimal\ (totalUserNumber);\ \ \ BigDecimal\ result\ =\ numberOfUsersBD.divide\ (totalUserNumberBD,\ 2,\ RoundingMode.HALF_UP);