抢红包的金额算法

public static double getRandomMoney(RedPackage _redPackage) {
    
    
    // remainSize 剩余的红包数量
    // remainMoney 剩余的钱
    if (_redPackage.remainSize == 1) {
    
    
        _redPackage.remainSize--;
        return (double) Math.round(_redPackage.remainMoney * 100) / 100;
    }
    Random r     = new Random();
    double min   = 0.01; //
    double max   = _redPackage.remainMoney / _redPackage.remainSize * 2;
    double money = r.nextDouble() * max;
    money = money <= min ? 0.01: money;
    money = Math.floor(money * 100) / 100;
    _redPackage.remainSize--;
    _redPackage.remainMoney -= money;
    return money;
}

原文链接：https://www.zhihu.com/question/22625187