中奖概率算法java

以下是两种Java中奖概率算法的例子：

1. 根据奖品过期日期计算中奖概率

public double calculateProbability(Date expireDate, Date currentDate, int decayType) {
    double probability = 0.0;
    long expireTime = expireDate.getTime();
    long currentTime = currentDate.getTime();
    long timeDiff = expireTime - currentTime;
    if (timeDiff > 0) {
        switch (decayType) {
            case 1:
                probability = (double) timeDiff / expireTime;
                break;
            case 2:
                probability = Math.pow((double) timeDiff / expireTime, 2);
                break;
            // 可以添加更多的衰减类型
            default:
                probability = (double) timeDiff / expireTime;                break;
        }
    }
    return probability;
}

2. 逢“几”中奖算法

public int calculateLuckyNumber(int totalPeople, int totalPrizes, int N) {
    int luckyNumber = (int) Math.ceil((double) totalPeople / totalPrizes) * N;    return luckyNumber;
}