微信红包算法java版本

public class Main {

    public static void main(String[] args) {
        double[] rs = divide(200, 10, 0.01);
        for (double each : rs) {
            System.out.format("%.2f\n", each);
        }
    }

    private static double[] divide(double totalMoney, int num, double minMoney) {
        double[] each = new double[num];
        for (int i = 0; i < num - 1; i++) {
            // 计算最大安全值，保证不会超出 。如果安全值越大，价格波动越大 .建议是平均值
            double maxSafeMoney = (totalMoney - (num - 1 - i) * minMoney) / (num - 1 - i);
            // 随机算出最小值，保证不低于最小值
            each[i] = Math.random() * (maxSafeMoney - minMoney) + minMoney;
            // 计算当前剩下的钱
            totalMoney = totalMoney - each[i];
        }
        each[num - 1] = totalMoney;
        return each;
    }
}