public static void main(String[] args)
{
  // 發(fā)100元紅包，10人搶
  // TODO Auto-generated method stub
  // 發(fā)紅包總金額100元
  double S = 100;
  // 0-100之間9個(gè)節(jié)點(diǎn)，加首尾11個(gè)點(diǎn)賦值給數(shù)組a
  double[] a = new double[11];
  // 第一個(gè)數(shù)是0
  a[0] = 0;
  // 最后一個(gè)數(shù)是100
  a[a.length - 1] = S;
  // 生成9個(gè)數(shù)隨機(jī)節(jié)點(diǎn)并保留兩位小數(shù)
  for (int m = 1; m < a.length - 1; m++)
  {
    a[m] = Double.valueOf(String.format("%.2f", S * Math.random()));
  }
  // 冒泡排序?qū)?個(gè)點(diǎn)進(jìn)行排序
  for (int i = 1; i < a.length - 2; i++)
  {
    for (int j = 1; j < a.length - 1 - i; j++)
    {
      if (a[j] > a[j + 1])
      {
        double temp;
        temp = a[j];
        a[j] = a[j + 1];
        a[j + 1] = temp;
      }
    }
  }
  //紅包金額賦值給數(shù)組aa
  double[] aa = new double[a.length - 1];
  // 后一項(xiàng)減前一項(xiàng)的差值為紅包金額
  for (int n = 0; n < a.length - 1; n++)
  {
    double mon = a[n + 1] - a[n];
    //用自己的算法實(shí)現(xiàn)四舍五入保留兩位小數(shù)
    int n1 = (int) (mon * 1000);
    int c = n1 % 10;
    if (c > 4)
      mon = (double) ((n1 + 10) / 10) / 100;
    else
      mon = (double) (n1 / 10) / 100;
    aa[n] = mon;
  }
  //列表打亂數(shù)組aa中的順序，實(shí)現(xiàn)搶紅包的次序與紅包金額匹配隨機(jī)
  List<Double> list = new ArrayList<>();
  for(int i = 0; i < aa.length; i++)
  {
    list.add(aa[i]);
  }
  Collections.shuffle(list);
  for(double i:list)
  System.out.println(i);
}