生成10到20之间的随机数        int max=20;        int min=10;        Random random = new Random();        int s = random.nextInt(max)%(max-min+1) + min;        System.out.println(s);生成不一样的随机数List
     
       index = new ArrayList
      
       ();for (int k = 0; k < 10;) {    int in = new Random().nextInt(20);    if (index.contains(in)) {        k = k;        System.out.println("重复");    } else {        index.add(in);        k++;    }}