java 获取传入值的区间

 /**
      * 获取值的区间
      *
      * @param num 值
      */
     public static Map<String, Integer> getNumSection(Integer num) {
         Map<String, Integer> map = new HashMap();
         int length = num.toString().length();
         if (length == 1) {   //判断是否为个数 1234567890
             map.put("maxNum", 0);
             map.put("minNum", 10);
             return map;
         }
         String count = "";
         for (int i = 1; i < length; i++) {
             count += "0";
         }
         String shou = num.toString().substring(0, 1);
         int maxNum = Integer.parseInt(shou + count);//最小
         int minNum = Integer.parseInt(String.valueOf(Integer.parseInt(shou) + 1) + count);//最大
         map.put("maxNum", maxNum);
         map.put("minNum", minNum);
         return map;
     }