找水王

设计了一个灌水论坛。信息学院的学生都喜欢在上面交流灌水，传说在论坛上有一个“水王”，他不但喜欢发帖，还会回复其他ID发的每个帖子。坊间风闻该“水王”发帖数目超过了帖子数目的一半。 如果你有一张当前论坛的帖子（包括回帖）列表，其中帖子的作者的ID也在其中，你能快速的找到这个传说中的水王吗？

水王主要是帖子数超过了半数

 

package dao;

 

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.Statement;

import java.util.ArrayList;

 

import com.sun.org.apache.regexp.internal.recompile;

public class Dao

{

    String findRyan()

    {

 

        String db_url = "jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT%2B8";

        String db_user = "root";

        String db_password = "";

        Connection conn = null;

        Statement state = null;

        ResultSet rs = null;

        ArrayList<String> list = new ArrayList<>();

        try

        {

            Class.forName("com.mysql.jdbc.Driver");

            conn = DriverManager.getConnection(db_url, db_user, db_password);

            state = conn.createStatement();

            rs = state.executeQuery("select uid,reid from post");

            while (rs.next())

            {

                String idList = rs.getString("uid") + "|" + rs.getString("reid");

                if (!(idList).equals(""))

                {

                    for (String id : idList.split("\|"))

                    {

                        list.add(id);

                    }

                }

            }

            ;

        } catch (Exception e)

        {

            e.printStackTrace();

        }

        System.out.println(list);

        for (int i = 0; i < list.size() - 1; i++)

        {

            if (!list.get(i).equals(list.get(i + 1)))

            {

                list.set(i, "a");

                list.set(i + 1, "a");

                i=i+1;

            }

        }

        System.out.println(list);

        return null;

    }

 

    public static void main(String[] args)

    {

        Dao aDao = new Dao();

        aDao.findRyan();

    }

}