我在练习使用工具类读取配置文件，从而访问数据库。但是为什么Connection为null啊

Question

package cn.itcast.jdbcutils;

import java.sql.*;
import java.io.*;
import java.util.Properties;

public class JDBCUtils2
{
private static Connection con;
private static String driver;
private static String url;
private static String user;
private static String password;
private JDBCUtils2(){}

static
{
    try
    {
        readConfig();
        Class.forName(driver);
        Connection con=DriverManager.getConnection(url,user,password);
    }
    catch(Exception e)
    {
        throw new RuntimeException("数据库连接失败"+e);
    }

}

private static void readConfig()throws Exception
{
    InputStream in=JDBCUtils2.class.getClassLoader().getResourceAsStream("database.properties");
    Properties p=new Properties();
    p.load(in);//会抛出IO异常
    String driver=p.getProperty("driver");
    String url=p.getProperty("url");
    String user=p.getProperty("user");
    String password=p.getProperty("password");
}

public static Connection getConnection()
{
    return con;
}

}

Answer 1

Connection con=DriverManager.getConnection(url,user,password);
这里面的参数，哪里给赋值了？