super只能用定义在方法，而extends定义类与方法都可使用，是吗？

老师，请问有JDK1.8的吗？能发个链接吗

import csv

with open("csv.csv", 'r', encoding='utf-8') as f:
    a = csv.reader(f)
    for row in a:
        print(row)

为啥会读出很多空白行，数据明明只有两行。

package com;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;

//创建点对点的聊天应用
//创建服务端

/**
 * 发送消息线程
 */
class Send extends Thread{
    private Socket socket;
    public Send(Socket socket){
        this.socket = socket;
    }

    public Send(Socket socket, Scanner scanner) {
    }

    @Override
    public void run() {
        this.sendMsg();
    }
    /**
     * 发送消息
     */
    private void sendMsg(){
        //创建Scanner对象
        try(Scanner scanner = new Scanner(System.in);
            //创建向对方输出消息的流对象
            PrintWriter pw = new PrintWriter(this.socket.getOutputStream());){

            while(true){
                String msg = scanner.nextLine();
                pw.println(msg);
                pw.flush();
            }
        }catch(Exception e){
            e.printStackTrace();
        }
    }
}

/**
 * 接收消息的线程
 */
class Receive extends Thread{
    private Socket socket;
    public Receive(Socket socket){
        this.socket = socket;
    }
    @Override
    public void run() {
        this.receiveMsg();
    }
    /**
     * 用于接收对方消息的方法
     */
    private void receiveMsg(){
        //创建用于接收对方发送消息的流对象
        try(BufferedReader br = new BufferedReader(new InputStreamReader(this.socket.getInputStream()));){

            while(true){
                String msg = br.readLine();
                System.out.println("他说："+msg);
            }
        }catch(Exception e){
            e.printStackTrace();
        }
    }
}
public class ChatSocketServer {
    public static void main(String[] args) {

        try(ServerSocket serverSocket = new ServerSocket(8888);){
            System.out.println("服务端启动，等待连接。。。。。");
            Socket socket = serverSocket.accept();
            System.out.println("连接成功！");
            new Send(socket).start();
            new Receive(socket).start();
        }catch(Exception e){
            e.printStackTrace();
        }
    }
}

老师为啥我这边连接成功以后会显示我上面这个代码的36，27行有空指针异常呢，不知道怎么处理

老师这个搜索框我用Long类型的编号写的搜索框会报错

就是咱这个domain写的personId的类型是Long类型，到了html5里面用number， 用text，他都报错，应该用啥，他报的是数据类型转换的错就是下面这个

Failed to convert property value of type 'java.lang.String' to required type 'long' for property 'personId'; nested exception is java.lang.NumberFormatException: For input string: ""

所以，这个地方该用什么。。。我把这个注释掉就不报错了

print(os.path.split(path))

的结果是('C:\\Users\\26284\\PycharmProjects\\pythonProject\\02', 'e.text')

但当我

from os import path

然后使用

print(path.split(path))

结果就变成了

这是为什么呢？

而且用path.的话有些属性用不了，必须要os.path.

老师，我想请问一下是需要下载虚拟机是吗？输入查看不了Vmvare得ip

老师，我这个键盘不能控制，就一直呆在那不动

File "d:\software\programminglanauageenvironment\pytho3.8.6\lib\runpy.py", line 194, in _run_module_as_main

    return _run_code(code, main_globals, None,

  File "d:\software\programminglanauageenvironment\pytho3.8.6\lib\runpy.py", line 87, in _run_code

    exec(code, run_globals)

  File "D:\software\python_env\alway_env\Scripts\scrapy.exe\__main__.py", line 4, in <module>

  File "D:\software\python_env\alway_env\lib\site-packages\scrapy\__init__.py", line 12, in <module>

    from scrapy.spiders import Spider

  File "D:\software\python_env\alway_env\lib\site-packages\scrapy\spiders\__init__.py", line 93, in <module>

    from scrapy.spiders.crawl import CrawlSpider, Rule

  File "D:\software\python_env\alway_env\lib\site-packages\scrapy\spiders\crawl.py", line 14, in <module>

    from scrapy.utils.spider import iterate_spider_output

  File "D:\software\python_env\alway_env\lib\site-packages\scrapy\utils\spider.py", line 5, in <module>

    from scrapy.utils.defer import deferred_from_coro

  File "D:\software\python_env\alway_env\lib\site-packages\scrapy\utils\defer.py", line 24, in <module>

    from scrapy.utils.reactor import is_asyncio_reactor_installed

  File "D:\software\python_env\alway_env\lib\site-packages\scrapy\utils\reactor.py", line 5, in <module>

    from twisted.internet import asyncioreactor, error

  File "D:\software\python_env\alway_env\lib\site-packages\twisted\internet\asyncioreactor.py", line 19, in <module>

    from twisted.internet.posixbase import (

  File "D:\software\python_env\alway_env\lib\site-packages\twisted\internet\posixbase.py", line 19, in <module>

    from twisted.internet import error, tcp, udp

  File "D:\software\python_env\alway_env\lib\site-packages\twisted\internet\tcp.py", line 38, in <module>

    from twisted.internet._newtls import (

  File "D:\software\python_env\alway_env\lib\site-packages\twisted\internet\_newtls.py", line 18, in <module>

    from twisted.protocols.tls import TLSMemoryBIOFactory, TLSMemoryBIOProtocol

  File "D:\software\python_env\alway_env\lib\site-packages\twisted\protocols\tls.py", line 42, in <module>

    from OpenSSL.SSL import Connection, Error, SysCallError, WantReadError, ZeroReturnError

  File "D:\software\python_env\alway_env\lib\site-packages\OpenSSL\__init__.py", line 8, in <module>

    from OpenSSL import SSL, crypto

  File "D:\software\python_env\alway_env\lib\site-packages\OpenSSL\SSL.py", line 19, in <module>

    from OpenSSL.crypto import (

  File "D:\software\python_env\alway_env\lib\site-packages\OpenSSL\crypto.py", line 3224, in <module>

    utils.deprecated(

这是什么原因？pip install cryptography==36.0.2换成这个版本以后报这个错误

，老师，请问一下为什么不能连接，网络不好吗

和老师视频上的差不多的，但是，总有问题，方法也显示没引用

老师，这个问题是怎么解决的啊，是软件的问题吗

老师，为什么如果文件名称是“壹.jpg”，这个“壹打印出来还是乱码呢？其他中文打印出来都是正确的。”

com.bjsxt.test02java.util.RandomTestEnum {
    (String[] args) {
        System..println(Season.)(Week k:Week.()){System..println(k)}
       Week[] ws= Week.values()System..println(ws[])a=Random().nextInt()(Season.()[a]){
            :
                System..println():
                System..println():
                System..println():
                System..println()}

    }

    }

Season{
    }
Week {
    }

<form action="提交页面.html">
    <p>
        性别：
        <input type="radio" name="sex" id="man"/>
        <lable for="man">男</lable>
        <input type="radio" name="sex"id="woman"/>
        <lable for="woman">女</lable>
    </p>
</form>

提升用户体验度点击文字这里，代码如上，浏览器里却不能点击文字