drop database if exists db_student01;
create database db_student01;
use db_student01;
drop table if exists tb_grade;
drop table if exists tb_teacheruser;
drop table if exists tb_stuuser;
drop ...
1、Server端
package com.bbs2018.server;
import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
//https://blog.csdn.net/zqq3436/article/details/80306812
public class Server {
...
public class Hello {
public static void main(String[] args) {
System.out.println("Hello");
Cat cat01 = new Cat();
cat01.eat();
int cat_legs = cat01.legs = 4;
...