java学生信息管理系统（源码+数据库脚本）

基于ssm框架的商铺管理系统，数据库mysql。基于maven管理

springboot layui maven前端开发的博客系统，开发工具idea，有前台和后台

【实例简介】有用户注册和登录，还有商家注册和登录，包括完整的数据库，还有，购物车，黑名单，

java版本调用HP-Socket服务端代码，包含jna包及5.0.2版本的HP-Socket的dll文件，采用的是非常新的HP-Socket版本，demo是整套java工程，导入eclipse修改HpSocket.java文件中的服务器的IP和端口就可以测试，里面还包含了客户端接收服务器端返回的信息方法，看懂了客户端基本也可以自己实现服务端

实例中如用到数据库，请到这里下载 https://www.haolizi.net/example/view_30457.html

随着高校教学资源逐步开发，高校教育资源的应用种类逐步增多。而实验室作为高校基本教育资源之一，与日常教学工作开展、课堂项目实践有着密切联系。由此，如何借助新时期技术，加强高校实验室应用数据信息程序开发，在高校智能化管理程序推广中占有基础性地位。该软件是以Java语言为实现预言。其功能在系统内部有源代码直接完成，操作人员只需输入一些简单的汉字，数字，即可达到自己的目标。 登陆账号：admin 密码：123456 package com.company; import com.company.Bean.Student;import com.company.Bean.Teacher;import com.company.Bean.User;import com.company.DB.DB; import javax.swing.*;import java.awt.event.ActionEvent;import java.awt.event.ActionListener; public class Main extends JFrame {    private JPanel p;    private JLabel lblName,lblPwd,lblRole;    private JTextField txtName;    private JPasswordField txtPwd;    private JButton btnOk,btnCancle;    String[] s = {"学生","教师","管理员"};    private JComboBox comboBox;    public Main(){        super("用户登录界面");        p = new JPanel();        p.setLayout(null);        lblRole=new JLabel("角色：");        comboBox=new JComboBox(s);        lblName = new JLabel("账户：");        lblPwd = new JLabel("密码：");        txtName = new JTextField(20);        txtPwd = new JPasswordField(20);        btnOk = new JButton("登录");        btnCancle = new JButton("取消");        //注册确定按钮的事件处理        btnOk.addActionListener(new ActionListener() {            @Override            public void actionPerformed(ActionEvent e) {                String strName = txtName.getText();                String strPwd = new String(txtPwd.getPassword());                System.out.println("用户名:" strName "密码:" strPwd);             }        });        //注册取消按钮的事件处理        btnCancle.addActionListener(new ActionListener() {             @Override            public void actionPerformed(ActionEvent e) {                //清空                txtName.setText("");                txtPwd.setText("");             }        });        lblRole.setBounds(90,50,60,25);        comboBox.setBounds(130,50,140,25);        lblName.setBounds(90,80,60,25);        txtName.setBounds(130,80,140,25);        lblPwd.setBounds(90,110,60,25);        txtPwd.setBounds(130,110,140,25);        btnOk.setBounds(130,150,60,25);        btnCancle.setBounds(200,150,60,25);        p.add(lblRole);        p.add(comboBox);        p.add(lblName);        p.add(txtName);        p.add(lblPwd);        p.add(txtPwd);        p.add(btnOk);        p.add(btnCancle);        this.add(p);        this.setSize(400,300);        this.setLocation(300,300);        //设置窗体不可改变大小        this.setResizable(false);        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        btnOk.addActionListener(new ActionListener() {            @Override            public void actionPerformed(ActionEvent e) {               String account =txtName.getText().trim();               String password=txtPwd.getText().trim();               String role=null;               if(comboBox.getSelectedItem().equals("管理员")){                   role="admin";               }               else if(comboBox.getSelectedItem().equals("学生")) {                   role="student";               }               else{                   role="teacher";               }                if(role.equals("admin")){                    User user=new User(account,password);                    if (DB.Login(user)) {                        JOptionPane.showMessageDialog(null, "登录成功", "", JOptionPane.PLAIN_MESSAGE);                        AdminMain adminMain = new AdminMain();                        adminMain.setVisible(true);                        Main.this.setVisible(false);                    }                      else {                        JOptionPane.showMessageDialog(null,"账号密码错误", "", JOptionPane.PLAIN_MESSAGE);                    }                }                else if (role.equals("student")){                    Student student=new Student(account,password);                    if(DB.studentLogin(student)){                        StudentMain studentMain=new  StudentMain();                        studentMain.setVisible(true);                        Main.this.setVisible(false);                        JOptionPane.showMessageDialog(null, "登录成功", "", JOptionPane.PLAIN_MESSAGE);                    }                    else {                        JOptionPane.showMessageDialog(null,"账号密码错误", "", JOptionPane.PLAIN_MESSAGE);                    }                }                else if (role.equals("teacher")){                   Teacher teacher=new Teacher(account,password);                    if(DB.teacherLogin(teacher)){                        TeacherMain teacherMain=new TeacherMain();                        teacherMain.setVisible(true);                        Main.this.setVisible(false);                        JOptionPane.showMessageDialog(null, "登录成功", "", JOptionPane.PLAIN_MESSAGE);                    }                    else {                        JOptionPane.showMessageDialog(null,"账号密码错误", "", JOptionPane.PLAIN_MESSAGE);                    }                }            }        });        btnCancle.addActionListener(new ActionListener() {            @Override            public void actionPerformed(ActionEvent e) {                            }        });    }    public static void main(String[] args) { // write your code here        Main main=new Main();        main.setVisible(true);     }}

Java 3D饼图透明度(提高篇-实例173).zip

The super-fast evolution of the JDK between versions 8 and 12 has increased the learning curve of modern Java, therefore has increased the time needed for placing developers in the Plateau of Productivity. Its new features and concepts can be adopted to solve a variety of modern-day problems. This book enables you to adopt an objective approach to common problems by explaining the correct practices and decisions with respect to complexity, performance, readability, and more.Java Coding Problems will help you complete your daily tasks and meet deadlines. You can count on the 300 applications containing 1,000 examples in this book to cover the common and fundamental areas of interest: strings, numbers, arrays, collections, data structures, date and time, immutability, type inference, Optional, Java I/O, Java Reflection, functional programming, concurrency and the HTTP 

字节跳动算法面试汇总

学生信息管理，分为教师，学生，管理员，登录账号自动检测账号类型，数据库采用mysql 用idea 打开就可以使用，几乎不用配置(需要用sql脚本创建数据库后 修改下连接串密码即可，如果您本机密码是root那就不需要修改密码) 管理员账号/密码：admin/admin 学生账号/密码：stu03/stu03 教师账号/密码:tec2/tec2