java作业学生成绩管理系统

叁歲伎倆 2022-12-30 10:44 260阅读 0赞

# java基础学习作业，基于控制台实习，数据存储使用List  #

# 要求 #

应用面向对象的思想，设计实现一个课程成绩统计系统，实现如下功能：

1. 管理员登录，登录成功可以对成绩进行管理；

2. 显示成绩信息；

3．添加成绩信息；

4．修改成绩信息；

5．删除成绩信息；

6．查询成绩信息。

# 代码实现  #

完整代码在最下方

## 目录 ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMzg5MzU0_size_16_color_FFFFFF_t_70][]

## 效果 ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMzg5MzU0_size_16_color_FFFFFF_t_70 1][]

## 核心代码 ##

**MenuService类（菜单）**

package com.niu.service;
    
    import com.niu.model.Student;
    import com.niu.model.SysUser;
    
    import java.util.*;
    
    /**
     * @description:
     * @author: nxq email: niuxiangqian163@163.com
     * @createDate: 2020/12/24 6:54 下午
     * @updateUser: nxq email: niuxiangqian163@163.com
     * @updateDate: 2020/12/24 6:54 下午
     * @updateRemark:
     * @version: 1.0
     **/
    public class MenuService {
        private Scanner scan = new Scanner(System.in);
    
        private static final List<String> menu = new ArrayList<>();
        private StudentService studentService = new StudentService();
        private LoginService loginService = new LoginService();
        static {
            //初始化菜单
            menu.add("显示成绩信息");
            menu.add("添加成绩信息");
            menu.add("修改成绩信息");
            menu.add("删除成绩信息");
            menu.add("查询成绩信息");
            menu.add("退出");
        }
    
        /**
         * 选择菜单
         * @author nxq
         * @param id:
         * @return void
         */
        public boolean choice(String id){
            switch (id){
                case "1":
                    studentService.showAll();
                    break;
                case "2":
                    add();
                    break;
                case "3":
                    modify();
                    break;
                case "4":
                    delete();
                    break;
                case "5":
                    find();
                    break;
                case "6":
                    System.out.println("退出！");
                    return false;
                default:
                    System.out.println("输入的菜单有误");
            }
            return true;
        }
    
        /**
         * 展示菜单
         * @author nxq
         * @param :
         * @return void
         */
        public void showMenu(){
            System.out.println("*************菜单*************");
            for (int i = 0; i < menu.size(); i++) {
                System.out.println(1+i+"."+menu.get(i));
            }
            System.out.println("------------------------------");
        }
        /**
         * 登陆
         * @author nxq
         * @param :
         * @return void
         */
        public boolean login(){
            System.out.print("请输入用户名:");
            String userName = scan.next();
            System.out.print("请输入密码:");
            String password = scan.next();
            SysUser result =  loginService.login(userName,password);
            if (null == result){
                System.out.println("登陆失败，帐号密码有误，请重新登陆");
            }else {
                System.out.println("登陆成功");
            }
            return null != result;
    
    
        }
        /**
         * 添加
         * @author nxq
         * @param :
         * @return void
         */
        public void add(){
            System.out.println("请输入学号");
            String stuNo = scan.next();
            System.out.println("请输入姓名");
            String name = scan.next();
            System.out.println("请输入成绩");
            Integer score = scan.nextInt();
            studentService.add(new Student(stuNo,name,score));
            System.out.println("添加成功");
    
        }
        /**
         * 修改
         * @author nxq
         * @param :
         * @return void
         */
        public boolean modify(){
            System.out.println("请输入学号");
            String stuNo = scan.next();
            Student student = studentService.findByStuNo(stuNo);
            if (null == student){
                System.out.println("该学生不存在");
                return false;
            }
            showStudent(student);
            System.out.println("请输入新成绩");
            Integer score = scan.nextInt();
            studentService.modifyScore(stuNo,score);
            System.out.println("修改成功");
            return true;
    
        }
        /**
         * 删除
         * @author nxq
         * @param :
         * @return void
         */
        public void delete(){
            System.out.println("请输入学号");
            String stuNo = scan.next();
            Student student = studentService.findByStuNo(stuNo);
            if (null == student){
            }
            showStudent(student);
            studentService.remove(stuNo);
            System.out.println("删除成功");
        }
        /**
         * 查找
         * @author nxq
         * @param :
         * @return void
         */
        public void find(){
            System.out.println("请输入学号");
            String stuNo = scan.next();
            Student student = studentService.findByStuNo(stuNo);
            if (null == student){
                System.out.println("该学生不存在");
            }
            showStudent(student);
    
        }
    
        private void showStudent(Student student){
            System.out.print("学生信息：");
            System.out.println(student.getStuNo()+"\t"+student.getName()+"\t"+student.getScore());
    
        }
    }

**StudentService学生操作相关**

package com.niu.service;
    
    import com.niu.dao.DataBase;
    import com.niu.model.Student;
    
    /**
     * @description: 学生相关
     * @author: nxq email: niuxiangqian163@163.com
     * @createDate: 2020/12/24 7:07 下午
     * @updateUser: nxq email: niuxiangqian163@163.com
     * @updateDate: 2020/12/24 7:07 下午
     * @updateRemark:
     * @version: 1.0
     **/
    public class StudentService {
    
        public void add(Student student){
            DataBase.studentList.add(student);
        }
        public void showAll(){
            System.out.println("学号\t姓名\t分数");
            for (Student student : DataBase.studentList) {
                System.out.println(student.getStuNo()+"\t"+student.getName()+"\t"+student.getScore());
            }
        }
        /**
         * 修改分数
         * @author nxq
         * @param stuNo:
         * @param score:
         * @return void
         */
        public void modifyScore(String stuNo,Integer score){
            for (Student db : DataBase.studentList) {
                if (db.getStuNo().equals(stuNo)){
                    db.setScore(score);
                    return;
                }
            }
    
        }
        /**
         * 根据学号查询学生
         * @author nxq
         * @param stuNo:
         * @return com.niu.model.Student
         */
        public Student findByStuNo(String stuNo){
            for (Student student :DataBase.studentList){
                if (student.getStuNo().equals(stuNo)){
                    return student;
                }
            }
            System.out.println("学生不存在");
    
          return   null;
        }
        /**
         * 删除学生信息
         * @author nxq
         * @param stuNo:
         * @return boolean
         */
        public boolean remove(String stuNo){
            Student stuRemove = null;
            for (Student student : DataBase.studentList) {
                if (student.getStuNo().equals(stuNo)){
                    stuRemove = student;
                    break;
                }
            }
            if (stuRemove==null){
                System.out.println("该学生不存在");
                return false;
            }
            DataBase.studentList.remove(stuRemove);
            return true;
    
        }
    
    
    }

完整代码：[https://download.csdn.net/download/qq\_41389354/13773956][https_download.csdn.net_download_qq_41389354_13773956]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMzg5MzU0_size_16_color_FFFFFF_t_70]: /images/20221120/9f9cbb5b2dc54fd4a60c1214719ddd72.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMzg5MzU0_size_16_color_FFFFFF_t_70 1]: /images/20221120/a5d564d4cd394567b870395f8627d2bf.png
[https_download.csdn.net_download_qq_41389354_13773956]: https://download.csdn.net/download/qq_41389354/13773956