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
效果
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: [email protected]
* @createDate: 2020/12/24 6:54 下午
* @updateUser: nxq email: [email protected]
* @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: [email protected]
* @createDate: 2020/12/24 7:07 下午
* @updateUser: nxq email: [email protected]
* @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