利用面向对象实现简单的控制台课程管理系统

package com.pf.student2;

import java.util.Scanner;

public class Clinte {

public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
Teacher teacher=new Teacher();//创建教师对象
Student student=new Student();//创建学生对象
Dao dao=new Dao();//创建一个数据库
Menu menu=new Menu();//初始化菜单
while (true) {
System.out.println("-------------------------------------------");
System.out.println(" 欢迎来到学生管理系统");
System.out.println("请选择角色：");
System.out.println("1、老师");
System.out.println("2、学生");
System.out.println("3、退出");
switch (scanner.nextInt()) {
case 1:
teacher.addDao(dao);
menu.menu(teacher);
break;
case 2:
student.addDao(dao);
menu.menu(student);
break;
case 3:
return;
default:
System.out.println("输入菜单错误!,请重新输入菜单号。");
break;
}
}
}
}

package com.pf.student2;

//课程类
public class Course {
public String name;
public int id;
public int time;
public Course(String name, int id, int time) {
super();
this.name = name;
this.id = id;
this.time = time;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public int getTime() {
return time;
}
public void setTime(int time) {
this.time = time;
}
}

package com.pf.student2;

public class Dao {
public Course storeCourse[]=new Course[100];//创建一个教师书库
public Course studentCourse[]=new Course[10];//创建一个学生书库
public int courseNumber=0;//记录学生选了多少个课程
public int storeNumber=0;//记录书库了的图书的数量
}

package com.pf.student2;

public class Menu {
public Person person;
public void menu(Person person){
person.menu();
}
}

package com.pf.student2;

public class Person {

public void add(Course course){
System.out.println("person的add方法");
}

public void delect(){
System.out.println(
4000
"person的delect方法");
}

public void query(){
System.out.println("person的query方法");
}

public void menu(){
System.out.println("person菜单");
}

public void addDao(Dao dao){

}
}

package com.pf.student2;

import java.util.Scanner;

public class Student extends Person {
Scanner scanner = new Scanner(System.in);
Dao dao;

@Override
public void add(Course course) {
System.out.println("student的add方法");
}

@Override
public void delect() {
System.out.println("student的delect方法");
}

@Override
public void query() {
if (dao.storeNumber != 0) {
System.out.println("-------------------------------------------");
System.out.println("课程编号\t\t课程名称\t\t课程课时");
for (int i = 0; i < dao.storeNumber; i++) {
System.out.print(dao.storeCourse[i].getId() + "\t\t");
System.out.print(dao.storeCourse[i].getName() + "\t\t");
System.out.print(dao.storeCourse[i].getTime() + "\t\t");
System.out.println();
}
}else{
System.out.println("-------------------------------------------");
System.out.println("数据为空！");
}
}

public void queryPerson(){
if (dao.courseNumber != 0) {
System.out.println("-------------------------------------------");
System.out.println("课程编号\t\t课程名称\t\t课程课时");
for (int i = 0; i < dao.courseNumber; i++) {
System.out.print(dao.studentCourse[i].getId() + "\t\t");
System.out.print(dao.studentCourse[i].getName() + "\t\t");
System.out.print(dao.studentCourse[i].getTime() + "\t\t");
System.out.println();
}
}else{
System.out.println("-------------------------------------------");
System.out.println("数据为空！");
}
}

@Override
public void menu() {
while (true) {
System.out.println("-------------------------------------------");
System.out.println("你选择的是老师的角色 请选择菜单：");
System.out.println("1、查询所有课程");
System.out.println("2、选择相应课程");
System.out.println("3、我的选课");
System.out.println("4、退出角色");
switch (scanner.nextInt()) {
case 1:
query();
break;
case 2:
query();
System.out.println("请输入相应课程的编号：");
int id=scanner.nextInt();
for(int i=0;i<dao.storeNumber;i++){
if(dao.storeCourse[i].getId()==id){
dao.studentCourse[dao.courseNumber]=dao.storeCourse[i];
dao.courseNumber++;
System.out.println("选课成功！");
break;
}
}

break;
case 3:
queryPerson();
break;
case 4:
return;
default:
System.out.println("输入菜单错误!,请重新输入菜单号。");
break;
}
}
}

// 添加书库
@Override
public void addDao(Dao dao) {
this.dao = dao;
}
}

package com.pf.student2;

import java.util.Scanner;

public class Teacher extends Person {
Scanner scanner = new Scanner(System.in);
Dao dao;

@Override
public void add(Course course) {
dao.storeCourse[dao.storeNumber] = course;
dao.storeNumber++;
}

@Override
public void delect() {
query();
System.out.println("请输入课程的编号：");
int id=scanner.nextInt();
int index=0;
for(int i=0;i<dao.storeNumber;i++){
if(dao.storeCourse[i].getId()==id){
index=i;
for(int j=index+1;j<dao.storeNumber;j++){
dao.storeCourse[j-1]=dao.storeCourse[j];
}
dao.storeNumber--;
break;
}
}
}

@Override
public void query() {
if (dao.storeNumber != 0) {
System.out.println("-------------------------------------------");
System.out.println("课程编号\t\t课程名称\t\t课程课时");
for (int i = 0; i < dao.storeNumber; i++) {
System.out.print(dao.storeCourse[i].getId() + "\t\t");
System.out.print(dao.storeCourse[i].getName() + "\t\t");
System.out.print(dao.storeCourse[i].getTime() + "\t\t");
System.out.println();
}
}else{
System.out.println("-------------------------------------------");
System.out.println("数据为空！");
}
}

@Override
public void menu() {
while (true) {
System.out.println("-------------------------------------------");
System.out.println("你选择的老师的角色 选择菜单：");
System.out.println("1、添加课程");
System.out.println("2、查询所有课程");
System.out.println("3、删除课程");
System.out.println("4、退出角色");
switch (scanner.nextInt()) {
case 1:
System.out.println("请输入课程名称：");
String name = scanner.next();
System.out.println("请输入课程的课时：");
int time = scanner.nextInt();
Course course = new Course(name, dao.storeNumber + 1, time);
add(course);
System.out.println("课程添加完毕");
break;
case 2:
query();
break;
case 3:
delect();
System.out.println("课程删除完毕");
break;
case 4:
return;
default:
System.out.println("输入菜单错误!,请重新输入菜单号。");
break;
}
}
}

// 添加书库
@Override
public void addDao(Dao dao) {
this.dao = dao;
}
}