Java如何实现简易教务管理系统

import java.util.Scanner; public class Main {	public static void main(String[] args) {	System.out.println("\t\t简易教务管理系统");	System.out.println("1、录入学生\t2、显示学生\t3、录入课程\t4、显示课程\t5、录入教师" +"\t6、显示教师\t7、学生选课\t8、教师录入成绩\t9、教师排课\t10、授课评价\t0、退出");	Student[] students=null;	Course courses[]=null;	Teacher teachers[]=null;	Operator operator=new Operator();	Scanner scan= new Scanner(System.in);	itcase: while (true) { //显示系统主菜单	System.out.print("请选择功能菜单:"); int choice = scan.nextInt();// 接收用户的选择	switch(choice){	case 1: // 输入学生信息	System.out.println("请输入学生数：");	int n = scan.nextInt();	students = new Student[n];	operator.addStudents(students);	break; case 2: // 显示全部学生信息	operator.displayStudents(students);	break; case 3://录入课程	System.out.println("请输入课程数：");	n = scan.nextInt();	courses = new Course[n];	operator.addCourses(courses);	break; case 4: // 显示课程	operator.displayCourses(courses);	break;	case 5: // 录入教师	System.out.println("请输入教师数：");	n = scan.nextInt();	teachers = new Teacher[n];	operator.addTeachers(teachers);	break;	case 6:// 显示教师	operator.displayTeachers(teachers);	break;	case 7:// 学生选课	operator.stuSelectCourses(students, courses);	break;	case 8:// 录入成绩	operator.inputScores(students);	break;	case 9:// 教师排课	operator.assignTeachCourses(teachers, courses);	break;	case 10:// 授课评价	operator.inputEvaluate(teachers);	break;	case 0:// 退出	break itcase;	default:	System.out.println("非法命令！");	}	}	}

public class Course {	private String courseId;//课程号	private String courseName;//课程名称	private double credit;//学分	//构造方法	Course(){	}	Course(String courseId,String courseName,double credit){	this.setCourseId(courseId);	this.setCourseName(courseName);	this.setCredit(credit);	}	public String getCourseId() {	return courseId;	}	public void setCourseId(String courseId) {	this.courseId = courseId;	}	public String getCourseName() {	return courseName;	}	public void setCourseName(String courseName) {	this.courseName = courseName;	}	public double getCredit() {	return credit;	}	public void setCredit(double credit) {	this.credit = credit;	} }

import java.util.Scanner; public class Operator {	Scanner scan;	Operator(){	scan= new Scanner(System.in);	}	//录入课程	public void addCourses(Course[] courses){	System.out.println("请输入学生信息：格式为课程号,课程名,学分");	String str;	String sInfor[];	for(int i=0;i<courses.length;i++){	str=scan.next();	sInfor=str.split(",");	courses[i]=new Course(sInfor[0],sInfor[1],Double.parseDouble(sInfor[2]));	}	}	//显示所有课程	public void displayCourses(Course[] courses){	for(int i=0;i<courses.length;i++){	System.out.println("课程号："+courses[i].getCourseId()+",课程名："+courses[i].getCourseName() +",学分："+courses[i].getCredit());	}	}	//录入学生	public void addStudents(Student[] students){	System.out.println("请输入学生信息：格式为学号,姓名,性别,电话,地址,年龄");	String str;	String sInfor[];	for(int i=0;i<students.length;i++){	str=scan.next();	sInfor=str.split(",");	students[i]=new Student(sInfor[0],sInfor[1],sInfor[2],sInfor[3], sInfor[4],Integer.parseInt(sInfor[5]));	}	}	//显示学生所有信息	public void displayStudents(Student[] students){	for(int i=0;i<students.length;i++){	System.out.println("学号："+students[i].getStuId()+",姓名："+students[i].getStuName() +",性别："+students[i].getSex()+",电话："+students[i].getTel() +",住址："+students[i].getAddress()+",年龄："+students[i].getAge());	if(students[i].selCourse!=null){	for(int j=0;j<students[i].selCourse.length;j++){	System.out.println("\t\t课程编号："+students[i].selCourse[j].courseId+",成绩：" +students[i].selCourse[j].grade);	}	}	}	}	//录入教师	public void addTeachers(Teacher[] teachers){	System.out.println("请输入教师信息：格式为工号,姓名,性别,电话,职称,年龄");	String str;	String sInfor[];	for(int i=0;i<teachers.length;i++){	str=scan.next();	sInfor=str.split(",");	teachers[i]=new Teacher(sInfor[0],sInfor[1],sInfor[2],sInfor[3],sInfor[4],Integer.parseInt(sInfor[5]));	}	}	//显示教师所有信息	public void displayTeachers(Teacher[] teachers){	for(int i=0;i<teachers.length;i++){	System.out.println("工号："+teachers[i].getTeaId()+",姓名："+teachers[i].getTeaName() +",性别："+teachers[i].getSex()+",电话："+teachers[i].getTel() +",职称："+teachers[i].getProfessor()+",年龄："+teachers[i].getAge());	if(teachers[i].teachCourse!=null){	for(int j=0;j<teachers[i].teachCourse.length;j++){	System.out.println("\t\t课程编号："+teachers[i].teachCourse[j].courseId+",授课评价："+teachers[i].teachCourse[j].evaluate);	}	}	}	}	//学生选课	public void stuSelectCourses(Student[] students,Course[] courses){	System.out.println();	System.out.println("\t课程信息系如下：");	for(int i=0;i<courses.length;i++){	System.out.println("课程号："+courses[i].getCourseId()+"\t"+"课程名称：" +courses[i].getCourseName());	}	System.out.println();	System.out.println("请选择选修课程，格式为：课程号1,课程号2,......");	for(int i=0;i<students.length;i++){	System.out.println("学号："+students[i].getStuId()+"，姓名：" +students[i].getStuName()+" 选课：");	String str=scan.next();	String[] cIds=str.split(",");	students[i].setSelCourse(cIds);	}	}	//教师排课	public void assignTeachCourses(Teacher[] teachers,Course[] courses){	System.out.println();	System.out.println("\t课程信息系如下：");	for(int i=0;i<courses.length;i++){	System.out.println("课程号："+courses[i].getCourseId() +"\t"+"课程名称："+courses[i].getCourseName());	}	System.out.println();	System.out.println("请选择课程，格式为：课程号1,课程号2,......");	for(int i=0;i<teachers.length;i++){	System.out.println("工号："+teachers[i].getTeaId() +"，姓名："+teachers[i].getTeaName()+" 排课：");	String[] cIds=scan.next().split(",");	teachers[i].setTeachCourse(cIds);	}	}	//教师录入成绩	public void inputScores(Student[] students){	for(int i=0;i<students.length;i++){	for(int j=0;j<students[i].selCourse.length;j++){	System.out.println("请输入学号："+students[i].getStuId() +",姓名："+students[i].getStuName() +", 课程编号为："+students[i].selCourse[j].courseId+"的成绩：");	students[i].selCourse[j].grade=scan.nextDouble();	}	}	}	//教师授课评价	public void inputEvaluate(Teacher[] teachers){	for(int i=0;i<teachers.length;i++){	for(int j=0;j<teachers[i].teachCourse.length;j++){	System.out.println("请输入工号："+teachers[i].getTeaId()+",姓名："+teachers[i].getTeaName() +", 课程编号为："+teachers[i].teachCourse[j].courseId+"的授课评价：");	teachers[i].teachCourse[j].evaluate=scan.next();	}	}	}	//删除某门课程	public void delCourses(Course[] courses){	System.out.println("请输入要删除课程的编号：");	String courseId=scan.next();	for(int i=0;i<courses.length;i++){	if(courses[i].getCourseId().equals(courseId)){	courses[i]=null;	}	}	} }

public class Student {	//设置Student类的属性	private String stuId; //学号	private String stuName; //姓名	private String sex; //性别	private String tel; //电话号码	private String address; //地址	private int age; //年龄	SelectCourse[] selCourse; //选修课程	//构造方法	Student(){	}	Student(String stuId,String stuName){	this.stuId=stuId;	this.stuName=stuName;	}	Student(String stuId,String stuName,String sex,String tel,String address,int age){	this(stuId,stuName); //this的用法	this.sex=sex;	this.tel=tel;	this.address=address; //地址	this.age=age;	}	public String getStuId() {	return stuId;	}	public void setStuId(String stuId) {	this.stuId = stuId;	}	//姓名属性封装	public String getStuName() {	return stuName;	}	public void setStuName(String stuName) {	this.stuName = stuName;	}	//性别属性封装	public String getSex() {	return sex;	}	public void setSex(String sex) {	this.sex = sex;	}	//电话属性封装	public String getTel() {	return tel;	}	public void setTel(String tel) {	this.tel = tel;	}	//地址属性封装	public String getAddress() {	return address;	}	public void setAddress(String address) {	this.address = address;	}	//年龄属性封装	public int getAge() {	return age;	}	public void setAge(int age) {	this.age = age;	}	//设置选修课程	public void setSelCourse(String[] cIds) { //cIds课程号数组 001,002	selCourse=new SelectCourse[cIds.length];	for(int j=0;j<cIds.length;j++){	selCourse[j]= new SelectCourse(cIds[j]);	}	}	//录入选修课程成绩	public void setSelCourseGrade(double[] grades) { //grades成绩数组	for(int j=0;j<grades.length;j++){	selCourse[j].grade= grades[j];	}	}	//计算学生各门课程的平均成绩	double getAvg(){	double sum=0;	for(int i=0;i<selCourse.length;i++){	sum=sum+selCourse[i].grade;	}	return sum/selCourse.length;	}	//计算学生各门课程的总和	double getSum(){	double sum=0;	for(int i=0;i<selCourse.length;i++){	sum=sum+selCourse[i].grade;	}	return sum;	}	//内部类，用来记录选修的课程及成绩	class SelectCourse{	String courseId;	double grade;	SelectCourse(){	}	SelectCourse(String courseId){	this.courseId=courseId;	}	SelectCourse(String courseId,double grade){	this.courseId=courseId;	this.grade=grade;	}	} }

public class Teacher {	//设置Teacher类的属性	private String teaId; //工号	private String teaName; //姓名	private String sex; //性别	private String tel; //电话	private String professor; //职称	private int age; //年龄	TeachCourse teachCourse[]; //所授课程	//构造方法	Teacher(){	}	Teacher(String teaId,String teaName){	this.teaId=teaId;	this.teaName=teaName;	}	Teacher(String teaId,String teaName,String sex,String tel,String professor,int age){	this(teaId,teaName); //this的用法	this.sex=sex;	this.tel=tel;	this.professor=professor; //地址	this.age=age;	}	//工号属性封装	public String getTeaId() {	return teaId;	}	public void setTeaId(String teaId) {	this.teaId = teaId;	}	//姓名属性封装	public String getTeaName() {	return teaName;	}	public void setTeaName(String teaName) {	this.teaName = teaName;	}	//性别属性封装	public String getSex() {	return sex;	}	public void setSex(String sex) {	this.sex = sex;	}	//电话属性封装	public String getTel() {	return tel;	}	public void setTel(String tel) {	this.tel = tel;	}	//职称属性封装	public String getProfessor() {	return professor;	}	public void setProfessor(String professor) {	this.professor = professor;	}	//年龄属性封装	public int getAge() {	return age;	}	public void setAge(int age) {	this.age = age;	}	//所授课程设置	public void setTeachCourse(String[] cIds) {	teachCourse=new TeachCourse[cIds.length];	for(int j=0;j<cIds.length;j++){	teachCourse[j]= new TeachCourse(cIds[j]);	}	}	//设置所授课程评价	public void setTeachEvaluate(String[] evaluates) { //grades成绩数组	for(int j=0;j<evaluates.length;j++){	teachCourse[j].evaluate= evaluates[j];	}	}	//内部类，教师所授课程	class TeachCourse{	String courseId; //课程编号	String evaluate; //课程评价	TeachCourse(String courseId){	this.courseId=courseId;	}	TeachCourse(String courseId,String evaluate){	this.courseId=courseId;	this.evaluate=courseId;	}	} }