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;			
		}
	}
}