用java写一个教学管理系统

由于教学管理系统的具体功能和需求有很多种，因此这里提供一个简单的教学管理系统的代码示例，仅供参考。

首先，我们需要定义一些基本的实体类，如学生、教师、课程等：

public class Student {
    private int id;
    private String name;
    private int age;
    private String gender;
    private String major;
    
    // 构造函数、getters和setters省略
}

public class Teacher {
    private int id;
    private String name;
    private int age;
    private String gender;
    private String department;
    
    // 构造函数、getters和setters省略
}

public class Course {
    private int id;
    private String name;
    private int credit;
    private Teacher teacher;
    private List<Student> students;
    
    // 构造函数、getters和setters省略
}

然后，我们需要定义一个教学管理系统的类，包含一些基本的功能，如添加学生、删除学生、添加教师、删除教师、添加课程、删除课程等：

public class TeachingManagementSystem {
    private List<Student> students;
    private List<Teacher> teachers;
    private List<Course> courses;
    
    public TeachingManagementSystem() {
        students = new ArrayList<>();
        teachers = new ArrayList<>();
        courses = new ArrayList<>();
    }
    
    // 添加学生
    public void addStudent(Student student) {
        students.add(student);
    }
    
    // 删除学生
    public void removeStudent(int id) {
        for (Student student : students) {
            if (student.getId() == id) {
                students.remove(student);
                return;
            }
        }
    }
    
    // 添加教师
    public void addTeacher(Teacher teacher) {
        teachers.add(teacher);
    }
    
    // 删除教师
    public void removeTeacher(int id) {
        for (Teacher teacher : teachers) {
            if (teacher.getId() == id) {
                teachers.remove(teacher);
                return;
            }
        }
    }
    
    // 添加课程
    public void addCourse(Course course) {
        courses.add(course);
    }
    
    // 删除课程
    public void removeCourse(int id) {
        for (Course course : courses) {
            if (course.getId() == id) {
                courses.remove(course);
                return;
            }
        }
    }
    
    // 选课
    public void addStudentToCourse(int studentId, int courseId) {
        for (Student student : students) {
            if (student.getId() == studentId) {
                for (Course course : courses) {
                    if (course.getId() == courseId) {
                        course.getStudents().add(student);
                        return;
                    }
                }
            }
        }
    }
    
    // 退课
    public void removeStudentFromCourse(int studentId, int courseId) {
        for (Course course : courses) {
            if (course.getId() == courseId) {
                for (Student student : course.getStudents()) {
                    if (student.getId() == studentId) {
                        course.getStudents().remove(student);
                        return;
                    }
                }
            }
        }
    }
    
    // 列出所有学生
    public List<Student> listStudents() {
        return students;
    }
    
    // 列出所有教师
    public List<Teacher> listTeachers() {
        return teachers;
    }
    
    // 列出所有课程
    public List<Course> listCourses() {
        return courses;
    }
}

最后，我们可以在主函数中测试教学管理系统的功能：

public static void main(String[] args) {
    TeachingManagementSystem tms = new TeachingManagementSystem();
    
    // 添加学生
    Student s1 = new Student(1, "张三", 18, "男", "计算机科学与技术");
    tms.addStudent(s1);
    Student s2 = new Student(2, "李四", 19, "女", "软件工程");
    tms.addStudent(s2);
    
    // 添加教师
    Teacher t1 = new Teacher(1, "王老师", 35, "男", "计算机科学与技术");
    tms.addTeacher(t1);
    
    // 添加课程
    Course c1 = new Course(1, "Java程序设计", 3, t1, new ArrayList<>());
    tms.addCourse(c1);
    
    // 选课
    tms.addStudentToCourse(1, 1);
    
    // 列出所有学生
    List<Student> students = tms.listStudents();
    for (Student student : students) {
        System.out.println(student.getName());
    }
    
    // 列出所有教师
    List<Teacher> teachers = tms.listTeachers();
    for (Teacher teacher : teachers) {
        System.out.println(teacher.getName());
    }
    
    // 列出所有课程
    List<Course> courses = tms.listCourses();
    for (Course course : courses) {
        System.out.println(course.getName());
    }
}