以上面为题编写代码
时间: 2023-07-02 11:11:46 浏览: 78
好的,以下是可能的代码实现:
先是Student类:
```java
public class Student {
private String name;
private int age;
private String gender;
private String id;
public Student(String name, int age, String gender, String id) {
this.name = name;
this.age = age;
this.gender = gender;
this.id = id;
}
// getters and setters
}
```
然后是Course类:
```java
public class Course {
private String name;
private String id;
private int credit;
public Course(String name, String id, int credit) {
this.name = name;
this.id = id;
this.credit = credit;
}
// getters and setters
}
```
接着是CourseManager接口:
```java
public interface CourseManager {
void addCourse(Course course);
void removeCourse(String id);
Course findCourse(String id);
}
```
然后是CourseManagerImp1类,它实现了CourseManager接口:
```java
import java.util.ArrayList;
import java.util.List;
public class CourseManagerImp1 implements CourseManager {
private List<Course> courses;
public CourseManagerImp1() {
courses = new ArrayList<>();
}
@Override
public void addCourse(Course course) {
courses.add(course);
}
@Override
public void removeCourse(String id) {
for (Course course : courses) {
if (course.getId().equals(id)) {
courses.remove(course);
break;
}
}
}
@Override
public Course findCourse(String id) {
for (Course course : courses) {
if (course.getId().equals(id)) {
return course;
}
}
return null;
}
}
```
接着是StudentManager类,它包含了添加学生及其选课、删除学生选课、查询学生选课情况和修改学生信息等基本操作:
```java
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class StudentManager {
private Map<String, Student> students;
public StudentManager() {
students = new HashMap<>();
}
public void addStudent(Student student, List<Course> courses) {
students.put(student.getId(), student);
for (Course course : courses) {
List<Course> studentCourses = students.get(student.getId()).getCourses();
studentCourses.add(course);
}
}
public void removeCourse(String studentId, String courseId) {
List<Course> studentCourses = students.get(studentId).getCourses();
for (Course course : studentCourses) {
if (course.getId().equals(courseId)) {
studentCourses.remove(course);
break;
}
}
}
public Student findStudent(String id) {
return students.get(id);
}
public void modifyStudent(Student student) {
students.put(student.getId(), student);
}
}
```
最后是一个使用例子:
```java
public class Main {
public static void main(String[] args) {
CourseManager courseManager = new CourseManagerImp1();
Course course1 = new Course("Math", "1", 4);
Course course2 = new Course("English", "2", 2);
courseManager.addCourse(course1);
courseManager.addCourse(course2);
Student student = new Student("Tom", 18, "male", "1001");
StudentManager studentManager = new StudentManager();
studentManager.addStudent(student, List.of(course1));
studentManager.modifyStudent(new Student("Tommy", 19, "male", "1001"));
studentManager.addStudent(new Student("Jerry", 20, "female", "1002"), List.of(course2));
studentManager.removeCourse("1001", "1");
Student findStudent = studentManager.findStudent("1002");
System.out.println(findStudent.getName() + " has selected courses:");
for (Course course : findStudent.getCourses()) {
System.out.println(course.getName());
}
}
}
```
以上代码可能还可以优化,比如加入异常处理、输入验证等等,但是总体来说,这个例子可以展示这些类和接口的基本用法。