如何使用Java编写一个简单的学生选课时间冲突检测系统？

public class Course {
    private String courseId;
    private String courseName;
    private String courseTime;
    
    public Course(String courseId, String courseName, String courseTime) {
        this.courseId = courseId;
        this.courseName = courseName;
        this.courseTime = courseTime;
    }
    
    // Getter and setter methods
}

import java.util.ArrayList;
import java.util.List;

public class CourseSchedule {
    private List<Course> courses;
    
    public CourseSchedule() {
        this.courses = new ArrayList<>();
    }
    
    public void addCourse(Course course) {
        courses.add(course);
    }
    
    public boolean hasTimeConflict() {
        for (int i = 0; i < courses.size(); i++) {
            Course course1 = courses.get(i);
            for (int j = i + 1; j < courses.size(); j++) {
                Course course2 = courses.get(j);
                if (course1.getCourseTime().equals(course2.getCourseTime())) {
                    return true;
                }
            }
        }
        return false;
    }
}

public class Main {
    public static void main(String[] args) {
        Course course1 = new Course("C001", "数学", "周一 8:00-10:00");
        Course course2 = new Course("C002", "英语", "周一 9:00-11:00");
        Course course3 = new Course("C003", "计算机科学", "周一 10:00-12:00");
        
        CourseSchedule schedule = new CourseSchedule();
        schedule.addCourse(course1);
        schedule.addCourse(course2);
        schedule.addCourse(course3);
        
        if (schedule.hasTimeConflict()) {
            System.out.println("存在时间冲突");
        } else {
            System.out.println("不存在时间冲突");
        }
    }
}