work/Grade.java

package basic;

/**
 * 成绩类，实现学生与成绩的一对多关联关系，同时与课程建立多对一关系
 */
public class Grade {
    private int id;
    private double score;
    
    // 所属学生（多对一关系）
    private Student student;
    
    // 所属课程（多对一关系）
    private Course course;
    
    public Grade(int id, Course course, double score) {
        this.id = id;
        this.course = course;
        this.score = score;
    }
    
    // 设置学生
    public void setStudent(Student student) {
        this.student = student;
    }
    
    // Getters and Setters
    public int getId() {
        return id;
    }
    
    public void setId(int id) {
        this.id = id;
    }
    
    public double getScore() {
        return score;
    }
    
    public void setScore(double score) {
        this.score = score;
    }
    
    public Student getStudent() {
        return student;
    }
    
    public Course getCourse() {
        return course;
    }
    
    public void setCourse(Course course) {
        this.course = course;
    }
}