Delete 'Grade.java'

Grade.java

@@ -1,55 +0,0 @@
-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;
-    }
-}