好像Main主函数没有调用 getGrade() 获取班级，所以。。。
class PrimaryStudent extends Student {
private int grade;
public PrimaryStudent(String name, int age, int score, int grade){
super(name, age, score);
this.grade = grade;
}
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好像Main主函数没有调用 getGrade() 获取班级，所以。。。
class PrimaryStudent extends Student {
private int grade;
public PrimaryStudent(String name, int age, int score, int grade){
super(name, age, score);
this.grade = grade;
}
}