Java を使用して簡単な生徒の成績レポート ジェネレーターを作成するにはどうすればよいですか?

public class Student {
    private String name;
    private String studentId;

    public Student(String name, String studentId) {
        this.name = name;
        this.studentId = studentId;
    }

    public String getName() {
        return name;
    }

    public String getStudentId() {
        return studentId;
    }
}

public class Grade {
    private double mathGrade;
    private double englishGrade;
    // 可以按需增加其他科目的成绩

    public Grade(double mathGrade, double englishGrade) {
        this.mathGrade = mathGrade;
        this.englishGrade = englishGrade;
    }

    public double getMathGrade() {
        return mathGrade;
    }

    public double getEnglishGrade() {
        return englishGrade;
    }
}

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

public class GradeReportGenerator {
    private ArrayList<Student> students;
    private HashMap<Student, Grade> studentGrades;

    public GradeReportGenerator() {
        students = new ArrayList<>();
        studentGrades = new HashMap<>();
    }

    public void addStudent(Student student, Grade grade) {
        students.add(student);
        studentGrades.put(student, grade);
    }

    public void generateReport() {
        for (Student student : students) {
            Grade grade = studentGrades.get(student);
            double averageGrade = (grade.getMathGrade() + grade.getEnglishGrade()) / 2;

            System.out.println("学生姓名：" + student.getName());
            System.out.println("学号：" + student.getStudentId());
            System.out.println("数学成绩：" + grade.getMathGrade());
            System.out.println("英语成绩：" + grade.getEnglishGrade());
            System.out.println("平均成绩：" + averageGrade);
            System.out.println("--------------------------");
        }
    }
}

public class Main {
    public static void main(String[] args) {
        GradeReportGenerator generator = new GradeReportGenerator();

        Student student1 = new Student("张三", "2021001");
        Grade grade1 = new Grade(94.5, 88.0);
        generator.addStudent(student1, grade1);

        Student student2 = new Student("李四", "2021002");
        Grade grade2 = new Grade(87.0, 78.5);
        generator.addStudent(student2, grade2);

        generator.generateReport();
    }
}

学生姓名：张三
学号：2021001
数学成绩：94.5
英语成绩：88.0
平均成绩：91.25
--------------------------
学生姓名：李四
学号：2021002
数学成绩：87.0
英语成绩：78.5
平均成绩：82.75
--------------------------