用java编写:在两个类中实现统计某个班级的学生成绩

在Java中，我们可以创建两个类：`Student` 和 `Classroom` 来实现这个功能。`Student` 类表示学生，包含学生的姓名和成绩，而 `Classroom` 类则代表班级，包含学生的列表以及一些方法用于统计数据。

首先，我们定义`Student` 类：

public class Student {
    private String name;
    private double score;

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

    // getter and setter methods
    public String getName() { return name; }
    public void setName(String name) { this.name = name; }
    public double getScore() { return score; }
    public void setScore(double score) { this.score = score; }
}

接下来，我们定义`Classroom` 类，它有一个`List<Student>` 存储学生，同时提供计算平均分和总分的方法：

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

public class Classroom {
    private List<Student> students;

    public Classroom() {
        students = new ArrayList<>();
    }

    public void addStudent(Student student) {
        students.add(student);
    }

    public double calculateAverageScore() {
        double totalScore = 0;
        for (Student student : students) {
            totalScore += student.getScore();
        }
        return totalScore / students.size();
    }

    public double calculateTotalScore() {
        double totalScore = 0;
        for (Student student : students) {
            totalScore += student.getScore();
        }
        return totalScore;
    }

    // 其他可能需要的方法，如删除学生等...
}

现在，你可以创建 `Classroom` 对象，添加学生，然后调用其方法来计算平均分和总分。例如：

public class Main {
    public static void main(String[] args) {
        Classroom classroom = new Classroom();
        classroom.addStudent(new Student("张三", 85));
        classroom.addStudent(new Student("李四", 90));
        // 添加更多学生...

        double averageScore = classroom.calculateAverageScore();
        double totalScore = classroom.calculateTotalScore();

        System.out.printf("班级平均分: %.2f 分\n", averageScore);
        System.out.printf("班级总分: %.2f 分\n", totalScore);
    }
}