Java を使用して、学生のコース登録統計の結果を求める簡単なクエリ システム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 id;
    private List<String> courses;

    public Student(String name, String id, List<String> courses) {
        this.name = name;
        this.id = id;
        this.courses = courses;
    }

    // 省略getters和setters方法
}

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

public class CourseSelectionSystem {
    private List<Student> students;

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

    // 添加学生
    public void addStudent(Student student){
        students.add(student);
    }

    // 查询选课人数
    public int getCourseSelectionCount(String courseName){
        int count = 0;
        for(Student student : students){
            if(student.getCourses().contains(courseName)){
                count++;
            }
        }
        return count;
    }

    public static void main(String[] args){
        CourseSelectionSystem system = new CourseSelectionSystem();

        // 添加学生数据
        List<String> courses1 = new ArrayList<>();
        courses1.add("Math");
        courses1.add("English");
        Student student1 = new Student("张三", "001", courses1);

        List<String> courses2 = new ArrayList<>();
        courses2.add("Computer Science");
        courses2.add("English");
        Student student2 = new Student("李四", "002", courses2);

        List<String> courses3 = new ArrayList<>();
        courses3.add("Math");
        courses3.add("Physics");
        Student student3 = new Student("王五", "003", courses3);

        system.addStudent(student1);
        system.addStudent(student2);
        system.addStudent(student3);

        // 查询选课人数
        int count = system.getCourseSelectionCount("English");
        System.out.println("选修英语课程的人数为：" + count);
    }
}