如何包含一个列表中的对象，即另一个对象中的对象？

public class Student {
    private String name;
    private int age;
    private List<Course> courses;

    // 构造函数和其他方法省略

    public void addCourse(Course course) {
        courses.add(course);
    }

    // Getters and setters省略
}

public class Course {
    private String name;
    private String teacher;

    // 构造函数和其他方法省略

    // Getters and setters省略
}

public class Main {
    public static void main(String[] args) {
        Course math = new Course("Math", "John");
        Course english = new Course("English", "Alice");

        Student student = new Student("Tom", 18);
        student.addCourse(math);
        student.addCourse(english);

        System.out.println("Student: " + student.getName());
        System.out.println("Age: " + student.getAge());
        System.out.println("Courses: ");
        for (Course course : student.getCourses()) {
            System.out.println(course.getName() + " - " + course.getTeacher());
        }
    }
}