1export class Student {
2    name: string;
3    age: number;
4    grade: number;
5    constructor(name: string, age: number, grade: number) {
6        this.name = name;
7        this.age = age;
8        this.grade = grade;
9    }
10    introduce() {
11    }
12}
13class Classroom {
14    className: string;
15    students: Student[];
16    constructor(className: string, students: Student[]) {
17        this.className = className;
18        this.students = students;
19    }
20    listStudents() {
21        this.students.forEach(student => {
22        });
23    }
24}
25const student1 = new Student('Alice', 15, 9);
26const student2 = new Student('Bob', 14, 8);
27const student3 = new Student('Charlie', 16, 10);
28const classroom = new Classroom('Class A', [student1, student2, student3]);
29classroom.listStudents();
30