java/w5/SchoolSystem.java

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

public class SchoolSystem {
    private List<Person> personList = new ArrayList<>();

    // 统一的 addPerson 方法，替代原来的 addStudent / addTeacher
    public void addPerson(Person p) {
        personList.add(p);
        System.out.println("Added: " + p);
    }

    public void listAll() {
        System.out.println("\n--- All Members ---");
        for (Person p : personList) {
            System.out.println(p);
        }
    }

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

        system.addPerson(new Student("Alice", 20, "S001", 3.8));
        system.addPerson(new Student("Bob",   19, "S002", 3.5));
        system.addPerson(new Teacher("Mr. Chen", 35, "Math", 10));
        system.addPerson(new Teacher("Ms. Li",   28, "English", 4));

        system.listAll();
    }
}