上传文件至 'w5'

w5/Person.java

@@ -0,0 +1,21 @@
+public abstract class Person {
+    protected String name;
+    protected int age;
+
+    public Person(String name, int age) {
+        this.name = name;
+        this.age = age;
+    }
+
+    public String getName() { return name; }
+    public int getAge()     { return age; }
+
+    public abstract String getRole();
+    public abstract String getExtraInfo();
+
+    @Override
+    public String toString() {
+        return getRole() + " | Name: " + name + ", Age: " + age
+               + ", " + getExtraInfo();
+    }
+}

w5/SchoolSystem.java

@@ -0,0 +1,30 @@
+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();
+    }
+}

w5/Student.java

@@ -0,0 +1,18 @@
+public class Student extends Person {
+    private String studentId;
+    private double gpa;
+
+    public Student(String name, int age, String studentId, double gpa) {
+        super(name, age);
+        this.studentId = studentId;
+        this.gpa = gpa;
+    }
+
+    @Override
+    public String getRole() { return "Student"; }
+
+    @Override
+    public String getExtraInfo() {
+        return "ID: " + studentId + ", GPA: " + gpa;
+    }
+}

w5/Teacher.java

@@ -0,0 +1,18 @@
+public class Teacher extends Person {
+    private String subject;
+    private int yearsOfExperience;
+
+    public Teacher(String name, int age, String subject, int yearsOfExperience) {
+        super(name, age);
+        this.subject = subject;
+        this.yearsOfExperience = yearsOfExperience;
+    }
+
+    @Override
+    public String getRole() { return "Teacher"; }
+
+    @Override
+    public String getExtraInfo() {
+        return "Subject: " + subject + ", Experience: " + yearsOfExperience + " years";
+    }
+}