添加W5

W5/Person.java

@@ -0,0 +1,102 @@
+import java.util.ArrayList;
+import java.util.List;
+
+// 公共父类 Person
+class Person {
+    protected String id;
+    protected String name;
+    protected int age;
+
+    public Person(String id, String name, int age) {
+        this.id = id;
+        this.name = name;
+        this.age = age;
+    }
+
+    // 公共方法：展示基本信息
+    public void showInfo() {
+        System.out.println("ID: " + id + ", 姓名: " + name + ", 年龄: " + age);
+    }
+}
+
+// 子类 Student（学生）
+class Student extends Person {
+    private String studentNo; // 学号（特有属性）
+    private String major;     // 专业（特有属性）
+
+    public Student(String id, String name, int age, String studentNo, String major) {
+        super(id, name, age);
+        this.studentNo = studentNo;
+        this.major = major;
+    }
+
+    // 重写 showInfo，展示学生特有信息
+    @Override
+    public void showInfo() {
+        super.showInfo();
+        System.out.println("学号: " + studentNo + ", 专业: " + major);
+        System.out.println("------------------------");
+    }
+
+    // 学生特有方法
+    public String getStudentNo() {
+        return studentNo;
+    }
+}
+
+// 子类 Teacher（老师）
+class Teacher extends Person {
+    private String teacherNo; // 工号（特有属性）
+    private String department;// 院系（特有属性）
+
+    public Teacher(String id, String name, int age, String teacherNo, String department) {
+        super(id, name, age);
+        this.teacherNo = teacherNo;
+        this.department = department;
+    }
+
+    // 重写 showInfo，展示老师特有信息
+    @Override
+    public void showInfo() {
+        super.showInfo();
+        System.out.println("工号: " + teacherNo + ", 院系: " + department);
+        System.out.println("------------------------");
+    }
+
+    // 老师特有方法
+    public String getTeacherNo() {
+        return teacherNo;
+    }
+}
+
+// 管理类：用多态统一管理
+class PersonManager {
+    private List<Person> personList = new ArrayList<>();
+
+    // 统一添加方法：替代 addStudent 和 addTeacher
+    public void addPerson(Person p) {
+        // 1. 处理公共属性：直接通过父类引用操作
+        System.out.println("正在添加人员: " + p.name);
+
+        // 2. 处理子类特有属性：通过类型判断 + 向下转型
+        if (p instanceof Student) {
+            Student student = (Student) p;
+            System.out.println("学生学号: " + student.getStudentNo() + "，已录入学生信息");
+        } else if (p instanceof Teacher) {
+            Teacher teacher = (Teacher) p;
+            System.out.println("老师工号: " + teacher.getTeacherNo() + "，已录入老师信息");
+        }
+
+        // 3. 统一存入集合
+        personList.add(p);
+        System.out.println("添加成功！\n");
+    }
+
+    // 统一展示所有人员信息
+    public void showAllPersons() {
+        System.out.println("=== 所有人员信息 ===");
+        for (Person p : personList) {
+            p.showInfo(); // 多态调用：自动匹配子类的 showInfo
+        }
+    }
+}

W5/PersonSystemTest.java

@@ -0,0 +1,17 @@
+// 主类测试
+public class PersonSystemTest {
+    public static void main(String[] args) {
+        PersonManager manager = new PersonManager();
+
+        // 测试添加学生
+        Student student = new Student("P001", "张三", 20, "S2023001", "计算机科学与技术");
+        manager.addPerson(student);
+
+        // 测试添加老师
+        Teacher teacher = new Teacher("P002", "李四", 35, "T2020001", "计算机学院");
+        manager.addPerson(teacher);
+
+        // 展示所有信息
+        manager.showAllPersons();
+    }
+}