diff --git a/w5 b/w5
new file mode 100644
index 0000000..5196371
--- /dev/null
+++ b/w5
@@ -0,0 +1,47 @@
+// 抽象父类 Vehicle
+abstract class Vehicle {
+    // 抽象方法 run()，没有方法体，强制子类实现
+    public abstract void run();
+}
+
+// 子类 Car
+class Car extends Vehicle {
+    @Override
+    public void run() {
+        System.out.println("小汽车在公路上飞驰 🚗");
+    }
+}
+
+// 子类 Bike
+class Bike extends Vehicle {
+    @Override
+    public void run() {
+        System.out.println("自行车在非机动车道骑行 🚲");
+    }
+}
+
+// 子类 Truck
+class Truck extends Vehicle {
+    @Override
+    public void run() {
+        System.out.println("卡车在货运道路运输 🚚");
+    }
+}
+
+// 测试类
+public class VehicleTest {
+    public static void main(String[] args) {
+        System.out.println("\n=== 进阶题测试 ===");
+        // 1. 创建 Vehicle 数组，存放不同子类对象（多态数组）
+        Vehicle[] vehicles = {
+                new Car(),
+                new Bike(),
+                new Truck()
+        };
+
+        // 2. 遍历数组，统一调用 run() 方法，自动触发对应子类的实现
+        for (Vehicle v : vehicles) {
+            v.run();
+        }
+    }
+}
\ No newline at end of file