diff --git a/w5/Bike.class b/w5/Bike.class
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diff --git a/w5/Car.class b/w5/Car.class
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diff --git a/w5/Circle.class b/w5/Circle.class
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diff --git a/w5/Rectangle.class b/w5/Rectangle.class
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diff --git a/w5/Shape.class b/w5/Shape.class
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diff --git a/w5/ShapeTest.java b/w5/ShapeTest.java
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+++ b/w5/ShapeTest.java
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+// 1. 定义父类 Shape
+class Shape {
+    // 父类的 draw() 方法，子类可以重写
+    public void draw() {
+        System.out.println("绘制通用图形");
+    }
+}
+
+// 2. 定义子类 Circle，继承 Shape，重写 draw()
+class Circle extends Shape {
+    @Override
+    public void draw() {
+        System.out.println("绘制圆形 ⭕");
+    }
+}
+
+// 3. 定义子类 Rectangle，继承 Shape，重写 draw()
+class Rectangle extends Shape {
+    @Override
+    public void draw() {
+        System.out.println("绘制矩形 🟦");
+    }
+}
+
+// 4. 主类，包含 drawShape 方法和 main 测试方法
+public class ShapeTest {
+    // 多态方法：接收 Shape 类型参数，调用其 draw()
+    public static void drawShape(Shape s) {
+        s.draw(); // 动态绑定：实际调用传入对象的 draw()
+    }
+
+    public static void main(String[] args) {
+        // 测试1：传入 Circle 对象
+        Shape circle = new Circle();
+        drawShape(circle);
+
+        // 测试2：传入 Rectangle 对象
+        Shape rectangle = new Rectangle();
+        drawShape(rectangle);
+
+        // 测试3：直接传入对象（更简洁）
+        drawShape(new Circle());
+        drawShape(new Rectangle());
+    }
+}
diff --git a/w5/VehicleTest.java b/w5/VehicleTest.java
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+++ b/w5/VehicleTest.java
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+// 抽象父类Vehicle
+abstract class Vehicle {
+    public abstract void run();
+}
+
+// 子类Car
+class Car extends Vehicle {
+    @Override
+    public void run() {
+        System.out.println("小汽车在公路上行驶");
+    }
+}
+
+// 子类Bike
+class Bike extends Vehicle {
+    @Override
+    public void run() {
+        System.out.println("自行车在非机动车道行驶");
+    }
+}
+
+// 子类Truck
+class Truck extends Vehicle {
+    @Override
+    public void run() {
+        System.out.println("卡车在货运道路行驶");
+    }
+}
+
+// 主类
+public class VehicleTest {
+    public static void main(String[] args) {
+        // 创建Vehicle数组，存放不同车辆
+        Vehicle[] vehicles = {
+            new Car(),
+            new Bike(),
+            new Truck()
+        };
+
+        // 遍历调用run()
+        System.out.println("=== 车辆行驶测试 ===");
+        for (Vehicle v : vehicles) {
+            v.run();
+        }
+    }
+}