diff --git a/W5/ShapeTest.java b/W5/ShapeTest.java
new file mode 100644
index 0000000..87ac2c8
--- /dev/null
+++ b/W5/ShapeTest.java
@@ -0,0 +1,39 @@
+// 图形父类
+class Shape {
+    public void draw() {
+        System.out.println("绘制图形");
+    }
+}
+
+// 圆形子类
+class Circle extends Shape {
+    @Override
+    public void draw() {
+        System.out.println("绘制圆形");
+    }
+}
+
+// 矩形子类
+class Rectangle extends Shape {
+    @Override
+    public void draw() {
+        System.out.println("绘制矩形");
+    }
+}
+
+// 测试主类
+public class ShapeTest {
+
+    // 题目要求的方法
+    public static void drawShape(Shape s) {
+        s.draw();
+    }
+
+    public static void main(String[] args) {
+        Shape c = new Circle();
+        Shape r = new Rectangle();
+
+        drawShape(c);
+        drawShape(r);
+    }
+}
diff --git a/W5/VehicleTest.java b/W5/VehicleTest.java
new file mode 100644
index 0000000..1866736
--- /dev/null
+++ b/W5/VehicleTest.java
@@ -0,0 +1,48 @@
+// 抽象父类 交通工具
+abstract class Vehicle {
+    // 抽象方法
+    public abstract void run();
+}
+
+// 小汽车
+class Car extends Vehicle {
+    @Override
+    public void run() {
+        System.out.println("小汽车在公路上行驶");
+    }
+}
+
+// 自行车
+class Bike extends Vehicle {
+    @Override
+    public void run() {
+        System.out.println("自行车在慢慢骑行");
+    }
+}
+
+// 卡车
+class Truck extends Vehicle {
+    @Override
+    public void run() {
+        System.out.println("卡车在运输货物");
+    }
+}
+
+// 主类
+public class VehicleTest {
+    public static void main(String[] args) {
+
+        // 创建 Vehicle 数组，存放不同子类对象（多态）
+        Vehicle[] vehicles = {
+                new Car(),
+                new Bike(),
+                new Truck()
+        };
+
+        // 遍历数组，调用 run() 方法
+        System.out.println("===== 所有交通工具开始运行 =====");
+        for (Vehicle v : vehicles) {
+            v.run();
+        }
+    }
+}
\ No newline at end of file