diff --git a/w5 b/w5
new file mode 100644
index 0000000..c1f0201
--- /dev/null
+++ b/w5
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+// 定义Shape类
+abstract class Shape {
+    // draw方法，由子类重写
+    public abstract void draw();
+}
+
+// Circle子类
+class Circle extends Shape {
+    @Override
+    public void draw() {
+        System.out.println("画一个圆形 ⚪");
+    }
+}
+
+// Rectangle子类
+class Rectangle extends Shape {
+    @Override
+    public void draw() {
+        System.out.println("画一个矩形 ▭");
+    }
+}
+
+public class Main {
+    // 编写drawShape方法，接收Shape类型参数
+    public static void drawShape(Shape s) {
+        s.draw();  // 多态调用实际子类的draw方法
+    }
+
+    public static void main(String[] args) {
+        // 测试
+        Shape circle = new Circle();
+        Shape rectangle = new Rectangle();
+
+        drawShape(circle);     // 输出：画一个圆形 ⚪
+        drawShape(rectangle);  // 输出：画一个矩形 ▭
+    }
+}
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