diff --git a/w5/ShapeTest.java b/w5/ShapeTest.java
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index 0000000..fb81b50
--- /dev/null
+++ b/w5/ShapeTest.java
@@ -0,0 +1,33 @@
+// 抽象父类 Shape
+ abstract class Shape {
+     // 抽象方法，由子类实现
+     public abstract void draw();
+ }
+ // 子类 Circle
+ class Circle extends Shape {
+     @Override
+     public void draw() {
+         System.out.println("绘制圆形");
+     }
+ }
+ // 子类 Rectangle
+ class Rectangle extends Shape {
+     @Override
+     public void draw() {
+         System.out.println("绘制矩形");
+     }
+ }
+ // 工具类/主类
+ public class ShapeTest {
+     // 统一绘制方法，利用多态
+     public static void drawShape(Shape s) {
+         s.draw(); // 动态绑定，自动调用对应子类的draw()
+     }
+     public static void main(String[] args) {
+         // 测试多态
+         Shape circle = new Circle();
+         Shape rectangle = new Rectangle();
+         drawShape(circle);    // 输出：绘制圆形
+         drawShape(rectangle); // 输出：绘制矩形
+     }
+ }
\ No newline at end of file
diff --git a/w5/屏幕截图 2026-04-13 121146.png b/w5/屏幕截图 2026-04-13 121146.png
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