diff --git a/w5/DrawCircle.class b/w5/DrawCircle.class
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diff --git a/w5/DrawCircle.java b/w5/DrawCircle.java
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--- /dev/null
+++ b/w5/DrawCircle.java
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+public class DrawCircle extends DrawShape {
+    @Override
+    public void draw() {
+        System.out.println("绘制圆形 O");
+    }
+}
diff --git a/w5/DrawRectangle.class b/w5/DrawRectangle.class
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diff --git a/w5/DrawRectangle.java b/w5/DrawRectangle.java
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+++ b/w5/DrawRectangle.java
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+public class DrawRectangle extends DrawShape {
+    @Override
+    public void draw() {
+        System.out.println("绘制矩形 □");
+    }
+}
diff --git a/w5/DrawShape.class b/w5/DrawShape.class
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diff --git a/w5/DrawShape.java b/w5/DrawShape.java
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+++ b/w5/DrawShape.java
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+public class DrawShape {
+    public void draw() {
+        System.out.println("绘制形状");
+    }
+}
diff --git a/w5/ShapeTest.class b/w5/ShapeTest.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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+public class ShapeTest {
+    public static void drawShape(DrawShape s) {
+        s.draw();
+    }
+
+    public static void main(String[] args) {
+        DrawShape circle = new DrawCircle();
+        DrawShape rectangle = new DrawRectangle();
+
+        drawShape(circle);
+        drawShape(rectangle);
+    }
+}