From bedf93ddb5868e6d9a60b009e63e1d0f336c72d8 Mon Sep 17 00:00:00 2001
From: WangHe <2260378191@qq.com>
Date: Fri, 10 Apr 2026 13:45:44 +0800
Subject: [PATCH] =?UTF-8?q?=E4=B8=8A=E4=BC=A0=E6=96=87=E4=BB=B6=E8=87=B3?=
 =?UTF-8?q?=20'w5'?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 w5/Shape.java     | 20 ++++++++++++++++++++
 w5/TestShape.java | 18 ++++++++++++++++++
 2 files changed, 38 insertions(+)
 create mode 100644 w5/Shape.java
 create mode 100644 w5/TestShape.java

diff --git a/w5/Shape.java b/w5/Shape.java
new file mode 100644
index 0000000..cad5e14
--- /dev/null
+++ b/w5/Shape.java
@@ -0,0 +1,20 @@
+class Shape {
+    public void draw() {
+        System.out.println("绘制一个形状");
+    }
+}
+
+class Circle extends Shape {
+    @Override
+    public void draw() {
+        System.out.println("绘制一个圆形 ○");
+    }
+}
+
+class Rectangle extends Shape {
+    @Override
+    public void draw() {
+        System.out.println("绘制一个矩形 ▭");
+    }
+}
+
diff --git a/w5/TestShape.java b/w5/TestShape.java
new file mode 100644
index 0000000..6137625
--- /dev/null
+++ b/w5/TestShape.java
@@ -0,0 +1,18 @@
+// 测试类
+public class TestShape {
+    // 多态方法：接收父类引用，实际调用子类重写的方法
+    public static void drawShape(Shape s) {
+        s.draw();  // 这里发生多态
+    }
+
+    public static void main(String[] args) {
+        Shape s1 = new Circle();     // 向上转型
+        Shape s2 = new Rectangle();
+
+        drawShape(s1);  // 输出：绘制一个圆形 ○
+        drawShape(s2);  // 输出：绘制一个矩形 ▭
+
+        // 直接用子类对象也可以
+        drawShape(new Circle());
+    }
+}
\ No newline at end of file