From 7cbffd25cdff918082a0b455170fc78ce04bff23 Mon Sep 17 00:00:00 2001
From: Mengxinyao <ok@okdeMacBook-Air.local>
Date: Sun, 5 Apr 2026 00:34:10 +0800
Subject: [PATCH] =?UTF-8?q?feat(w4):W4-=E5=AD=9F=E9=91=AB=E5=9E=9A-2025060?=
 =?UTF-8?q?10204?=
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---
 w4/Shape | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 w4/Shape

diff --git a/w4/Shape b/w4/Shape
new file mode 100644
index 0000000..6698569
--- /dev/null
+++ b/w4/Shape
@@ -0,0 +1,38 @@
+// Shape 类（父类）
+abstract class Shape {
+    public abstract void draw(); // 抽象方法，子类必须实现
+}
+
+// Circle 类（继承 Shape）
+class Circle extends Shape {
+    @Override
+    public void draw() {
+        System.out.println("绘制圆形");
+    }
+}
+
+// Rectangle 类（继承 Shape）
+class Rectangle extends Shape {
+    @Override
+    public void draw() {
+        System.out.println("绘制矩形");
+    }
+}
+
+// 测试类
+public class TestShape {
+    // 方法：接收 Shape 对象并调用其 draw 方法
+    public static void drawShape(Shape s) {
+        s.draw();
+    }
+
+    public static void main(String[] args) {
+        // 创建不同形状对象
+        Shape circle = new Circle();
+        Shape rectangle = new Rectangle();
+
+        // 调用 drawShape 方法测试多态
+        drawShape(circle);      // 输出：绘制圆形
+        drawShape(rectangle);   // 输出：绘制矩形
+    }
+}
\ No newline at end of file