diff --git a/W4/Shape.java b/W4/Shape.java
new file mode 100644
index 0000000..a77a78a
--- /dev/null
+++ b/W4/Shape.java
@@ -0,0 +1,38 @@
+public class Shape {
+    public void draw() {
+        System.out.println("绘制一个图形");
+    }
+
+    // 静态方法，用于测试多态
+    public static void drawShape(Shape s) {
+        s.draw();
+    }
+
+    public static void main(String[] args) {
+        System.out.println("--- 基础题测试 ---");
+
+        // 创建子类对象
+        Circle c = new Circle();
+        Rectangle r = new Rectangle();
+
+        // 调用测试方法，体现多态性
+        drawShape(c); // 输出: 绘制一个圆形
+        drawShape(r); // 输出: 绘制一个矩形
+    }
+}
+
+// 子类 Circle1，注意这里不要加 public
+class Circle extends Shape {
+    @Override
+    public void draw() {
+        System.out.println("绘制一个圆形");
+    }
+}
+
+// 子类 Rectangle1，注意这里不要加 public
+class Rectangle extends Shape {
+    @Override
+    public void draw() {
+        System.out.println("绘制一个矩形");
+    }
+}
diff --git a/scores.txt b/scores.txt
new file mode 100644
index 0000000..f39742e
--- /dev/null
+++ b/scores.txt
@@ -0,0 +1,9 @@
+1
+22
+33
+66
+55
+692
+11
+335
+555