上传文件至 'w5'

w5/ShapeDemo.java

@@ -0,0 +1,40 @@
+class Shape {
+    public void draw() {
+        System.out.println("Drawing a shape");
+    }
+}
+
+class Circle extends Shape {
+    @Override
+    public void draw() {
+        System.out.println("Drawing a circle");
+    }
+}
+
+class Rectangle extends Shape {
+    @Override
+    public void draw() {
+        System.out.println("Drawing a rectangle");
+    }
+}
+
+public class ShapeDemo {
+    public static void drawShape(Shape s) {
+        s.draw();
+    }
+    
+    public static void main(String[] args) {
+        Shape shape = new Shape();
+        Circle circle = new Circle();
+        Rectangle rectangle = new Rectangle();
+        
+        System.out.println("Testing Shape:");
+        drawShape(shape);
+        
+        System.out.println("\nTesting Circle:");
+        drawShape(circle);
+        
+        System.out.println("\nTesting Rectangle:");
+        drawShape(rectangle);
+    }
+}