public class ShapeTest {
    public static void drawShape(Shape s) {
        s.draw();
    }
    
    public static void main(String[] args) {
        // 创建形状对象
        Shape myShape = new Shape();
        Shape myCircle = new Circle();
        Shape myRectangle = new Rectangle();
        
        // 测试 drawShape 方法
        System.out.println("测试 Shape 基类:");
        drawShape(myShape);
        
        System.out.println("\n测试 Circle 子类:");
        drawShape(myCircle);
        
        System.out.println("\n测试 Rectangle 子类:");
        drawShape(myRectangle);
    }
}