// 5. 主类，包含 main 方法进行测试
public class ShapeTest {
    public static void main(String[] args) {
        // 创建对象
        Shape1 circle = new Circle();
        Shape1 rectangle = new Rectangle();
        Shape1 generalShape = new Shape1();

        // 创建工具类对象
        ShapeDrawer drawer = new ShapeDrawer();

        // 调用 drawShape 方法，体现多态
        drawer.drawShape(generalShape);  // 输出：绘制形状
        drawer.drawShape(circle);        // 输出：绘制圆形
        drawer.drawShape(rectangle);     // 输出：绘制矩形
    }
}