public class ShapeUtil {
    public static void printArea(Shape shape) {
        if (shape == null) {
            System.out.println("错误：图形对象为空");
            return;
        }

        System.out.println("图形类型：" + shape.getShapeName());
        System.out.println("面积：" + shape.getArea());
        System.out.println("------------------------");
    }
}