static void Main(string[] args)
{
try
{
Graphical zhengfangxing = GraphicalFactory.CreatGraphical("正方形");
Console.WriteLine("正方形的面积为：" + zhengfangxing.showacreage());
Graphical changfangxing = GraphicalFactory.CreatGraphical("长方形");
Console.WriteLine("长方形的面积为：" + changfangxing.showacreage());
Graphical yuanxing = GraphicalFactory.CreatGraphical("圆形");
Console.WriteLine("圆形的面积为：" + yuanxing.showacreage());
Graphical sanjiaoxing = GraphicalFactory.CreatGraphical("三角形");
Console.WriteLine("三角形的面积为：" + sanjiaoxing.showacreage());
}
catch (Exception ex)
{
Console.WriteLine("您输入有错：" + ex.Message);
}
}
public static Graphical CreatGraphical(string type)
{
Graphical n = null;
switch (type)
{
case "长方形":
n = new Rctangle();
break;
case "正方形":
n = new Square();
break;
case "圆形":
n = new Circular();
break;
case "三角形":
n = new Triangle();
break;
}
return(n);
}
