public void Visit(UseRectangle rectangle)
{
rectangle.CalculatedArea();
Console.WriteLine($"长方形长是：{rectangle._long}");
Console.WriteLine($"长方形宽是：{rectangle._wide}");
Console.WriteLine($"长方形周长是：{2*(rectangle._long+rectangle._wide)}");
}
public UseGraphical()
{
UseElement element = new UseRectangle(10, 5);
UseElement element1 = new UseCircular(5);
elements.Add(element);
elements.Add(element1);
}