Form formPreview = new Form();
public Leaf(string name) : base(name) { }
public override void Add(Component c)
{
Console。
WriteLine("Cannot add to a leaf");
}
public override void Remove(Component c)
{
Console。
WriteLine("Cannot remove to a leaf");
}
public override void Display(int depth)
{
Console。
WriteLine(new string('-',depth) name);
}
}。
