static void Main(string[] args)
{
//设计模式: 装饰模式
//*通过组合而非继承的手法, 装饰模式实现了在运行时动态扩展对象功能的能力
//*可以根据需要扩展多个能力,避免了使用继承带来的'灵活性差'和'多子类衍生'问题
//*装饰模式应用要掉在于解决'主体类在多个方向上的扩展功能',是为'修饰'的含义
//☆一般'继承一个接口,内部又封装有该接口的字段'(is-a+has-a)为装饰模式的一个特征(不绝对)
//建立一个被修饰的对象, 圣诞树
ITree tree = new ChristmasTree();
//建立修饰者'给树加星星', 将要修饰的树传递进去
ITree scTree = new StarTree(tree);
//展示修饰后的树
scTree.Show();
//换行分割下输出结果
Console.WriteLine();
//给挂上星星的树再次挂上星星
ITree sscTree = new StarTree(scTree);
//展示挂了两次星星的树
sscTree.Show();
Console.ReadLine();
}
static void Main(string[] args)
{
Tree christmasTree = new ChristmasTree();
christmasTree = new ToysDecorator(christmasTree);
christmasTree = new GarlandDecorator(christmasTree);
christmasTree.Appearance();
}
static void Main(string[] args)
{
ChristmasTreeToy toy = new ChristmasTreeToy();
ChristmasTreeGarland garland = new ChristmasTreeGarland();
ChristmasTreeBranch branch = new ChristmasTreeBranch();
ChristmasTree tree = new ChristmasTree();
branch.SetDecoration(toy);
tree.SetDecoration(branch);
tree.Appearance();
branch.SetDecoration(garland);
tree.Appearance();
Console.Read();
}
public void SetChristmasTree(ChristmasTree christmasTree)
{
this.christmasTree = christmasTree;
}
