static void Main(string[] args)
{
Component root = new Composite("目录");
Component music = new Composite("音乐");
Component knowledge = new Composite("知识");
Component life = new Composite("生活");
root.Add(music);
root.Add(knowledge);
root.Add(life);
Component science = new Composite("科学科普");
Component tech = new Composite("野生技术协会");
knowledge.Add(science);
knowledge.Add(tech);
Component scienceArticle1 = new Leaf("科学科普文章1");
Component scienceArticle2 = new Leaf("科学科普文章2");
science.Add(scienceArticle1);
science.Add(scienceArticle2);
Component shoot = new Composite("摄影");
Component program = new Composite("编程");
Component english = new Composite("英语");
tech.Add(shoot);
tech.Add(program);
tech.Add(english);
Component shootArticle1 = new Leaf("摄影文章1");
Component lifeArticle1 = new Leaf("生活文章1");
Component lifeArticle2 = new Leaf("生活文章2");
shoot.Add(shootArticle1);
life.Add(lifeArticle1);
life.Add(lifeArticle2);
tech.Remove(program);
knowledge.Display(0);
Console.WriteLine("文章数：" + knowledge.SumArticleCount());
}
