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()); }