组合模式(Composite)

最新推荐文章于 2025-06-15 23:18:55 发布

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本文通过具体的代码示例展示了UML类图的概念及其在软件设计中的应用。使用C#和Python实现了文档、文件及文件夹类，并演示了如何通过这些类构建文件系统的简单模型。

UML类图

代码实现：

    public abstract class Document
    {
        public string Name { get; set; }
        public abstract void Add(Document document);
        public abstract void Remove(Document document);
        public abstract void Display();
    }

    public class File : Document
    {
        public override void Add(Document document)
        {
            throw new NotImplementedException();
        }

        public override void Remove(Document document)
        {
            throw new NotImplementedException();
        }

        public override void Display()
        {
            throw new NotImplementedException();
        }
    }

    public class Folder : Document
    {
        private List<Document> documents = new List<Document>();

        public override void Add(Document document)
        {
            documents.Add(document);
        }

        public override void Remove(Document document)
        {
            documents.Remove(document);
        }

        public override void Display()
        {
            foreach (var document in documents)
            {
                Console.WriteLine(document.Name);
                document.Display();
            }
        }
    }

Python代码实现

class Doc(object):
    name = ""
    def Add(self, doc):
        raise NotImplementedError("abstract add")
    def Remove(self, doc):
        raise NotImplementedError("abstract remove")
    def Display(self):
        raise NotImplementedError("abstract remove")

class File(Doc):
    pass

class Folder(Doc):
    __docList = []
    def Add(self, doc):
        self.__docList.append(doc)
    def Remove(self, doc):
        self.__docList.remove(doc)
    def Display(self):
        for doc in self.__docList:
            print(doc.name)

if __name__ == "__main__":
    file1=File()
    file1.name="heihei.doc"
    
    file2=File()
    file2.name="hehe.csv"
    
    folder=Folder()
    folder.Add(file1)
    folder.Add(file2)
    
    folder.Display()