golang实现简单工厂、方法工厂、抽象工厂三种设计模式

type Article interface {
	ReadArticle() string
	WriteArticle(contents string) string
}

type ChineseArticle struct{}
type EnglishArticle struct{}

func (c *ChineseArticle) ReadArticle() string {
	return "这是中文字符"
}
func (c *EnglishArticle) ReadArticle() string {
	return "this's English chars"
}
func (c *ChineseArticle) WriteArticle(contents string) string {
	return "写入了文章"
}
func (c *EnglishArticle) WriteArticle(contents string) string {
	return "wirted words"
}

func SFactory(lan string) (art Article) {
	switch lan {
	case "Chinese":
		art = &ChineseArticle{}
	case "English":
		art = &EnglishArticle{}
	default:
		art = &ChineseArticle{}
	}
	return art
}

func main() {
	a := SFactory("Chinese")//这样，我实例化中文书还是英文书都可以了
	fmt.Println(a.ReadArticle())
}

type Article interface {
	ReadArticle() string
	WriteArticle(contents string) string
}

type ChineseArticle struct{}
type EnglishArticle struct{}
//实现读写接口
func (c *ChineseArticle) ReadArticle() string {
	return "读书了"
}
func (c *EnglishArticle) ReadArticle() string {
	return "reading books"
}
func (c *ChineseArticle) WriteArticle(contents string) string {
	return "写书了"
}
func (c *EnglishArticle) WriteArticle(contents string) string {
	return "wirting books"
}

type CreateEnglish struct{}
type CreateChinese struct{}
//方法工厂的核心。
func (cdb *CreateEnglish) CreateArticle() (len *EnglishArticle, err error) {
	len = &EnglishArticle{}
	return len, nil
}
func (cdb *CreateChinese) CreateArticle() (len *ChineseArticle, err error) {
	len = &ChineseArticle{}
	return len, nil
}

func main() {
	a := &CreateChinese{}
	art, _ := a.CreateArticle()
	fmt.Println(art.WriteArticle("123"))
}

type BookCompany interface {
	Create() Book
}
type Book interface {
	ReadBook() string
	WriteBook() string
}

type EnglishBook struct{}
type ChineseBook struct{}
//实现book的功能
func (c *EnglishBook) ReadBook() string {
	return "reading a english book"
}
func (c *ChineseBook) ReadBook() string {
	return "读中文书"
}
func (c *EnglishBook) WriteBook() string {
	return "i'am writing"
}
func (c *ChineseBook) WriteBook() string {
	return "我在创作中"
}

type BeiJinCompany struct{}
type ShanghaiCompany struct{}
//一个印刷场刷英语书，一个刷中文书
func (c *BeiJinCompany) Create() Book {
	return &EnglishBook{}
}
func (c *ShanghaiCompany) Create() Book {
	return &ChineseBook{}
}

func main() {
	var f BookCompany
	f = new(BeiJinCompany)
	book := f.Create()
	fmt.Println(book.ReadBook())
}