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简单工厂模式

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type sayer interface {
    say()
}

type man struct{

}

func (m *man)say(){
    fmt.Printf("I am man")
}

type woman struct{

}

func (w *woman)say(){
    fmt.Printf("I am woman")
}

func factory(t string) sayer{
    if t=="man" {
        return &man{}
    }else{
        return &woman{}
    }
}

func main(){
    s := factory("man")
    s.say()
}