工厂模式

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简单工厂模式

type IHuman interface {
    Watch() string
}
type Man struct{}

func (t *Man) Watch() string {
    return "man"
}

type Woman struct{}

func (t *Woman) Watch() string {
    return "woman"
}

const (
    ManN = iota
    WomanN
)

func CreateHuman(id int) IHuman {
    switch id {
    case ManN:
        return new(Man)
    case WomanN:
        return new(Woman)
    }
    return nil
}

抽象工厂模式

设计模式原则-对修改关闭，多扩展开放

type IHuman interface {
    Watch() string
}
type Man struct{}

func (t *Man) Watch() string {
    return "man"
}

type Woman struct{}

func (t *Woman) Watch() string {
    return "woman"
}
type AbstractFactory interface {
    CreateHuman() IHuman
}
type ManFactory struct{}

func (f *ManFactory) CreateHuman() IHuman {
    return new(Man)
}

type WomanFactory struct{}

func (f *WomanFactory) CreateHuman() IHuman {
    return new(Woman)
}