go设计模式之简单工厂

package main

import "fmt"

// 手机类型枚举
type Brand int

const (
	Hawei Brand = 0
	Apple Brand = 1
	XM    Brand = 2
)

type Phone interface {
	ShowBrand()
}

// iphone
type IPhone struct {
}

func (p *IPhone) ShowBrand() {
  fmt.Println("我是苹果手机")
}

// 华为
type HPhone struct {
}

func (p *HPhone) ShowBrand() {
	fmt.Println("我是华为手机")
}

// 小米
type XPhone struct {
}

func (p *XPhone) ShowBrand() {
	fmt.Println("我是华为手机")
}

func NewPhone(brand Brand) Phone {
	switch brand {
	case Hawei:
		return &HPhone{}
	case Apple:
		return &IPhone{}
	case XM:
		return &XPhone{}
	default:
		return nil
	}
}

func main() {
	var phone Phone

	// 华为手机
	phone = NewPhone(Hawei)
	phone.ShowBrand()

	// 小米手机
	phone = NewPhone(XM)
	phone.ShowBrand()

	// 苹果手机
	phone = NewPhone(Apple)
	phone.ShowBrand()
}