package main

import "fmt"

// Product 接口
type Product interface {
	Operation() string
}

// ConcreteProductA 结构体
type ConcreteProductA struct{}

func (p *ConcreteProductA) Operation() string {
	return "ConcreteProductA"
}

// ConcreteProductB 结构体
type ConcreteProductB struct{}

func (p *ConcreteProductB) Operation() string {
	return "ConcreteProductB"
}

// SimpleFactory 结构体
type SimpleFactory struct{}

func (f *SimpleFactory) CreateProduct(productType string) Product {
	switch productType {
	case "A":
		return &ConcreteProductA{}
	case "B":
		return &ConcreteProductB{}
	default:
		return nil
	}
}

func main() {
	factory := &SimpleFactory{}

	productA := factory.CreateProduct("A")
	fmt.Println(productA.Operation())

	productB := factory.CreateProduct("B")
	fmt.Println(productB.Operation())
}