Golang设计模式之工厂方法模式讲解和代码示例

package main
type iGun interface {
	setName(name string)
	setPower(power string)
	getName() string
	getPower() string
}

package main
type Gun struct {
	name  string
	power int
}
func (g *Gun) setName(name string) {
	g.name = name
}
func (g *Gun) setPower(power int) {
	g.power = power
}
func (g *Gun) getName() string {
	return g.name
}
func (g *Gun) getPower() int {
	return g.power
}

package main
type Ak47 struct {
	Gun
}
func newAk47() iGun {
	return &Ak47{
		Gun: Gun{
			name:  "AK47 gun",
			power: 4,
		},
	}
}

package main
type musket struct {
	Gun
}
func newMusket() iGun {
	return &musket{
		Gun: Gun{
			name:  "Musket gun",
			power: 1,
		},
	}
}

package main
import "fmt"
func getGun(gunType string) (iGun, error) {
	switch gunType {
	case "ak47":
		return newAk47(), nil
	case "nusket":
		return newMusket(), nil
	default:
		return nil, fmt.Errorf("Wrong gun type passed")
	}
}

package main
import "fmt"
func main() {
	ak47, _ := getGun("ak47")
	musket, _ := getGun("musket")
	printDetails(ak47)
	printDetails(musket)
}
func printDetails(g iGun) {
	fmt.Printf("Gun: %s", g.getName())
	fmt.Println()
	fmt.Printf("Power: %d", g.getPower())
	fmt.Println()
}