package main

import "fmt"

// 本质是一个指针
type AnimalIF interface {
	Sleep()
	GetColor() string // 获取颜色
	GetType() string  // 获取种类
}

// 定义具体的类
type Cat struct {
	color string // 颜色
}

func (this *Cat) Sleep() {
	fmt.Println("Cat is sleep")
}

func (this *Cat) GetColor() string {
	return this.color
}

func (this *Cat) GetType() string {
	return "Cat"
}

type Dog struct {
	color string
}

func (this *Dog) Sleep() {
	fmt.Println("Dog is sleep")
}

func (this *Dog) GetColor() string {
	return this.color
}

func (this *Dog) GetType() string {
	return "Dog"
}

func showAnimal(animal AnimalIF) {
	animal.Sleep()
	fmt.Println("color = ", animal.GetColor())
	fmt.Println("type = ", animal.GetType())
}

func main() {
	var animal AnimalIF // 接口数据类型（父类指针）
	animal = &Cat{"green"}
	animal.Sleep()
	animal = &Dog{"yellow"}
	animal.Sleep()

	cat := Cat{"gray"}
	dog := Dog{"black"}
	showAnimal(&cat)
	showAnimal(&dog)
}