多态

package main

import "fmt"

//本质是一个指针
type AnimalIF interface {
   Sleep()
   GetColor() string //获取动物的颜色
   GetType() string  //获取动物的种类
}

//具体的类
type Cat struct {
   color string //猫的颜色
}

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

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

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

//具体的类
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() //多态
   fmt.Println("color = ", animal.GetColor())
   fmt.Println("kind = ", animal.GetType())
}

func main() {

   var animal AnimalIF //接口的数据类型， 父类指针
   animal = &Cat{"Green"}

   animal.Sleep() //调用的就是Cat的Sleep()方法 , 多态的现象

   animal = &Dog{"Yellow"}

   animal.Sleep() // 调用Dog的Sleep方法，多态的现象

   cat := Cat{"Green"}
   dog := Dog{"Yellow"}

   showAnimal(&cat)
   showAnimal(&dog)
}