go 1.4 逐行讲解展示多态

"""

package main

import (
"fmt"
)

// 指针
// 父类
type AnimalIF interface {
Sleep() // 睡觉
GetColor() string // 颜色
GetType() string // 种类
}

// 子类
type Cat struct {
color string // 颜色
}

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

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

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

}

// 子类
type Dog struct {
color string
}

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

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 //接口数据类型

//animal = &Cat{"Green"}
//
//animal.Sleep()
//animal.GetType()
//animal.GetColor()
//
//animal = &Dog{"Yellow"}
//
//animal.Sleep()
//animal.GetType()
//animal.GetColor()

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

showAnimal(&cat)
//showAnimal(&Dog)
dog := Dog{"Yellow"}
showAnimal(&dog)

}

+++++++++++++++++++++ 总结 ++++++++++++++++++++++++
/**
多态 ：有父类 ； 有子类 实现了所有父类的方法 ；有指向父类的指针
*/
"""