Go的多态(Polymorphism) 是怎么实现的？

这几天查资料下面的代码写的很容易看懂。

看代码吧。不多解释了.

package mainimport "fmt"type AnimalIF interface {    Sleep()    Age() int    Type() string}type Animal struct {    MaxAge int}/*=======================================================*/type Cat struct {    Animal Animal}func (this *Cat) Sleep() {    fmt.Println("Cat need sleep")}func (this *Cat) Age() int {    return this.Animal.MaxAge}func (this *Cat) Type() string {    return "Cat"}/*=======================================================*/type Dog struct {    Animal Animal}func (this *Dog) Sleep() {    fmt.Println("Dog need sleep")}func (this *Dog) Age() int {    return this.Animal.MaxAge}func (this *Dog) Type() string {    return "Dog"}/*=======================================================*/func Factory(name string) AnimalIF {    switch name {    case "dog":        return &Dog{Animal{MaxAge: 20}}    case "cat":        return &Cat{Animal{MaxAge: 10}}    default:        panic("No such animal")    }}/*======================================================*/func main() {    animal := Factory("dog")    animal.Sleep()    fmt.Printf("%s max age is: %d", animal.Type(), animal.Age())}

> Output:Dog need sleepDog max age is: 20