1
type Cat struct {
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  color string
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}
4

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func (this *Cat) Sleep() {
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  fmt.Println("Cat.Sleep()")
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}
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func (this *Cat) GetColor() string {
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  return this.color
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}
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func (this *Cat) GetType() string {
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  return "Cat"
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}
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15
// ===================
16

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type Dog struct {
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  color string
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}
20

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func (this *Dog) Sleep() {
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  fmt.Println("Dog.Sleep()")
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}
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func (this *Dog) GetColor() string {
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  return this.color
26
}
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func (this *Dog) GetType() string {
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  return "Dog"
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}

1
func showAnimal(animal Animal) {
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  animal.Sleep()
3
  fmt.Println("showAnimal.color:", animal.GetColor())
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  fmt.Println("showAnimal.type:", animal.GetType())
5
}
6

7
func main() {
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  // 多态
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  var animal Animal
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  animal = &Cat{"Yello"}
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  animal.Sleep() // Cat.Sleep()方法
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  fmt.Println(animal.GetColor())
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  fmt.Println(animal.GetType())
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  animal = &Dog{"Brown"}
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  animal.Sleep()
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  fmt.Println(animal.GetColor())
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  fmt.Println(animal.GetType())
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}
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-------------
21

22
Cat.Sleep()
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Yello
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Cat
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Dog.Sleep()
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Brown
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Dog
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showAnimal.color: white
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showAnimal.type: Cat