Golang接口實現多態

package main import ( "fmt" ) func main() { user := &User{name: "Chris"} user.ISubUser = &NormalUser{} user.sayHi() user.ISubUser = &ArtisticUser{} user.sayHi() } type ISubUser interface { sayType() } type User struct { name string ISubUser } func (u *User) sayHi() { u.sayName() u.sayType() } func (u *User) sayName() { fmt.Printf("I am %s.", u.name) } type NormalUser struct { } func (n *NormalUser) sayType() { fmt.Println("I am a normal user.") } type ArtisticUser struct { } func (a *ArtisticUser) sayType() { fmt.Println("I am an artistic user.") }
//RUN 之后輸出：

I am Chris.I am a normal user.
I am Chris.I am a artistic user.
//重用了sayName和sayHi方法，sayType方法可以多態來實現。