package main import "fmt" type Animal interface { run() walk() } type Dog struct { Id int } func (dog Dog) run() { fmt.Printf("I am Dog,I can Run! ") } func (dog Dog) walk(){ fmt.Printf("I am Dog,I can walk! ") } type Pig struct { Id int } func (pig Pig) run() { fmt.Printf("I am Pig,I can Run! ") } func main() { dog := Dog{100} var animal0 interface{} = dog if _, ok := animal0.(Animal); ok { fmt.Printf("animal0 implement Animal interface! ") }else { fmt.Printf("animal0 not implement Animal interface! ") } pig:=Pig{18} var animal1 interface{} = pig if _, ok := animal1.(Animal); ok { fmt.Printf("animal1 implement Animal interface! ") }else { fmt.Printf("animal1 not implement Animal interface! ") } }