package main

import "fmt"

// 接口定义设计规范
type SayHello interface {
	SayHello()
}
type American struct {
	Name string
}

func (person American) SayHello() {
	fmt.Println("你好")
}

type chinese struct {
	Name string
}

func (person chinese) SayHello() {
	fmt.Println("chinese")
}
func (person chinese) tiaowu() {
	fmt.Println("跳舞")
}

// 定义函数：接收接口的实例
func greet(s SayHello) {
	s.SayHello()

	//断言控制语句的要求 判断这是chinese
	ch, flag := s.(chinese)
	if flag == true {

		ch.tiaowu()
	} else {
		fmt.Println("no")
	}
}

func main() {
	var a [3]SayHello
	a[0] = chinese{"1"}
	a[1] = American{"hel"}
	a[0].SayHello()

	c := chinese{}
	c.tiaowu()
	c.SayHello()

}