4.7 go接口定义

package main

import "fmt"

/**
type Hummaner interface{

	SayHi()
}
1接口习惯以er结尾
2接口中只有方法声明，没有实现，没有数据字段
3接口可以嵌入其他接口，或嵌入其他结构中

 多态的体现

**/
type Humaner interface {
	//只声明，有别的类型实现
	SayHi()
}

type Student struct {
	name string
	age  int
}

func (s *Student) SayHi() {
	fmt.Println("此学生叫", s.name)

}

type Teacher struct {
	name string
	age  int
}

func (s *Teacher) SayHi() {
	fmt.Println("此老师叫", s.name)

}
func HumanerSayHi(h Humaner) {
	h.SayHi()

}
func main() {
	//定义接口变量
	var i Humaner
	s := Student{"小王", 22}
	i = &s
	//只是实现了此接口的方法，就可以将这个类型的变量（接受者类型）赋值给i
	i.SayHi()
	t := Teacher{"老王", 44}

	i = &t
	i.SayHi()
	//多态的体现
	HumanerSayHi(&s)
	HumanerSayHi(&t)
	x := make([]Humaner, 2)
	x[0] = &s
	x[1] = &t
	for _, i := range x {
		i.SayHi()
	}

}