package main
import (
"fmt"
)
type hello_inter interface {
hello()
}
type animal interface {
printInfo()
}
type cat string
type dog string
type bird string
type edog string
type user struct {
name string
email string
}
type admin struct {
user
level string
}
func (u user) hello() {
fmt.Println("hello")
}
func (u user) printHello() {
fmt.Println("this is user")
}
func (a admin) printHello() {
fmt.Println("this is admin")
}
func (b bird) printInfo() {
// 值接收者实现animal接口
// 方法
fmt.Println("this is bird")
}
func (c cat) printInfo() {
//值接收者实现animal接口
// 方法
fmt.Println("this is cat")
}
func (d dog) printInfo() {
//值接收者实现animal接口
// 方法
fmt.Println("this is dog")
}
func (e *edog) printInfo() {
// 指针接收者实现animal接口
// 调用的地方需要以指针作为参数传递
fmt.Println("this is e-dog")
}
func invoke(a animal) {
// 函数
a.printInfo()
}
func sayHello (a admin) {
a.hello()
}
func main() {
/*--------------多态-------------*/
var a animal
var b bird
var c cat
var d dog
var e edog
invoke(&e) // this is e-dog
a = c
a.printInfo() // this is cat
a = d
a.printInfo() // this is dog
invoke(b) // this is bird
ad := admin{user{"serrini", "123@qq.com"}, "level001"}
ad.printHello() // 同名函数重写，打印admin // this is admin
//ad.hello()
sayHello(ad) // 内部user实现了接口hello_inter，外部类型admine也被认为实现了该接口 // hello
}
