Go中interface嵌入和interface转换

import (
"fmt"
)

type Humaner interface {
SayHi()
}

type Personer interface {
Humaner
Sing(lyrics string) //lyrics 歌词
}

type Student struct {
name string
score float64
}

func (s *Student) SayHi() {
fmt.Printf("Student[%s, %f]say hi!\n", s.name, s.score)
}

func (s *Student) Sing(lyrics string) {
fmt.Printf("Student sing[%s]!!\n", lyrics)
}

func main() {
s := &Student{"ck_god", 88.88}

var i2 Personer
i2 = s //接口指向struct对象
i2.SayHi()
i2.Sing("god is a girl")

//var i3 Humaner = &Student{"ck_god", 88.88}
//var i4 Personer = i1 //err
//Personer为超集，Humaner为子集
var i5 Personer = &Student{"ck_god", 88.88}
var i6 Humaner = i5
i6.SayHi()

}