Go中interface嵌入和interface转换

// code_22_interface_field_interface project main.go

package main

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()

}

//总结：通过赋值或者参数传递的形式,完成接口的调用。

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