go语言之进阶篇接口转换

1、go语音之进阶篇

示例:

package main

import "fmt"

type Humaner interface { //子集
	sayhi()
}

type Personer interface { //超集
	Humaner //匿名字段,继承了sayhi()
	sing(lrc string)
}

type Student struct {
	name string
	id   int
}

//Student实现了sayhi()
func (tmp *Student) sayhi() {
	fmt.Printf("Student[%s, %d] sayhi\n", tmp.name, tmp.id)
}

func (tmp *Student) sing(lrc string) {
	fmt.Println("Student在唱着:", lrc)
}

func main() {
	//超集可以转换为子集,反过来不可以
	var iPro Personer //超集
	iPro = &Student{"mike", 666}

	var i Humaner //子集

	//iPro = i //err
	i = iPro //可以,超集可以转换为子集
	i.sayhi()

}

执行结果:

Student[mike, 666] sayhi

  

posted @ 2019-01-11 10:36  努力哥  阅读(1491)  评论(0编辑  收藏  举报