[GO]接口的定義和實現

package main

import "fmt"

type Humaner interface {
    SayHi()
}

type Student struct {
    name string
    id int
}

func (tmp *Student) SayHi()  {
    fmt.Printf("Student%s %d sayhi\n", tmp.name, tmp.id)
}

type Teacher struct {
    group string
    addr string
}

func (tmp *Teacher) SayHi()  {
    fmt.Printf("Teacher%s %s sayhi\n", tmp.group, tmp.addr)
}

type MyStr string

func (tmp *MyStr) SayHi()  {
    fmt.Printf("MyStr %s sayhi", *tmp)
}

func main() {
    //定義接口類型的變量
    var i Humaner
    //只是實現了此接口方法的類型，那么這個類型的變量（接收者類型）就可以給i賦值
    s := &Student{"mike", 1}
    i = s
    i.SayHi()
    t := &Teacher{"mike", "NJ"}
    i = t
    i.SayHi()
    var str MyStr = "hello mike"
    i = &str
    i.SayHi()
}

執行結果 

Studentmike 1 sayhi
Teachermike NJ sayhi
MyStr hello mike sayhi