八、结构体和接口

package main

 

import (

    "fmt"

)

 

type Node struct {

    x,y int

}

 

// 结构体外接函数（能不能在结构体内写，目前还不清楚能不能在内部定义

func (node Node) area() (res int) {

    res = 0

    res = node.x * node.y

    return

}

 

func main() {

    var node = Node{1,2}

    fmt.Println(node.area())

}

package main

 

import (

    "fmt"

)

 

// 定义接口

type Phone interface {

    // 定义方法

    call()

}

 

type Iphone struct {

}

 

type Nokiaphone struct {

}

 

func (nokiaphone Nokiaphone) call() {

    fmt.Println("this is Nokiaphone")

}

 

func (iphone Iphone) call() {

    fmt.Println("this is Iphone")

}

 

func main() {

    var phone Phone

    phone = new(Iphone)

    phone.call()

 

    phone = new(Nokiaphone)

    phone.call()

}