/* 定义接口 */
type interface_name interface {
   method_name1 [return_type]
   method_name2 [return_type]
   method_name3 [return_type]
   ...
   method_namen [return_type]
}

/* 定义结构体 */
type struct_name struct {
   /* variables */
}

/* 实现接口方法 */
func (struct_name_variable struct_name) method_name1() [return_type] {
   /* 方法实现 */
}
...
func (struct_name_variable struct_name) method_namen() [return_type] {
   /* 方法实现*/
}

package main

import (
    "fmt"
)

type Phone interface {
    call()
}

type NokiaPhone struct {
}

func (nokiaPhone NokiaPhone) call() {
    fmt.Println("I am Nokia, I can call you!")
}

type IPhone struct {
}

func (iPhone IPhone) call() {
    fmt.Println("I am iPhone, I can call you!")
}

func main() {
    var phone Phone

    phone = new(NokiaPhone)
    phone.call()

    phone = new(IPhone)
    phone.call()

}

I am Nokia, I can call you!
I am iPhone, I can call you!

package main

import "fmt"

type Human struct {
	name  string
	age   int
	phone string
}
type Student struct {
	Human  //匿名字段
	school string
	loan   float32
}
type Employee struct {
	Human   //匿名字段
	company string
	money   float32
} //Human实现Sayhi方法
func (h Human) SayHi() {
	fmt.Printf("Hi, I am %s you can call me on %s\n", h.name, h.phone)
} //Human实现Sing方法
func (h Human) Sing(lyrics string) {
	fmt.Println("La la la la...", lyrics)
} //Employee重写Human的SayHi方法
func (e Employee) SayHi() {
	fmt.Printf("Hi, I am %s, I work at %s. Call me on %s\n", e.name,
		e.company, e.phone) //Yes you can split into 2 lines here.
}

// Interface Men被Human,Student和Employee实现
// 因为这三个类型都实现了这两个方法
type Men interface {
	SayHi()
	Sing(lyrics string)
}

func main() {
	mike := Student{Human{"Mike", 25, "222-222-XXX"}, "MIT", 0.00}
	paul := Student{Human{"Paul", 26, "111-222-XXX"}, "Harvard", 100}
	sam := Employee{Human{"Sam", 36, "444-222-XXX"}, "Golang Inc.", 1000}
	Tom := Employee{Human{"Sam", 36, "444-222-XXX"}, "Things Ltd.", 5000}
	//定义Men类型的变量i
	var i Men
	//i能存储Student
	i = mike
	fmt.Println("This is Mike, a Student:")
	i.SayHi()
	i.Sing("November rain")
	//i也能存储Employee
	i = Tom
	fmt.Println("This is Tom, an Employee:")
	i.SayHi()
	i.Sing("Born to be wild")
	//定义了slice Men
	fmt.Println("Let's use a slice of Men and see what happens")
	x := make([]Men, 3)
	//T这三个都是不同类型的元素，但是他们实现了interface同一个接口
	x[0], x[1], x[2] = paul, sam, mike
	for _, value := range x {
		value.SayHi()
	}
}

This is Mike, a Student:
Hi, I am Mike you can call me on 222-222-XXX
La la la la... November rain
This is Tom, an Employee:
Hi, I am Sam, I work at Things Ltd.. Call me on 444-222-XXX
La la la la... Born to be wild
Let's use a slice of Men and see what happens
Hi, I am Paul you can call me on 111-222-XXX
Hi, I am Sam, I work at Golang Inc.. Call me on 444-222-XXX
Hi, I am Mike you can call me on 222-222-XXX

package main

import "fmt"

type Human interface {
	Len()
}
type Student interface {
	Human
}

type Test struct {
}

func (h *Test) Len() {
	fmt.Println("成功")
}
func main() {
	var s Student
	s = new(Test)
	s.Len()
}

package test

import (
	"fmt"
)

type Controller struct {
	M int32
}

type Something interface {
	Get()
	Post()
}

func (c *Controller) Get() {
	fmt.Print("GET")
}

func (c *Controller) Post() {
	fmt.Print("POST")
}

package main

import (
	"fmt"
	"test"
)

type T struct {
	test.Controller
}

func (t *T) Get() {
	//new(test.Controller).Get()
	fmt.Print("T")
}
func (t *T) Post() {
	fmt.Print("T")
}
func main() {
	var something test.Something
	something = new(T)
	var t T
	t.M = 1
	//	t.Controller.M = 1
	something.Get()
}

// 安全类型断言

<目标类型的值>，<布尔参数> := <表达式>.( 目标类型 )

//非安全类型断言

<目标类型的值> := <表达式>.( 目标类型 )

package main

import "fmt"

func main() {

   var i1 interface{} = new (Student)
   s := i1.(Student) //不安全，如果断言失败，会直接panic

   fmt.Println(s)


	var i2 interface{} = new(Student)
	s, ok := i2.(Student) //安全，断言失败，也不会panic，只是ok的值为false
	if ok {
		fmt.Println(s)
	}
}

type Student struct {

}

switch ins:=s.(type) {
	case Triangle:
		fmt.Println("三角形。。。",ins.a,ins.b,ins.c)
	case Circle:
		fmt.Println("圆形。。。。",ins.radius)
	case int:
		fmt.Println("整型数据。。")
	}