type Student struct {
    Human //匿名字段Human
    school string
    loan float32
}

type Employee struct {
    Human //匿名字段Human
    company string
    money float32
}

//Human對象實(shí)現(xiàn)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對象實(shí)現(xiàn)Sing方法
func (h *Human) Sing(lyrics string) {
    fmt.Println("La la, la la la, la la la la la...", lyrics)
}

//Human對象實(shí)現(xiàn)Guzzle方法
func (h *Human) Guzzle(beerStein string) {
    fmt.Println("Guzzle Guzzle Guzzle...", beerStein)
}

// Employee重載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) //此句可以分成多行
}

//Student實(shí)現(xiàn)BorrowMoney方法
func (s *Student) BorrowMoney(amount float32) {
    s.loan += amount // (again and again and...)
}

//Employee實(shí)現(xiàn)SpendSalary方法
func (e *Employee) SpendSalary(amount float32) {
    e.money -= amount // More vodka please!!! Get me through the day!
}

// 定義interface
type Men interface {
    SayHi()
    Sing(lyrics string)
    Guzzle(beerStein string)
}

type YoungChap interface {
    SayHi()
    Sing(song string)
    BorrowMoney(amount float32)
}

type ElderlyGent interface {
    SayHi()
    Sing(song string)
    SpendSalary(amount float32)
}

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實(shí)現(xiàn)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實(shí)現(xiàn)Sing方法
func (h Human) Sing(lyrics string) {
    fmt.Println("La la la la...", lyrics)
}

//Employee重載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)
    }

// Interface Men被Human,Student和Employee實(shí)現(xiàn)
// 因?yàn)檫@三個(gè)類型都實(shí)現(xiàn)了這兩個(gè)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{"Tom", 37, "222-444-XXX"}, "Things Ltd.", 5000}

    //定義Men類型的變量i
    var i Men

    //i能存儲Student
    i = mike
    fmt.Println("This is Mike, a Student:")
    i.SayHi()
    i.Sing("November rain")

    //i也能存儲Employee
    i = Tom
    fmt.Println("This is Tom, an Employee:")
    i.SayHi()
    i.Sing("Born to be wild")

    //定義了slice Men
    fmt.Println("Let's use a slice of Men and see what happens")
    x := make([]Men, 3)
    //這三個(gè)都是不同類型的元素，但是他們實(shí)現(xiàn)了interface同一個(gè)接口
    x[0], x[1], x[2] = paul, sam, mike

    for _, value := range x{
        value.SayHi()
    }
}

type Human struct {
    name string
    age int
    phone string
}

// 通過這個(gè)方法 Human 實(shí)現(xiàn)了 fmt.Stringer
func (h Human) String() string {
    return "❰"+h.name+" - "+strconv.Itoa(h.age)+" years -  ✆ " +h.phone+"❱"
}

func main() {
    Bob := Human{"Bob", 39, "000-7777-XXX"}
    fmt.Println("This Human is : ", Bob)
}

import (
    "fmt"
    "strconv"
)

type Element interface{}
type List [] Element

type Person struct {
    name string
    age int
}

//定義了String方法，實(shí)現(xiàn)了fmt.Stringer
func (p Person) String() string {
    return "(name: " + p.name + " - age: "+strconv.Itoa(p.age)+ " years)"
}

func main() {
    list := make(List, 3)
    list[0] = 1 // an int
    list[1] = "Hello" // a string
    list[2] = Person{"Dennis", 70}

    for index, element := range list {
        if value, ok := element.(int); ok {
            fmt.Printf("list[%d] is an int and its value is %d\n", index, value)
        } else if value, ok := element.(string); ok {
            fmt.Printf("list[%d] is a string and its value is %s\n", index, value)
        } else if value, ok := element.(Person); ok {
            fmt.Printf("list[%d] is a Person and its value is %s\n", index, value)
        } else {
            fmt.Println("list[%d] is of a different type", index)
        }
    }
}

import (
    "fmt"
    "strconv"
)

type Element interface{}
type List [] Element

type Person struct {
    name string
    age int
}

//打印
func (p Person) String() string {
    return "(name: " + p.name + " - age: "+strconv.Itoa(p.age)+ " years)"
}

func main() {
    list := make(List, 3)
    list[0] = 1 //an int
    list[1] = "Hello" //a string
    list[2] = Person{"Dennis", 70}

    for index, element := range list{
        switch value := element.(type) {
            case int:
                fmt.Printf("list[%d] is an int and its value is %d\n", index, value)
            case string:
                fmt.Printf("list[%d] is a string and its value is %s\n", index, value)
            case Person:
                fmt.Printf("list[%d] is a Person and its value is %s\n", index, value)
            default:
                fmt.Println("list[%d] is of a different type", index)
        }
    }
}