Go语言之接口定义

type interfaceName interface {    methodName(argType ReturnType) returnType    //...}

type smartDevice interface {    playMusic(song string) error    setAlarm(time string) error    makeCall(number string) error}

type smartPhone struct {    name string}
func (p smartPhone) playMusic(song string) error {    // implement playMusic    return nil}
func (p smartPhone) setAlarm(time string) error {    // implement setAlarm    return nil}
func (p smartPhone) makeCall(number string) error {    // implement makeCall    return nil}

if _, ok := x.(T); ok {    // x implements the interface T} else {    // x doesn't implement the interface T}

// 定义了一个Worker接口，有Work方法type Worker interface {    Work()}
// 定义了一个Eater接口，有Eat方法type Eater interface {    Eat()}
// 定义了一个Rest接口，有Rest方法type Rest interface {    Rest()}
// 定义了一个Human结构体，有Name属性，Work、Eat、Rest方法type Human struct {    Name string}
func (h Human) Work() {    fmt.Println(h.Name, "is working.")}
func (h Human) Eat() {    fmt.Println(h.Name, "is eating.")}
func (h Human) Rest() {    fmt.Println(h.Name, "is resting.")}
func mAIn() {    mike := Human{"Mike"}
    // 这个地方可以看到，Human结构体实现了Work、Eat和Rest三个接口    var w Worker = mike    var e Eater = mike    var r Rest = mike
    w.Work()    e.Eat()    r.Rest()}

func (h Human) Rest() {    fmt.Println(h.Name, "is resting.")}和func (h *Human) Rest() {    fmt.Println(h.Name, "is resting.")

func (h *Human) setName(name string) {    h.Name = name // 这将会改变原对象的Name属性}

func (h Human) setName(name string) {    h.Name = name // 这不会改变原对象的Name属性，只修改副本}