Go语言基础go接口用法示例详解_Golang_

 type [接口名] interface { 方法名1(参数列表) 返回值列表 方法名2(参数列表) 返回值列表 ... } 

 type Isay interface{ sayHi() } 

 //定义接口的实现类 type Chinese struct{} //实现接口 func (_ *Chinese) sayHi() { fmt.Println("中国人说嗨") } 

 //中国人 type Chinese struct{} //美国人 type Americans struct{} func (this *Chinese) sayHi() { fmt.Println("中国人说嗨") } func (this Americans) sayHi() { fmt.Println("美国人说hi") } //调用 &Chinese{}.sayHi() Americans{}.sayHi() 

 interface{} 

 var v1 interface{} = 1 var v2 interface{} = "abc" var v3 interface{} = struct{ X int }{1} 

 func Fprint(w io.Writer, a ...interface{}) (n int, err error) func Fprintf(w io.Writer, format string, a ...interface{}) func Fprintln(w io.Writer, a ...interface{}) func Print(a ...interface{}) (n int, err error) func Printf(format string, a ...interface{}) func Println(a ...interface{}) (n int, err error) 

 //说话 type Isay interface{ sayHi() } //工作 type Iwork interface{ work() } //定义一个接口，组合了上述两个接口 type IPersion interface{ Isay Iwork } type Chinese struct{} func (_ Chinese) sayHi() { fmt.Println("中国人说中国话") } func (_ Chinese) work() { fmt.Println("中国人在田里工作") } //上述接口等价于： type IPersion2 interface { sayHi() work() } 

 package main import "fmt" //中国话 type Isay interface { sayHi() } //工作 type Iwork interface { work() } //中国人 type Chinese struct{} //美国人 type Americans struct{} func (this *Chinese) sayHi() { fmt.Println("中国人说嗨") } func (this Americans) sayHi() { fmt.Println("美国人说hi") } type IPersion interface { Isay Iwork } func (_ Chinese) work() { fmt.Println("中国人在田里工作") } func main() { var chinese Isay = &Chinese{} chinese.sayHi() Americans{}.sayHi() //接口组合 var ipersion IPersion = &Chinese{} ipersion.sayHi() ipersion.work() }