How to write interface in go language

The interface definition method in go language: [type interface_name interface {method_name1 [return_type]}]. An interface defines all common methods. Any other type that implements these methods will implement this interface.

The operating environment of this article: windows10 system, Go 1.11.2, thinkpad t480 computer.

The Go language provides another data type, the interface, which defines all common methods together. Any other type that implements these methods will implement this interface.

Example:

/* 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*/
}

Example:

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()

}

In the above example, we defined an interface Phone, which has a method call(). Then we defined a Phone type variable in the main function and assigned it to NokiaPhone and IPhone respectively. Then call the call() method, the output result is as follows:

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

Related recommendations: golang tutorial

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