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                Go 語言提供了另外一種數據類型即接口,它把所有的具有共性的方法定義在一起,任何其他類型只要實現了這些方法就是實現了這個接口。 > interface是方法的集合 > interface是一種類型 ~~~ /* 定義接口 */ type interface_name interface { method_name1 [return_type] method_name2 [return_type] method_name3 [return_type] ... method_namen [return_type] } /* 定義結構體 */ type struct_name struct { /* variables */ } /* 實現接口方法 */ func (struct_name_variable struct_name) method_name1() [return_type] { /* 方法實現 */ } ~~~ ## 一、示例 ~~~ package main import ( "fmt" ) type Phone interface { call() } type IPhone struct { } func (iPhone IPhone) call() { fmt.Println("I am iPhone, I can call you!") } func main() { var phone Phone phone = new(IPhone) phone.call() } ~~~ 結果: ~~~ I am iPhone, I can call you! ~~~ ## 二、接口數組和形參 ~~~ package main import "fmt" type Animal interface { Speak() string } type Cat struct{} func (c Cat) Speak() string { return "cat" } type Dog struct{} func (d Dog) Speak() string { return "dog" } func Test(params interface{}) { fmt.Println(params) } func main() { animals := []Animal{Cat{}, Dog{}} for _, animal := range animals { fmt.Println(animal.Speak()) } Test("string") Test(123) Test(true) } ~~~ 結果: ~~~ cat dog string 123 true ~~~
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