指针类型和值类型的方法

题目:

下面这段代码输出什么？为什么？

type People interface {
	Speak(string) string
}

type Student struct{}

func (stu *Student) Speak(think string) (talk string) {
	if think == "speak" {
		talk = "speak"
	} else {
		talk = "hi"
	}
	return
}

func main() {
	var peo People = Student{}
	think := "speak"
	fmt.Println(peo.Speak(think))
}

• A. speak
• B. compilation error

答案解析：

参考答案及解析：B。

编译错误 Student does not implement People (Speak method has pointer receiver)，值类型 Student 没有实现接口的 Speak() 方法，而是指针类型 *Student 实现改方法。

详细请参考这篇文章 https://seekload.net/2019/06/06/go-study-method.html