Update 4、interface.md

Author: aceld

4、interface.md

@@ -19,9 +19,9 @@ type People interface {
 	Speak(string) string
 }
 
-type Stduent struct{}
+type Student struct{}
 
-func (stu *Stduent) Speak(think string) (talk string) {
+func (stu *Student) Speak(think string) (talk string) {
 	if think == "love" {
 		talk = "You are a good boy"
 	} else {
@@ -31,7 +31,7 @@ func (stu *Stduent) Speak(think string) (talk string) {
 }
 
 func main() {
-	var peo People = Stduent{}
+	var peo People = Student{}
 	think := "love"
 	fmt.Println(peo.Speak(think))
 }
@@ -51,7 +51,7 @@ func main() {
 
 那么，满足上述3个条件，就可以产生多态效果，就是，父类指针可以调用子类的具体方法。
 
-所以上述代码报错的地方在`var peo People = Stduent{}`这条语句， `Student{}`已经重写了父类`People{}`中的`Speak(string) string`方法，那么只需要用父类指针指向子类对象即可。
+所以上述代码报错的地方在`var peo People = Student{}`这条语句， `Student{}`已经重写了父类`People{}`中的`Speak(string) string`方法，那么只需要用父类指针指向子类对象即可。
 
 所以应该改成`var peo People = &Student{}` 即可编译通过。（People为interface类型，就是指针类型）