結構體Dog實現了接口的所有方法Animal，為什么*Dos不能賦值給*Animal？type Animal interface { run()}type Dog struct { name string}func (d *Dog) run() { fmt.Println( d.name , " is running")}func main(){ var d *Dog var a *Animal d = new(Dog) d.run() a = d //errors here}Go 通知以下錯誤：Cannot use 'd' (type *Dog) as type *Animal in assignment
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TA貢獻1828條經驗 獲得超6個贊
您必須從界面中刪除指針。
//Animal interface
type Animal interface {
run()
}
//Dog struct
type Dog struct {
name string
}
func (d *Dog) run() {
fmt.Println(d.name, "is running")
}
func main() {
var d *Dog
var a Animal
d = new(Dog)
d.name = "Putty"
d.run()
a = d //errors here
a.run()
}
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