了解Golang中的接口

Question

I'm trying to understand interfaces in Go. I wrote this:

package main

import "fmt"

type Animal struct {
    Name    string
    Ability string
}

type AbilityShower interface {
    ShowAbility() string
}

func (a Animal) ShowAbility() string {
    return fmt.Sprintf("%s can %s", a.Name, a.Ability)
}

func main() {
    var Dog Animal = Animal{
        Name:    "Dog",
        Ability: "Walk",
    }

    Dog.ShowAbility()
}

But when I run with go run main.go nothing appears in the console. What am I doing incorrectly?

Answer 1

You are not printing the result. Change the main to

func main() {
    var Dog Animal = Animal{
        Name:    "Dog",
        Ability: "Walk",
    }

    fmt.Println(Dog.ShowAbility())
}

FYI: fmt.Sprintf() returns a string and doesn't print it to standard output

// Sprintf formats according to a format specifier and returns the resulting string.