编辑代码

package main

import (
    "fmt"
    "strconv"
)

type Animaler interface {
    eat()
}

type Animal struct {
    name string
    age int
    food string
}

func (animal Animal) eat() {
    fmt.Println(animal.name + "今年"+ strconv.Itoa(animal.age) +"岁了，" + "喜欢吃" + animal.food)
}

type Cat struct {
    Animal
    time int
}

type Dog struct {
    Animal
    plays string
}

// 猫独有的方法
func (cat Cat) sleep() {
    fmt.Println("我叫" + cat.name + "， 我能睡" + strconv.Itoa(cat.time) + "分钟" )
}
// 狗独有的方法
func (dog Dog) play() {
    fmt.Println("我叫" + dog.name + "我喜欢玩" + dog.plays)
}

func testInterface(animaler Animaler)  {
    animaler.eat()
}

func main()  {
    cat := Cat{Animal:Animal{name:"咪咪", age:2, food:"鱼"}, time: 8}
    cat.sleep()
    testInterface(cat)

    dog := Dog{Animal:Animal{name:"大黄", age:2, food:"骨头"}, plays:"球球"}
    dog.play()
    testInterface(dog)
}