En Go no existen las clases pero si existe la programación orientada a objetos, veamos un ejemplo
package main
import (
"fmt"
"bufio"
"os"
"strings"
)
type Animal interface {
Eat()
Move()
Speak()
GetName() string
}
type Cow struct { name string }
func (c Cow) Eat() {
fmt.Println("grass")
}
func (c Cow) Move() {
fmt.Println("walk")
}
func (c Cow) Speak() {
fmt.Println("moo")
}
func (c Cow) GetName() string {
return c.name
}
type Bird struct { name string }
func (c Bird) Eat() {
fmt.Println("worms")
}
func (c Bird) Move() {
fmt.Println("fly")
}
func (c Bird) Speak() {
fmt.Println("peep")
}
func (c Bird) GetName() string {
return c.name
}
type Snake struct { name string }
func (c Snake) Eat() {
fmt.Println("mice")
}
func (c Snake) Move() {
fmt.Println("slither")
}
func (c Snake) Speak() {
fmt.Println("hsss")
}
func (c Snake) GetName() string {
return c.name
}
func main() {
animals := make([]Animal, 0, 0)
var animal *Animal
for {
fmt.Print("< ")
inputStr := get_input()
input := strings.Split(inputStr, " ")
if (len(input) == 1 && input[0] == "quit") {
break
}
if len(input) == 3 && input[0] == "newanimal" {
aniStr := input[2]
switch aniStr {
case "cow":
animals = append(animals,Cow{ input[1] })
fmt.Println(" Created it! ")
case "bird":
animals = append(animals,Bird{ input[1] })
fmt.Println(" Created it! ")
case "snake":
animals = append(animals,Snake{ input[1] })
fmt.Println(" Created it! ")
default:
fmt.Println("incorrect input animal")
}
}
if len(input) == 3 && input[0] == "query" {
animal = find(animals, input[1])
if animal == nil {
fmt.Println("incorrect animal name")
} else {
actionStr := input[2]
switch actionStr {
case "eat":
(*animal).Eat()
case "move":
(*animal).Move()
case "speak":
(*animal).Speak()
default:
fmt.Println("incorrect input action")
break
}
}
}
}
}
func find(animals []Animal, name string) *Animal {
for i := 0; i < len(animals); i++ {
if animals[i].GetName() == name {
return &animals[i]
}
}
return nil
}
func get_input() string {
var input_string string
var input []byte
var err error
for {
reader := bufio.NewReader(os.Stdin)
input, _ , err = reader.ReadLine()
if err != nil{
fmt.Println("Something going wrong! Try again")
} else {
input_string = string(input)
break
}
}
return input_string
}
