polymorphism.go

package main

import "fmt"

type Birds interface { // Distill common methods
    fly()
}

type Dove struct {
}

type Eagle struct {
}

func (d *Dove) fly() { // Encapsulation method
    fmt.Println("Pigeons are flying")
}

func (e *Eagle) fly() { // Encapsulation method
    fmt.Println("Eagle is flying")
}

func main() {
    var b Birds // Polymorphic abstract interface

    dove := Dove{}
    eagle := Eagle{}

    b = &dove
    b.fly() // Pigeons are flying

    b = &eagle
    b.fly() // Eagle is flying
}