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example2.go
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example2.go
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// All material is licensed under the Apache License Version 2.0, January 2004
// http://www.apache.org/licenses/LICENSE-2.0
// http://play.golang.org/p/cjZ-iIHIsK
// Sample program to show how polymorphic behavior with interfaces.
package main
import "fmt"
// notifier is an interface that defines notification
// type behavior.
type notifier interface {
notify()
}
// user defines a user in the program.
type user struct {
name string
email string
}
// notify implements the notifier interface with a pointer receiver.
func (u *user) notify() {
fmt.Printf("Sending user Email To %s<%s>\n",
u.name,
u.email)
}
// admin defines a admin in the program.
type admin struct {
name string
email string
}
// notify implements the notifier interface with a pointer receiver.
func (a *admin) notify() {
fmt.Printf("Sending admin Email To %s<%s>\n",
a.name,
a.email)
}
// main is the entry point for the application.
func main() {
// Create two values one of type user and one of type admin.
bill := user{"Bill", "bill@email.com"}
jill := admin{"Jill", "jill@email.com"}
// Pass a pointer of the values to support the interface.
sendNotification(&bill)
sendNotification(&jill)
}
// sendNotification accepts values that implement the notifier
// interface and sends notifications.
func sendNotification(n notifier) {
n.notify()
}