go-interface-example.go

package main

import "fmt"

type Printer interface {
	Print()
	GetInformation() string
}

// ------------------------------------------------------------------

type SamsungPrinter struct {
	Name      string
	IPAddress string
}

func (p *SamsungPrinter) Print() {
	fmt.Println("Printer is printing...")
}

func (p *SamsungPrinter) GetInformation() string {
	return fmt.Sprintf("Name: %s, IP Address: %s", p.Name, p.IPAddress)
}

func NewSamsungPrinter(name string, ipAddress string) Printer {
	return &SamsungPrinter{Name: name, IPAddress: ipAddress}
}

// ------------------------------------------------------------------

type EpsonPrinter struct {
	Name      string
	IPAddress string
}

func (p *EpsonPrinter) Print() {
	fmt.Println("Epson Printer is printing...")
}

func (p *EpsonPrinter) GetInformation() string {
	return fmt.Sprintf("Name: %s, IP Address: %s", p.Name, p.IPAddress)
}

func NewEpsonPrinter(name string, ipAddress string) Printer {
	return &EpsonPrinter{Name: name, IPAddress: ipAddress}
}

// ------------------------------------------------------------------

func PrinterInfo(p Printer) {
	fmt.Println(p.GetInformation())
}

func PrintersInfo(printers []Printer) {
	for _, printer := range printers {
		PrinterInfo(printer)
	}
}

func main() {
	var printer1 = NewSamsungPrinter("Samsung", "244.178.44.111")
	printer1.Print()

	var printer2 = NewEpsonPrinter("Epson", "244.178.44.111")
	printer2.Print()

	var printers = []Printer{printer1, printer2}
	PrintersInfo(printers)
}