ad.go

package main

import "fmt"

type LegacyPrinter struct {
}

func (l *LegacyPrinter) Print(s string) {
    fmt.Println(s)
}

type Printer interface {
    PrintStored() string
}

type PrinterAdapter struct {
    LegacyPrinter
}

func (p *PrinterAdapter) PrintStored() string {
    return "Adapted"
}

func main() {
    adapter := &PrinterAdapter{}
    fmt.Println(adapter.PrintStored())
    adapter.Print("Hello World!")
}