gointerface

main.go

package main

import "fmt"

type Person interface {
	Greet() string
	SetGreet(string)
	SetName(string)
	GetName() string
}

// Man
type Man struct {
	name  string
	greet string
}

func (p *Man) Greet() string {
	if p.greet == "" {
		return "おっす"
	}
	return p.greet
}
func (p *Man) SetGreet(greet string) {
	p.greet = greet
}
func (p *Man) SetName(name string) {
	p.name = name
}
func (p *Man) GetName() string {
	return p.name
}

// Woman
type Woman struct {
	name  string
	greet string
}

func (p *Woman) Greet() string {
	if p.greet == "" {
		return "こんばんは"
	}
	return p.greet
}
func (p *Woman) SetGreet(greet string) {
	p.greet = greet
}
func (p *Woman) SetName(name string) {
	p.name = name
}
func (p *Woman) GetName() string {
	return p.name
}

// NewType
type WeiType struct {
	Man
}

func (p *WeiType) Greet() string {
	return "うぇーいｗｗｗｗｗｗ"
}

func main() {
	var person Person = &WeiType{
		Man{},
	}
	fmt.Println(person.Greet())
}