June 2022
Beginner to intermediate
672 pages
17h 23m
Japanese
Content preview from Head Firstデザインパターン 第2版 ―頭とからだで覚えるデザインパターンの基本
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飲み物を装飾する
Decoratorパターンを使ってスターバズの飲み物を手直ししましょう。
Beverage beverage
CondimentDeco
rator
getDescription()
cost()
//
他の便利なメソッド
Beverage
description
cost()
getDescription()
Milk
cost()
HouseBlend
コンポーネント
cost()
DarkRoast
cost()
Decaf
cost()
Espresso
Mocha
コーヒーの種類を表す
4
つの具象コンポーネント
コンディメントデコレータ。これらは
cost()
だけでなく
getDescription()
も実装する必要があります。その理
由はすぐに説明します。
Beverage
は抽象コンポーネ
ントクラスの役割を務めます。
getDescription()
Soy Whip
cost()
getDescription()
cost()
getDescription()
cost()
getDescription()
デコレータがラップする
Beverage
への参照
先に進む前に、コーヒーとコンディメントの
cost()
メソッドの実装方法を考えてみましょう。
また、コンディメントの
getDescription()
メソッドの実装方法も考えてみましょう。
92
3
章
飲み物を装飾する
オフィスでの会話
継承とコンポジションに関する混乱
メアリー
スー：それはどういう意味？
メアリー：クラス図を見てよ。
CondimentDecorator
は
Beverage ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.