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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282
8
章
抽象化の第一弾
Coffee
と
Tea
を抽象化しよう
各サブクラスは
独自のレシピを
実装します。
Coffee
クラスと
Tea
クラスは、とてもわかりやすい設計の
練習になりそうです。第一弾は以下のようになるでしょう。
prepareRecipe()
boilWater()
pourInCup()
CaffeineBeverage
prepareRecipe()
steepTeaBag()
addLemon()
Tea
prepareRecipe()
brewCoffeeGrinds()
addSugarAndMilk()
Coffee
boilWater()
メソッドと
pourInCup()
メソッドは両方のサブクラスで共有される
ので、スーパークラスで定義します。
prepareRecipe()
メソッドは
サブクラスごとに異なるので、
抽象メソッドとして定義します。
Coffee
と
Tea
で異なるメ
ソッドは、サブクラス内に
残ります。
各サブクラスは
prepareRecipe()
メ
ソッドをオーバーライ
ドして、独自のレシピ
を実装します。
うまく再設計できましたか？
うんうん、もう一度見直してみましょう。他の共通
点を見落としていませんか？
Coffee
と
Tea
には、他にどのような類似点があるで
しょうか？
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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.