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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you are here
283
8
章
Template Method
パターン
(1)
お湯を沸かす。
(2)
沸騰したお湯でコーヒーを淹れる。
(3)
カップにコーヒーを注ぐ。
(4)
砂糖とミルクを加える。
スターバズコーヒーのレシピ
スターバズ紅茶のレシピ
(1)
お湯を沸かす。
(2)
沸騰したお湯に紅茶を浸す。
(3)
カップに紅茶を注ぐ。
(4)
レモンを加える。
さらに設計を進める
それでは、他に
Coffee
と
Tea
が共通して行うことは何でしょうか？
まずはレシピから始めま
しょう。
どちらのレシピも同じアルゴリズムに従っていますね。
1
お湯を沸かす。
2
3
4
お湯を使ってコーヒーか紅茶を抽出する。
抽出した飲み物をカップに注ぐ。
飲み物に適当なコンディメントを追加する。
❶と❸は、すでに基
底クラス内に抽象化
されています。
これらは抽象化され
ていませんが同じも
のです。別の飲み物
に適用しているだけ
です。
それでは、
prepareRecipe()
を抽象化する方法もあるのでしょうか？
あるのです。探してみましょう。
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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.