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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290
8
章
テンプレートメソッドで何が得られた？
力不足の
Tea
と
Coffee
の実装
テンプレートメソッドで何が得られた？
Coffee
と
Tea
が主導権を握っている。こ
の
2
つがアルゴリズムを制御する。
Coffee
と
Tea
でコードが重複している。
アルゴリズムのコードを変更するには、
サブクラスを開いて何度も変更する必要
がある。
新しいカフェイン飲料を追加するのに多
くの作業が必要となる構造で、クラスが
構築されている。
アルゴリズムの知識とその実装方法が、
多くのクラスに分散している。
CaffeineBeverage
クラスが主導権を
握っている。このクラスがアルゴリズム
を保持し、保護する。
CaffeineBeverage
クラスは、サブクラ
ス間の再利用を最大限する。
アルゴリズムは
1
か所だけにあり、コー
ド変更はそこに対して行うだけで済む。
Template Method
パターンには、他の
カフェイン飲料を追加できるフレームワー
クがある。新しいカフェイン飲料では、メ
ソッドをいくつか実装するだけでよい。
CaffeineBeverage
クラスはアルゴリ
ズムに関する知識に集中し、完全な実装
の用意をサブクラスに任せる。
テンプレートメソッドの威力を利用
した最先端の
CaffeineBeverage
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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.