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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291
8
章
Template Method
パターン
Template Method
パターンの定義
Template Methodパターンは、メソッド内でアルゴリズ
ムの骨組みを定義し、一部の手順をサブクラスに委ねる。
Template Method
は、アルゴリズムの構造を変えることな
く、アルゴリズムのある手順をサブクラスに再定義させる。
Template Method
パターンが、
Tea
と
Coffee
クラスの例でどのように機能するかが理
解できたと思います。ここでは正式な定義を確認し、すべての詳細を明確にしましょう。
このパターンでは、アルゴリズムのためのテンプレートの作成がすべてです。テンプ
レートとは何でしょうか？
これまで説明したように、テンプレートは単なるメソッドで
す。もっと厳密に言えば、アルゴリズムを一連の手順として定義するメソッドです。そ
の中の
1
つ以上の手順を抽象メソッドとして定義し、サブクラスで実装します。これに
より、アルゴリズムの構造を変えずに、サブクラスが実装の一部を提供できるのです。
では、クラス図を見てみましょう。
templateMethod()
primitiveOperation1()
primitiveOperation2()
AbstractClass
primitiveOperation1()
primitiveOperation2()
ConcreteClass
primitiveOperation1();
primitiveOperation2(); ...
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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.
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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.