July 2024
Beginner to intermediate
272 pages
5h 40m
Japanese
Content preview from アーキテクトの教科書 価値を生むソフトウェアのアーキテクチャ構築
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059
2
⹅
図2.3.1
SOLID原則
略称 原則（英語表記） 原則（日本語表記）
SRP Single Responsibility Principle 単一責任の原則
OCP Open-Closed Principle オープン・クローズドの原則
LSP Liskov Substitution Principle リスコフの置換原則
ISP Interface Segregation Principle インターフェース分離の原則
DIP Dependency Inversion Principle 依存関係逆転の原則
SRP：単一責任の原則
クラスを変更する理由は 1 つ以上存在してはならない。
※7
SRPは、クラスにはただ一つの明確な役割（責任）を持たせるべきと
いう原則です。複数の役割を担うとクラスは肥大化し、コードの見通し
が悪くなります。また、そのクラスに依存する他のクラスの数も増え、
依存関係が複雑化する可能性もあります。オブジェクト指向設計におい
ては単一の役割を担う小さなクラスに分割することが基本となります
（図2.3.2）。
⹅
図2.3.2
単一責任の原則（SRP）に則ったクラス分割
クライアント
クラス
役割A
役割B
クライアント
クライアント
クライアント
クラスB
クラスA
役割A
役割B
とてもシンプルな原則ですが、悩ましいのは役割をどの粒度で捉えれ
ばよいかという点です。極端な話、それぞれのクラスが一つのインスタ
ンス変数と一つのメソッドだけで構成されるまで分割すればよいかとい
060
うと、そういうことでもありません。 ...
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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.