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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536
12
章
DJ
コントローラ
public interface ControllerInterface {
void start();
void stop();
void increaseBPM();
void decreaseBPM();
void setBPM(int bpm);
}
次はコントローラ
ここでは、欠けている部分、すなわちコントローラを書いていきます。コ
ントローラは、ビューに賢さを与えるストラテジーでしたね。
Strategy
パターンを実装しているので、まず
DJ
ビューに組み込む
ストラテジー用のインタフェースが必要です。このインタフェースを
ControllerInterface
と呼ぶことにします。
ビューがコントローラで
呼び出すことができるメ
ソッドです。
モデルのインタフェースを確認した後なので、これ
らのメソッドには見覚えがあるはずです。ビート生
成の停止と開始や、
BPM
の変更を行えます。この
インタフェースでは
BPM
を増減して調節できるた
め、
BeatModel
インタフェースよりも「機能が豊
富」です。
ビューとコントローラが一緒に
Strategy
パターンを利用していることを説明しまし
た。このパターンを表す
2
つのクラスのクラス図を描いてください。
デ ザ イン パ ズ ル
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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.