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
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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.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.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.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.
this is a new chapter
169
次の目的地は
Singleton
パターンです。
Singleton
パターンは、インスタンスが
1
つしか存在しない唯
一無二のオブジェクトを作成するための手段です。すべてのパターンの中で、
Singleton
パターンはク
ラス図が最もシンプルなパターンだと知って、喜ぶかもしれません。実際、このクラス図にはクラスが
1
つしかありません！
しかし、安心してはいけません。クラス設計の観点ではシンプルですが、実装には
深いオブジェクト指向的な考え方が必要です。では、じっくりと考えながら進んでいきましょう。
これは他ではちょっと見られない
ものだよ。この形、カーブ、ボディ
を見てごらん！
私に言っているの？
それとも車に
言っているの？
ところで、私のオーブン
ミトンいつ返してくれるの？
5
章
Singleton
パターン
唯一のオブジェクト
170
5
章
唯一無二
開発者：それがどんな役に立つのでしょう？
師匠：オブジェクトが
1
つしか必要ないというケースは、数多くある。スレッドプール、キャッシュ、ダイアロ
グボックス、プリファレンスやレジストリの設定を処理するオブジェクト、ログ記録用オブジェクト、プリンタ
やグラフィックカードなどのデバイスドライバとして働くオブジェクトなどが、それにあたる。実際、これらの ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.