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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327
9
章
Iterator
パターンと
Composite
パターン
Iterator
パターンとの出会い
この反復処理のカプセル化計画は、実際にうまくいきそうです。
そして、おそらくすでに察しがついていると思いますが、これは
Iterator
パターンと呼ばれるデザインパターンです。
Iterator
パターンについては、
Iterator
というインタフェースに依
存していることをまず知っておいてください。以下は考えられる
1
つの
Iterator
インタフェースです。
hasNext()
next()
<<interface>>
Iterator
hasNext()
メソッドは、
アグリゲート内に反復処
理を行う要素がさらにあ
るかどうか通知します。
next()
メソッドは、ア
グリゲート内の次のオブ
ジェクトを返します。
このインタフェースがあれば、あらゆる種類のオブジェクトコ
レクション用のイテレータを実装できます。配列、リスト、ハッ
シュテーブルなど、どんなオブジェクトコレクションも使えるの
です。
DinerMenu
で配列用のイテレータを実装したいとしたら、
こうなるでしょう。
DinerMenuIterator
は、
MenuItem
の配列に対する反
復処理方法を知っているイテ
レータの実装です。
hasNext()
next()
<<interface>>
Iterator
hasNext()
next()
DinerMenuIterator
次に、このイテレータを実装し、
DinerMenu
に組み込んでどのよ
うに動作するかを調べてみましょう。 ...
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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.