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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333
9
章
Iterator
パターンと
Composite
パターン
hasNext()
next()
<<interface>>
Iterator
すべてを整理する前に、現在の設計の鳥瞰図を見てみましょう。
イテレータは、アグリゲートの要素を段階的に処理
する方法を提供してくれます。ただしアグリゲート
の要素の走査をサポートするために、アグリゲート
が独自のインタフェースに多くのメソッドを追加す
る必要はありません。また、イテレータの実装をア
グリゲートの外に置くこともできます。つまり、反
復処理をカプセル化しているのです。
PancakeHouseMenu
と
DinerMenu
は、新
しい
createIterator()
メソッドを実装します。
このメソッドは、それぞれのメニュー項目実
装のイテレータを作成する役割を担います。
printMenu()
Waitress
createIterator()
PancakeHouseMenu
menu
Items
createIterator()
DinerMenu
menu
Items
hasNext()
next()
DinerMenuIterator
hasNext()
next()
PancakeHouseMenuIterator
現在の設計を見直す
2
つのメニューは全く同じ一連のメ
ソッドを実装していますが、同じ
インタフェースを実装しているわ
けではありません。これを修正し、
Waitress
が具象メニューに全く依存
しないようにします。
ここでは、共通
の
Iterator ...
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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.