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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250
7
章
実世界のアダプタ
実世界のアダプタ
<<interface>>
Enumeration
hasMoreElements()
nextElement()
コレクション内にまだ要素がある
かどうかを返します。
コレクション内の次の要素を
返します。
<<interface>
Iterator
Enumeration
インタフェースの
hasMoreElements()
に似ていま
す。このメソッドは、コレクション
内のすべての項目を見終わったかど
うかを返すだけです。
コレクション内の次の要素
を返します。
コレクションから項目
を削除します。
列挙子
しばらくの間
Java
に関わってきていたのであ
れば、初期のコレクション型（
Vector
、
Stack
、
Hashtable
など）が
elements()
メソッドを実装し、
このメソッドが
Enumeration
型を返すことを覚
えているでしょう。
Enumeration
インタフェース
により、コレクション内での要素の管理方法の
詳細を知らなくても、コレクションの要素を扱
うことができます。
イテレータ
最近のコレクションクラスは、
Enumeration
イ
ンタフェースに似た、コレクション内の一連の
項目を反復処理できる
Iterator
インタフェースを
使って、項目を削除する機能を追加しました。
イテレータが必要なコードで列挙子を使う
Enumeration
インタフェースを公開しているレガシーコードに遭遇することも
ありますが、新しいコードでは
Iterator
だけを使いたいものです。アダプタを構
築する必要がありそうです。 ...
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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.