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.
you are here
339
9
章
Iterator
パターンと
Composite
パターン
hasNext()
next()
remove()
<<interface>>
Iterator
hasNext()
next()
remove()
ConcreteIterator
createItera
tor()
<<interface>>
Aggregate
createIterator()
ConcreteAggregate
Client
ConcreteAggregate
は
オブジェクトのコレクショ
ンを持ち、そのコレクショ
ン用のイテレータを返すメ
ソッドを実装します。
ConcreteAggregate
は、オブジェクトのコ
レクションに対して反
復処理を実行できる
ConcreteIterator
をイン
スタンス化する責務があ
ります。
Iterator
インタフェース
には、すべてのイテレー
タが実装する必要のあ
るインタフェースと、コ
レクションの要素を走査
するための一連のメソッ
ドがあります。ここで
は
java.util.Iterator
を
使っています。
Java
の
Iterator
インタフェース
を使いたくない場合は、
いつでも独自のイテレー
タを作成できます。
アグリゲート用の共通インタフェースがあると、
クライアントにとっては便利です。このインタ
フェースにより、クライアントをオブジェクトコ
レクションの実装から分離します。
ConcreteIterator
は、反
復処理の現在位置を管理す
る責務があります。
すべての要素が入ったクラス図を確認しましょう。 ...
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.