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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459
11
章
Proxy
パターン
アルバムジャケット仮想プロキシの設計
<<interface>>
Icon
getIconWidth()
getIconHeight()
paintIcon()
ImageProxy
subject
getIconWidth()
getIconHeight()
paintIcon()
getIconWidth()
getIconHeight()
paintIcon()
ImageIcon
画像を表示するクラス
javax.
swing.ImageIcon
これがプロキシです。プロキシはま
ずメッセージを表示し、画像を読み
込むと
ImageIcon
に委譲して画像を
表示します。
ユーザインタフェース
に画像を表示するため
の
Swing Icon
インタ
フェース
アルバムジャケットビューアのコードを書く前に、クラス図を確認しましょう。この
クラス図はリモートプロキシのクラス図と似ていますが、こちらはプロキシを使って、
実際にネットワーク上のどこかにあるオブジェクトではなく、（ネットワーク経由で
Icon
データを取得する必要があるため）作成にコストがかかるオブジェクトを隠しています。
ImageProxy
がまず
ImageIcon
を作成し、ネットワーク
URL
から
ImageIcon
の読み込みを開始する。
画像バイトの取得中には、
ImageProxy
は「アルバムジャケットを読み込
み中です。お待ちください」と表示する。
画像を完全に読み込んだら、
ImageProxy
はすべてのメソッド呼び出し ...
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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.