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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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.
474
11
章
修正すべき問題は
2
つあります。会員は自分のギーク度を変更してはならず、
他の会員の個人情報も変更できないようにすべきです。この問題を修正するため
に、
2
つのプロキシを作成します。
1
つは自分の
Person
オブジェクトにアクセス
するためのプロキシ、もう
1
つは別の会員の
Person
オブジェクトにアクセスする
ためのプロキシです。このようにすると、プロキシがそれぞれの状況で実行でき
るリクエストを制御できます。
このプロキシを作成するために、
440
ページで紹介した
Java API
の動的プロキ
シを使います。
Java
が
2
つのプロキシを作成してくれま
す。あとは、プロキシでメソッドが呼び出されたときに
実行すべきことを知っているハンドラを用意するだけで
す。
プロキシの全体像
全体像：
Person
用の動的プロキシの作成
<<interface>>
Subject
request()
RealSubject
request()
Proxy
request()
<<interface>>
InvocationHandler
invoke()
InvocationHandler
2
つの
InvocationHandler
を作成する。
InvocationHandler
はプロキシの振る舞いを実装し
ます。すぐにわかるように、
Java
が実際のプロキシ
クラスとオブジェクトを作成します。自分では、プ
ロキシでメソッドが呼び出されたときに実行すべき
ことを知っているハンドラを用意するだけです。
動的プロキシを作成するコードを書く。
プロキシクラスを作成してインスタンス化する少量 ...
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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.