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.
you are here
419
10
章
State
パターン
デザインツールボックスの
ためのツール
これでこの
10
章も終わりです。ここでは、どんな就職面接
でも難なくパスできるほどのパターンが手に入りました！
■
State
パターンでは、オブ
ジェクトがその内部状態に基
づいたさまざまな振る舞いを
持てる。
■
手続き型の状態マシンとは異
なり、
State
パターンは状態
を本格的なクラスとして表現
する。
■
Context
は、
Context
を 構
成している現在の状態オブ
ジェクトに振る舞いを委譲し
てその振る舞いを実行する。
■
状態をクラスにカプセル化す
ることで、変更が必要になっ
たときに、その変更を局所化
できる。
■
State
パターンと
Strategy
パターンのクラス図は同じだ
が、目的が異なる。
■
通常、
Strategy
パターンは、
振る舞いやアルゴリズムに基
づいて
Context
クラスを構
成する。
■
State
パターンでは、
Context
の状態が変わると
Context
は そ の 振 る舞い を
変更できる。
■
状態遷移は
State
クラスか
Context
クラスで制御できる。
■
State
パターンを使うと、通
常は設計内のクラスの数が多
くなる。
■
State
クラスは
Context
イン
スタンス間で共有できる。
420
10
章
エクササイズの答え
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当たり
2 つのガム
ボールを
出す
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なし ...
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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.