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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363
9
章
Iterator
パターンと
Composite
パターン
getName()
getDescription()
getPrice()
isVegetarian()
print()
add(MenuComponent)
remove(MenuComponent)
getChild(int)
MenuComponent
getName()
getDescription()
getPrice()
isVegetarian()
print()
MenuItem
Waitress
getName()
getDescription()
print()
add(MenuComponent)
remove(MenuComponent)
getChild(int)
Menu
menuComponents
Composite
を使ってメニューを設計する
それでは、どのように
Composite
パターンをメニューに適用するのでしょうか？
まず、コンポー
ネントインタフェースを作成する必要があります。このインタフェースはメニューとメニュー項目の
両方にとっての共通インタフェースとして機能し、すべてを統一的に扱うことができます。つまり、
メニューやメニュー項目で同じメソッドを呼び出せるのです。
メニュー項目やメニューに対して呼び出しても意味がないメソッドもありますが、この問題につ
いてはこの後対応します。ここでは、メニューを
Composite
パターン構造に適合させたかを確認しま
しょう。
MenuComponent
は、
MenuItem ...
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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.