April 2022
Beginner to intermediate
344 pages
9h 32m
Japanese
Content preview from はじめての設計をやり抜くための本 第2版 概念モデリングからアプリケーション、データベース、アーキテクチャ設計、アジャイル開発まで
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066
導
入
編
1
設
計
編
ア
キ
テ
ク
チ
ャ
編
2
3
4
5
6
7
2
スで実装の定義を置き換えることです。これをオーバーライドと呼びます。
もう1つは、スーパークラスが持っていないメソッドを新たに定義すること
です。まったく新しいメソッドを追加することもできますし、スーパークラ
スと同じメソッド名で引数だけを変えることもできます。これをオーバー
ロードと呼びます。オーバーロードは、スーパークラスのメソッドのバリ
エーションを増やす方法です。
図 2-18 の例では、商品クラスを継承して割引商品クラスを定義していま
す。割引商品クラスは、商品価格の計算時に割引金額を受け取り、それを割
り引いた金額を返すように拡張されています。また、割引商品クラスは、割
引期間の間だけ割引を実行します。割引期間外であれば商品価格の計算で割
引をしません。「商品価格を取得する」メソッドは、オーバーロードしてい
ます。
Item
+ getSellPrice()
- name
- description
- price
- tax
DiscountItem
- term
- discountPrice
+ getSellPrice()
+ getSellPrice(discountPrice)
+ setTerm(term)
+ setDiscountPrice(discountPrice)
図
2
-
18
：継承の例
067
導
入
編
1
設
計
編
ア
キ
テ
ク
チ
ャ
編
2
3
4
5
6
7
2
継承は、処理の共通化・再利用の手法です。サブクラスであるDiscountItem
はメソッドを実装するにあたり、スーパークラスのメソッドを呼び出すこと ...
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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.