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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329
9
章
Iterator
パターンと
Composite
パターン
public class DinerMenu {
static final int MAX_ITEMS = 6;
int numberOfItems = 0;
MenuItem[] menuItems;
//
ここにコンストラクタが入ります
//
ここに
addItem
が入ります
public MenuItem[] getMenuItems() {
return menuItems;
}
public Iterator createIterator() {
return new DinerMenuIterator(menuItems);
}
//
ここに他のメニューメソッドが入ります
}
イテレータを使って
DinerMenu
を書き直す
これでイテレータが手に入りました。次にイテレータを
DinerMenu
に組み込
みます。そのためには、
DinerMenuIterator
を作成する
1
つのメソッドを追加し、
DinerMenuIterator
をクライアントに返すだけでいいのです。
もはや
getMenuItems()
メソッドは必要ありませ
ん。実際、このメソッドは内部実装を公開してしま
うので不要です！
これは
createIterator()
メソッドです。
このメソッドは、
menuItems
配列か
ら
DinerMenuIterator
を生成してク
ライアントに返します。
Iterator
インタフェースを返しています。 ...
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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.