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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309
8
章
Template Method
パターン
AbstractList
を使った独自のリスト
Template Method
探検の最後の訪問地は、
AbstractList
です。
ArrayList
や
LinkedList
などの
Java
リストコレクションは、
AbstractList
を拡張しています。
AbstractList
は、リストの振る
舞いの基本的な実装を用意します。独自のリスト（例えば、
String
だけを含むリスト）を作成したいのなら、
AbstractList
を
拡張して基本的なリストの振る舞いを取得すればよいのです。
AbstractList
には、テンプレートメソッド
subList()
がありま
す。
subList()
は、
2
つの抽象メソッド
get()
と
size()
に依存してい
ます。そのため、
AbstractList
を拡張して独自の独自のリストを
作成するときには、この
2
つのメソッドの実装を用意します。
これは
String
オブジェクトだけを含み、基盤となる実装に配
列を使う独自のリストの実装です。
AbstractList
を拡張して独自のリ
ストを作成します。
subList()
get(int)
size()
iterator()
hashCode()
//
他 の メ ソ ッド
AbstractList
get(int)
size()
MyList
get(3);
size();
public class MyStringList extends AbstractList<String> ...
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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.