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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343
9
章
Iterator
パターンと
Composite
パターン
Java
の
Iterable
インタフェースとの出会い
Java
の Iteratorインタフェースのことはもうよく理解していますよ
ね。さらに、知っておくべきインタフェースがもう
1
つあります。
Iterableです。
Iterable
インタフェースは、
Java
のすべてのコレクショ
ン型で実装されています。実は、
ArrayList
を使っているコードではす
でにこのインタフェースを使っています。
Iterable
インタフェースを確
認してみましょう。
iterator()
+ forEach()
+ spliterator()
<<interface>>
Iterable
add()
addAll()
clear()
contains()
containsAll()
equals()
hashCode()
isEmpty()
iterator()
remove()
removeAll()
retainAll()
size()
toArray()
<<interface>>
Collection
next
()
hasNext()
+ remove()
<<interface>>
Iterator
Iterable
インタフェー
スには、
Iterator
インタ
フェースを実装するイテ
レータを返す
iterator()
メソッドがあります。
ArrayList
などのすべてのコレ
クションクラスは、
Collection
インタフェースを実装します。
Collection
インタフェースは ...
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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.