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
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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.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.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.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.
you are here
353
9
章
Iterator
パターンと
Composite
パターン
イテレータとコレクション
Java
コレクションフレームワークに入っている
2
つのクラスを使ってきました。この
「フレームワーク」は、これまで使ってきた
ArrayList
や、
Vector
、
LinkedList
、
Stack
、
PriorityQueue
などの他の多くのクラスを含む、一連のクラスとインタフェースにすぎ
ません。これらのクラスは、オブジェクトのグループを操作する便利なメソッドを多
数持つ
java.util.Collection
インタフェースを実装しています。
このインタフェースを簡単に調べてみましょう。
add()
addAll()
clear()
contains()
containsAll()
equals()
hashCode()
isEmpty()
iterator()
remove()
removeAll()
retainAll()
size()
toArray()
<<interface>>
Collection
このように、さまざまな便利なメ
ソッドがあります。コレクションの
実装方法を知らなくても、コレク
ションに対する要素の追加や削除が
できます。
これはおなじみの
iterator()
メソッ
ドです。このメソッドを使うと、
Collection
インタフェースを実装す
るあらゆるクラス向けのイテレータ
を取得できます。
他の便利なメソッドとしては、要素
数を取得する
size()
や、コレクショ
ンを配列に変換する
toArray() ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.