February 2016
Intermediate to advanced
256 pages
4h 7m
Japanese
Content preview from 初めてのAndroid 第4版
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付録AJavaとAndroid、言語とAPIの違い
AndroidプログラムはJava 6 SE（Standard Edition）ライブラリAPIを使って大部分がJava言語で書かれる。大部分と言ったのは両者の間に若干の違いがあるからだ。本付録では通常のJavaとAndroidで使われるJavaの間の違いにスポットライトを当てる。ART（Android 5.0以上で使われているランタイムシステム）とDalvik（Android 5.0よりも前に使われていたランタイムシステム）は同じ制限を抱えている。
他のプラットフォームですでにJava開発に熟達している読者は、じっくり読んで、どの部分を"忘れなければならないか"を把握しておこう。
A.1 言語
Androidは標準Javaコンパイラを使ってソースコードを通常のバイトコードにコンパイルし、さらにこのバイトコードを実行すべき命令に変換する。そのため、サブセットではなくほぼ完全なJava言語をサポートする。ストックコンパイラとバイトコードを使っているので、アプリケーションで使いたいライブラリのソースコードを持つ必要さえない。
A.1.1 言語レベル
Android StudioはJava 6 SEまたはそれ以前に対して互換性を持つコードをサポートし、オプションでJava 7の一部もサポートしている。現時点ではJava 8の機能はサポートしていない。
Java 7の言語機能を有効にするには、Gradleビルドファイルに次の行を追加する必要がある。
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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.
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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.