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The Java® Language Specification, Java SE 7 Edition, Fourth Edition by Alex Buckley, Gilad Bracha, Guy Steele, Bill Joy, James Gosling

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3.1. Unicode

Programs are written using the Unicode character set. Information about this character set and its associated character encodings may be found at http://www.unicode.org/.

The Java SE platform tracks the Unicode specification as it evolves. The precise version of Unicode used by a given release is specified in the documentation of the class Character.

Versions of the Java programming language prior to 1.1 used Unicode version 1.1.5. Upgrades to newer versions of the Unicode Standard occurred in JDK 1.1 (to Unicode 2.0), JDK 1.1.7 (to Unicode 2.1), Java SE 1.4 (to Unicode 3.0), and Java SE 5.0 (to Unicode 4.0).

The Unicode standard was originally designed as a fixed-width 16-bit character encoding. It has since been changed to allow ...

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