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https://stackoverflow.com/questions/1941613/how-does-java-16-bit-chars-support-unicode
Java Strings are UTF-16 (big endian), so a Unicode code point can be one or two characters. Under this encoding, Java can represent the code point U+1D50A (MATHEMATICAL FRAKTUR CAPITAL G) using the chars 0xD835 0xDD0A (String literal "\uD835\uDD0A"). The Character class provides methods for converting to/from code points.
https://docs.oracle.com/javase/tutorial/essential/regex/unicode.html
This Java tutorial describes exceptions, basic input/output, concurrency, regular expressions, and the platform environment ... Unicode Support. As of the JDK 7 release, Regular Expression pattern matching has expanded functionality to support Unicode 6.0. ... Alternatively, you can prefix the script name with the string Is, such as \p{IsHiragana}.
https://community.oracle.com/thread/1288682
Jun 19, 2002 · Java's native encoding is UTF-16; each character is either 1 or 2 char values. A char does not always equal a complete character...since a complete Unicode UTF-16 character can be either 1 or 2 char values. Unicode characters that require 2 char values use surrogate pairs; each value in the surrogate pair is a char value. Regards, John O'Conner
http://tutorials.jenkov.com/java-internationalization/unicode.html
Internally in Java all strings are kept in unicode. Since not all text received from users or the outside world is in unicode, your application may have to convert from non-unicode to unicode.
https://www.answers.com/Q/Why_does_java_use_unicode
Apr 23, 2013 · A character is a single symbol - letter, digit, or other special symbol. In Java, characters (and Strings, as groups of characters) are Unicode characters; unlike some older systems, that only allow 256 different symbols because the use a single-byte representation, this system allows over a million different symbols.
https://docs.oracle.com/javase/tutorial/i18n/text/unicode.html
Because 16-bit encoding supports 2 16 (65,536) characters, which is insufficient to define all characters in use throughout the world, the Unicode standard was extended to 0x10FFFF, which supports over one million characters. The definition of a character in the Java programming language could not be changed from 16 bits to 32 bits without causing millions of Java applications to no longer run properly.
https://www.quora.com/Why-do-java-use-Unicode-system
Java is new enough it doesn’t have an old code base of 8-byte characters o support. Unicode is the logical choice for newer languages such as Java, C#, and Swift. Let me tell you, as someone who has to support older programs that still use 8-bit ASCII characters across the globe Unicode would be …
https://coderanch.com/t/410974/java/java-ASCII-Unicode
Java is Unicode. But the first set of characters in Unicode are ASCII, specifically US-ASCII. So since ASCII is a subset of Unicode, its trivial to do work in ASCII within Java. But writing ASCII only code in java is bad form unless its just quick and dirty.
https://www.thoughtco.com/what-is-unicode-2034272
Jan 24, 2019 · Java was created around the time when the Unicode standard had values defined for a much smaller set of characters. Back then, it was felt that 16-bits would be more than enough to encode all the characters that would ever be needed. With that in mind, Java was designed to use UTF-16.
https://softwareengineering.stackexchange.com/questions/174947/why-does-java-use-utf-16-for-internal-string-representation
Depending upon how a string is generated, UTF-8, UTF-16, or even UTF-32 may be the most efficient way of storing it. I don't think there's any particularly efficient way for an "ordinary" class String to handle multiple formats, but a "special" type with JVM support could. – supercat Feb 26 '14 at 23:35
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