An identifier is an unlimited-length sequence of Java letters and Java digits, the first of which must be a Java letter.
A "Java letter" is a character for which the method Character.isJavaIdentifierStart(int) returns true.
Letters and digits may be drawn from the entire Unicode character set, which supports most writing scripts in use in the world today, including the large sets for Chinese, Japanese, and Korean. This allows programmers to use identifiers in their programs that are written in their native languages.
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