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 Java programmers to use identifiers in their
programs that are written in their native languages.
A Java letter is a character for which the method
Character.isJavaLetter (�20.5.17) returns true. A Java letter-or-
digit is a character for which the method
Character.isJavaLetterOrDigit (�20.5.18) returns true.
The Java letters include uppercase and lowercase ASCII Latin
letters A-Z (\u0041-\u005a), and a-z (\u0061-\u007a), and, for
historical reasons, the ASCII underscore (_, or \u005f) and
dollar sign ($, or \u0024). The $ character should be used only
in mechanically generated Java code or, rarely, to access
preexisting names on legacy systems.
The Java digits include the ASCII digits 0-9 (\u0030-\u0039).
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