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SCJP » Java Source And Data Type » identifier 
1.6.identifier
1.6.1.Java Identifiers
1.6.2.Java names always considers case.
1.6.3.legal identifiers:
1.6.4.Java Keywords and Reserved Words
1.6.5.An identifier is a word used by a programmer to name a variable, method, class, or label.
1.6.6.Keywords and reserved words may not be used as identifiers.
1.6.7.An identifier must begin with a letter, a dollar sign ($), or an underscore (_)
1.6.8.Identifier's Subsequent characters may be letters, dollar signs, underscores, or digits.
1.6.9.The only nonalphabetic characters allowed to start a name are $ and _(underscore).
1.6.10.Embedded keywords are ok
1.6.11.Illegal identifier: starts with a digit
1.6.12.Illegal Identifier: bad 1st char
1.6.13.The following are invalid Java identifiers:
1.6.14.A simple identifier followed by an expression
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