Illegal identifier: starts with a digit : identifier « Java Source And Data Type « SCJP

1.6.11.Illegal identifier: starts with a digit

public class MainClass{

   int 3_intValue5;  // error

}

Syntax error on token "3", delete this token

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

All other trademarks are property of their respective owners.