identifier

identifier 
      ::= "a..z,$,_" { "a..z,$,_,0..9,unicode character over 00C0" } 

This rule is called by

-> class_declaration
-> class_name
-> constructor_declaration
-> expression
-> interface_declaration
-> interface_name
-> method_declaration
-> package_name
-> parameter
-> statement
-> variable_declarator

Semantic, examples ...

coming soon ...